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PostgreSQL 9.4.7 Documentation
ThePostgreSQL GlobalDevelopmentGroup
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PostgreSQL9.4.7Documentation
byThePostgreSQLGlobalDevelopmentGroup
Copyright©1996-2016ThePostgreSQLGlobalDevelopmentGroup
LegalNotice
PostgreSQLisCopyright©1996-2016bythePostgreSQLGlobalDevelopmentGroup.
Postgres95isCopyright©1994-5bytheRegentsoftheUniversityofCalifornia.
Permissiontouse,copy,modify,anddistributethissoftwareandits documentation forany purpose,withoutfee,and withoutawritten
agreementisherebygranted,providedthattheabovecopyrightnoticeandthisparagraphandthefollowingtwoparagraphsappearinall
copies.
INNOEVENT SHALL THEUNIVERSITYOFCALIFORNIABELIABLE TOANYPARTYFORDIRECT,INDIRECT,SPECIAL,
INCIDENTAL,ORCONSEQUENTIALDAMAGES,INCLUDINGLOSTPROFITS,ARISINGOUTOFTHEUSEOFTHISSOFTWARE
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SUCHDAMAGE.
THEUNIVERSITYOFCALIFORNIASPECIFICALLYDISCLAIMSANYWARRANTIES,INCLUDING,BUTNOT LIMITEDTO,
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MAINTENANCE,SUPPORT,UPDATES,ENHANCEMENTS,ORMODIFICATIONS.
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Table ofContents
Preface.............................................................................................................................................lxiv
1.WhatisPostgreSQL?..........................................................................................................lxiv
2.ABriefHistoryofPostgreSQL............................................................................................lxv
2.1.TheBerkeleyPOSTGRESProject..........................................................................lxv
2.2.Postgres95................................................................................................................lxv
2.3.PostgreSQL.............................................................................................................lxvi
3.Conventions.........................................................................................................................lxvi
4.FurtherInformation............................................................................................................lxvii
5.BugReportingGuidelines..................................................................................................lxvii
5.1.IdentifyingBugs...................................................................................................lxviii
5.2.WhattoReport.....................................................................................................lxviii
5.3.WheretoReportBugs.............................................................................................lxx
I.Tutorial.............................................................................................................................................1
1.GettingStarted........................................................................................................................1
1.1.Installation..................................................................................................................1
1.2.ArchitecturalFundamentals........................................................................................1
1.3.CreatingaDatabase....................................................................................................2
1.4.AccessingaDatabase.................................................................................................3
2.TheSQLLanguage.................................................................................................................5
2.1.Introduction................................................................................................................5
2.2.Concepts.....................................................................................................................5
2.3.CreatingaNewTable.................................................................................................5
2.4.PopulatingaTableWithRows...................................................................................6
2.5.QueryingaTable........................................................................................................7
2.6.JoinsBetweenTables..................................................................................................9
2.7.AggregateFunctions.................................................................................................11
2.8.Updates.....................................................................................................................12
2.9.Deletions...................................................................................................................13
3.AdvancedFeatures................................................................................................................14
3.1.Introduction..............................................................................................................14
3.2.Views........................................................................................................................14
3.3.ForeignKeys.............................................................................................................14
3.4.Transactions..............................................................................................................15
3.5.WindowFunctions....................................................................................................17
3.6.Inheritance................................................................................................................20
3.7.Conclusion................................................................................................................21
II.TheSQLLanguage......................................................................................................................22
4.SQLSyntax...........................................................................................................................24
4.1.LexicalStructure.......................................................................................................24
4.1.1.IdentifiersandKeyWords............................................................................24
4.1.2.Constants......................................................................................................26
4.1.2.1.StringConstants..............................................................................26
4.1.2.2.StringConstantswithC-styleEscapes............................................26
4.1.2.3.StringConstantswithUnicodeEscapes..........................................28
4.1.2.4.Dollar-quotedStringConstants.......................................................28
4.1.2.5.Bit-stringConstants.........................................................................29
4.1.2.6.NumericConstants..........................................................................29
4.1.2.7.ConstantsofOtherTypes................................................................30
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4.1.3.Operators......................................................................................................31
4.1.4.SpecialCharacters........................................................................................31
4.1.5.Comments....................................................................................................32
4.1.6.OperatorPrecedence....................................................................................32
4.2.ValueExpressions.....................................................................................................33
4.2.1.ColumnReferences......................................................................................34
4.2.2.PositionalParameters...................................................................................34
4.2.3.Subscripts.....................................................................................................35
4.2.4.FieldSelection.............................................................................................35
4.2.5.OperatorInvocations....................................................................................36
4.2.6.FunctionCalls..............................................................................................36
4.2.7.AggregateExpressions.................................................................................36
4.2.8.WindowFunctionCalls................................................................................39
4.2.9.TypeCasts....................................................................................................40
4.2.10.CollationExpressions................................................................................41
4.2.11.ScalarSubqueries.......................................................................................42
4.2.12.ArrayConstructors.....................................................................................42
4.2.13.RowConstructors.......................................................................................44
4.2.14.ExpressionEvaluationRules.....................................................................45
4.3.CallingFunctions......................................................................................................46
4.3.1.UsingPositionalNotation............................................................................47
4.3.2.UsingNamedNotation................................................................................47
4.3.3.UsingMixedNotation..................................................................................48
5.DataDefinition......................................................................................................................49
5.1.TableBasics..............................................................................................................49
5.2.DefaultValues..........................................................................................................50
5.3.Constraints................................................................................................................51
5.3.1.CheckConstraints........................................................................................51
5.3.2.Not-NullConstraints....................................................................................53
5.3.3.UniqueConstraints.......................................................................................54
5.3.4.PrimaryKeys................................................................................................55
5.3.5.ForeignKeys................................................................................................55
5.3.6.ExclusionConstraints..................................................................................58
5.4.SystemColumns.......................................................................................................58
5.5.ModifyingTables......................................................................................................60
5.5.1.AddingaColumn.........................................................................................60
5.5.2.RemovingaColumn....................................................................................61
5.5.3.AddingaConstraint.....................................................................................61
5.5.4.RemovingaConstraint................................................................................61
5.5.5.ChangingaColumn’sDefaultValue............................................................62
5.5.6.ChangingaColumn’sDataType.................................................................62
5.5.7.RenamingaColumn....................................................................................62
5.5.8.RenamingaTable........................................................................................62
5.6.Privileges..................................................................................................................63
5.7.Schemas....................................................................................................................63
5.7.1.CreatingaSchema.......................................................................................64
5.7.2.ThePublicSchema......................................................................................65
5.7.3.TheSchemaSearchPath..............................................................................65
5.7.4.SchemasandPrivileges................................................................................66
5.7.5.TheSystemCatalogSchema.......................................................................67
5.7.6.UsagePatterns..............................................................................................67
5.7.7.Portability.....................................................................................................67
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5.8.Inheritance................................................................................................................68
5.8.1.Caveats.........................................................................................................70
5.9.Partitioning...............................................................................................................71
5.9.1.Overview......................................................................................................71
5.9.2.ImplementingPartitioning...........................................................................72
5.9.3.ManagingPartitions.....................................................................................75
5.9.4.PartitioningandConstraintExclusion.........................................................76
5.9.5.AlternativePartitioningMethods.................................................................77
5.9.6.Caveats.........................................................................................................77
5.10.ForeignData...........................................................................................................78
5.11.OtherDatabaseObjects..........................................................................................79
5.12.DependencyTracking.............................................................................................79
6.DataManipulation.................................................................................................................81
6.1.InsertingData...........................................................................................................81
6.2.UpdatingData...........................................................................................................82
6.3.DeletingData............................................................................................................83
7.Queries..................................................................................................................................84
7.1.Overview..................................................................................................................84
7.2.TableExpressions.....................................................................................................84
7.2.1.The
FROM
Clause..........................................................................................85
7.2.1.1.JoinedTables...................................................................................85
7.2.1.2.TableandColumnAliases...............................................................89
7.2.1.3.Subqueries.......................................................................................90
7.2.1.4.TableFunctions...............................................................................90
7.2.1.5.
LATERAL
Subqueries.......................................................................92
7.2.2.The
WHERE
Clause........................................................................................93
7.2.3.The
GROUP BY
and
HAVING
Clauses...........................................................94
7.2.4.WindowFunctionProcessing......................................................................96
7.3.SelectLists................................................................................................................96
7.3.1.Select-ListItems..........................................................................................96
7.3.2.ColumnLabels.............................................................................................97
7.3.3.
DISTINCT
....................................................................................................97
7.4.CombiningQueries...................................................................................................98
7.5.SortingRows............................................................................................................99
7.6.
LIMIT
and
OFFSET
.................................................................................................100
7.7.
VALUES
Lists..........................................................................................................100
7.8.
WITH
Queries(CommonTableExpressions).........................................................101
7.8.1.
SELECT
in
WITH
.........................................................................................101
7.8.2.Data-ModifyingStatementsin
WITH
.........................................................105
8.DataTypes...........................................................................................................................107
8.1.NumericTypes........................................................................................................108
8.1.1.IntegerTypes..............................................................................................109
8.1.2.ArbitraryPrecisionNumbers.....................................................................109
8.1.3.Floating-PointTypes..................................................................................111
8.1.4.SerialTypes................................................................................................112
8.2.MonetaryTypes......................................................................................................113
8.3.CharacterTypes......................................................................................................113
8.4.BinaryDataTypes..................................................................................................115
8.4.1.
bytea
HexFormat.....................................................................................116
8.4.2.
bytea
EscapeFormat................................................................................116
8.5.Date/TimeTypes.....................................................................................................118
8.5.1.Date/TimeInput.........................................................................................119
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8.5.1.1.Dates..............................................................................................120
8.5.1.2.Times.............................................................................................120
8.5.1.3.TimeStamps..................................................................................121
8.5.1.4.SpecialValues...............................................................................122
8.5.2.Date/TimeOutput......................................................................................123
8.5.3.TimeZones................................................................................................124
8.5.4.IntervalInput..............................................................................................125
8.5.5.IntervalOutput...........................................................................................127
8.6.BooleanType..........................................................................................................128
8.7.EnumeratedTypes..................................................................................................129
8.7.1.DeclarationofEnumeratedTypes..............................................................129
8.7.2.Ordering.....................................................................................................129
8.7.3.TypeSafety................................................................................................130
8.7.4.ImplementationDetails..............................................................................131
8.8.GeometricTypes.....................................................................................................131
8.8.1.Points.........................................................................................................131
8.8.2.Lines...........................................................................................................132
8.8.3.LineSegments............................................................................................132
8.8.4.Boxes..........................................................................................................132
8.8.5.Paths...........................................................................................................132
8.8.6.Polygons.....................................................................................................133
8.8.7.Circles........................................................................................................133
8.9.NetworkAddressTypes..........................................................................................133
8.9.1.
inet
...........................................................................................................134
8.9.2.
cidr
...........................................................................................................134
8.9.3.
inet
vs.
cidr
............................................................................................135
8.9.4.
macaddr
....................................................................................................135
8.10.BitStringTypes....................................................................................................135
8.11.TextSearchTypes.................................................................................................136
8.11.1.
tsvector
................................................................................................136
8.11.2.
tsquery
..................................................................................................137
8.12.UUIDType...........................................................................................................139
8.13.XMLType............................................................................................................139
8.13.1.CreatingXMLValues..............................................................................140
8.13.2.EncodingHandling..................................................................................140
8.13.3.AccessingXMLValues............................................................................141
8.14.JSONTypes..........................................................................................................141
8.14.1.JSONInputandOutputSyntax................................................................143
8.14.2.DesigningJSONdocumentseffectively..................................................144
8.14.3.
jsonb
ContainmentandExistence..........................................................144
8.14.4.
jsonb
Indexing........................................................................................146
8.15.Arrays...................................................................................................................148
8.15.1.DeclarationofArrayTypes......................................................................148
8.15.2.ArrayValueInput.....................................................................................149
8.15.3.AccessingArrays.....................................................................................150
8.15.4.ModifyingArrays.....................................................................................152
8.15.5.SearchinginArrays..................................................................................155
8.15.6.ArrayInputandOutputSyntax................................................................156
8.16.CompositeTypes..................................................................................................157
8.16.1.DeclarationofCompositeTypes..............................................................157
8.16.2.CompositeValueInput.............................................................................158
8.16.3.AccessingCompositeTypes....................................................................159
vi
8.16.4.ModifyingCompositeTypes....................................................................160
8.16.5.CompositeTypeInputandOutputSyntax...............................................160
8.17.RangeTypes.........................................................................................................161
8.17.1.Built-inRangeTypes...............................................................................161
8.17.2.Examples..................................................................................................162
8.17.3.InclusiveandExclusiveBounds..............................................................162
8.17.4.Infinite(Unbounded)Ranges...................................................................162
8.17.5.RangeInput/Output..................................................................................163
8.17.6.ConstructingRanges................................................................................163
8.17.7.DiscreteRangeTypes..............................................................................164
8.17.8.DefiningNewRangeTypes.....................................................................164
8.17.9.Indexing...................................................................................................165
8.17.10.ConstraintsonRanges............................................................................166
8.18.ObjectIdentifierTypes.........................................................................................167
8.19.pg_lsnType...........................................................................................................168
8.20.Pseudo-Types........................................................................................................168
9.FunctionsandOperators.....................................................................................................170
9.1.LogicalOperators...................................................................................................170
9.2.ComparisonOperators............................................................................................170
9.3.MathematicalFunctionsandOperators..................................................................172
9.4.StringFunctionsandOperators..............................................................................175
9.4.1.
format
.......................................................................................................189
9.5.BinaryStringFunctionsandOperators..................................................................191
9.6.BitStringFunctionsandOperators........................................................................193
9.7.PatternMatching....................................................................................................194
9.7.1.
LIKE
...........................................................................................................194
9.7.2.
SIMILAR TO
RegularExpressions............................................................195
9.7.3.POSIXRegularExpressions......................................................................196
9.7.3.1.RegularExpressionDetails...........................................................200
9.7.3.2.BracketExpressions......................................................................202
9.7.3.3.RegularExpressionEscapes..........................................................203
9.7.3.4.RegularExpressionMetasyntax....................................................205
9.7.3.5.RegularExpressionMatchingRules.............................................207
9.7.3.6.LimitsandCompatibility..............................................................208
9.7.3.7.BasicRegularExpressions............................................................209
9.8.DataTypeFormattingFunctions............................................................................209
9.9.Date/TimeFunctionsandOperators.......................................................................216
9.9.1.
EXTRACT
,
date_part
...............................................................................221
9.9.2.
date_trunc
..............................................................................................225
9.9.3.
AT TIME ZONE
..........................................................................................226
9.9.4.CurrentDate/Time.....................................................................................226
9.9.5.DelayingExecution....................................................................................228
9.10.EnumSupportFunctions......................................................................................229
9.11.GeometricFunctionsandOperators.....................................................................230
9.12.NetworkAddressFunctionsandOperators..........................................................233
9.13.TextSearchFunctionsandOperators...................................................................236
9.14.XMLFunctions....................................................................................................239
9.14.1.ProducingXMLContent..........................................................................240
9.14.1.1.
xmlcomment
...............................................................................240
9.14.1.2.
xmlconcat
.................................................................................240
9.14.1.3.
xmlelement
...............................................................................241
9.14.1.4.
xmlforest
.................................................................................242
vii
9.14.1.5.
xmlpi
..........................................................................................243
9.14.1.6.
xmlroot
......................................................................................243
9.14.1.7.
xmlagg
........................................................................................243
9.14.2.XMLPredicates.......................................................................................244
9.14.2.1.
IS DOCUMENT
.............................................................................244
9.14.2.2.
XMLEXISTS
.................................................................................244
9.14.2.3.
xml_is_well_formed
..............................................................245
9.14.3.ProcessingXML......................................................................................246
9.14.4.MappingTablestoXML..........................................................................247
9.15.JSONFunctionsandOperators............................................................................250
9.16.SequenceManipulationFunctions.......................................................................256
9.17.ConditionalExpressions.......................................................................................259
9.17.1.
CASE
.........................................................................................................259
9.17.2.
COALESCE
................................................................................................260
9.17.3.
NULLIF
.....................................................................................................261
9.17.4.
GREATEST
and
LEAST
..............................................................................261
9.18.ArrayFunctionsandOperators............................................................................261
9.19.RangeFunctionsandOperators............................................................................264
9.20.AggregateFunctions.............................................................................................266
9.21.WindowFunctions................................................................................................272
9.22.SubqueryExpressions..........................................................................................274
9.22.1.
EXISTS
.....................................................................................................274
9.22.2.
IN
.............................................................................................................275
9.22.3.
NOT IN
.....................................................................................................275
9.22.4.
ANY
/
SOME
.................................................................................................276
9.22.5.
ALL
...........................................................................................................276
9.22.6.Single-rowComparison...........................................................................277
9.23.RowandArrayComparisons...............................................................................277
9.23.1.
IN
.............................................................................................................277
9.23.2.
NOT IN
.....................................................................................................277
9.23.3.
ANY
/
SOME
(array).....................................................................................278
9.23.4.
ALL
(array)...............................................................................................278
9.23.5.RowConstructorComparison..................................................................279
9.23.6.CompositeTypeComparison...................................................................279
9.24.SetReturningFunctions.......................................................................................280
9.25.SystemInformationFunctions.............................................................................283
9.26.SystemAdministrationFunctions........................................................................294
9.26.1.ConfigurationSettingsFunctions.............................................................294
9.26.2.ServerSignalingFunctions......................................................................295
9.26.3.BackupControlFunctions.......................................................................296
9.26.4.RecoveryControlFunctions....................................................................298
9.26.5.SnapshotSynchronizationFunctions.......................................................299
9.26.6.ReplicationFunctions..............................................................................300
9.26.7.DatabaseObjectManagementFunctions.................................................302
9.26.8.GenericFileAccessFunctions.................................................................304
9.26.9.AdvisoryLockFunctions.........................................................................305
9.27.TriggerFunctions.................................................................................................307
9.28.EventTriggerFunctions.......................................................................................308
10.TypeConversion................................................................................................................310
10.1.Overview..............................................................................................................310
10.2.Operators..............................................................................................................311
10.3.Functions..............................................................................................................315
viii
10.4.ValueStorage........................................................................................................318
10.5.
UNION
,
CASE
,andRelatedConstructs..................................................................318
11.Indexes..............................................................................................................................321
11.1.Introduction..........................................................................................................321
11.2.IndexTypes...........................................................................................................322
11.3.MulticolumnIndexes............................................................................................324
11.4.Indexesand
ORDER BY
.........................................................................................325
11.5.CombiningMultipleIndexes................................................................................325
11.6.UniqueIndexes.....................................................................................................326
11.7.IndexesonExpressions........................................................................................327
11.8.PartialIndexes......................................................................................................327
11.9.OperatorClassesandOperatorFamilies..............................................................330
11.10.IndexesandCollations........................................................................................331
11.11.ExaminingIndexUsage......................................................................................332
12.FullTextSearch................................................................................................................334
12.1.Introduction..........................................................................................................334
12.1.1.WhatIsaDocument?...............................................................................335
12.1.2.BasicTextMatching................................................................................335
12.1.3.Configurations..........................................................................................336
12.2.TablesandIndexes................................................................................................337
12.2.1.SearchingaTable.....................................................................................337
12.2.2.CreatingIndexes......................................................................................338
12.3.ControllingTextSearch........................................................................................339
12.3.1.ParsingDocuments..................................................................................339
12.3.2.ParsingQueries........................................................................................340
12.3.3.RankingSearchResults...........................................................................342
12.3.4.HighlightingResults................................................................................344
12.4.AdditionalFeatures..............................................................................................345
12.4.1.ManipulatingDocuments.........................................................................345
12.4.2.ManipulatingQueries...............................................................................346
12.4.2.1.QueryRewriting..........................................................................347
12.4.3.TriggersforAutomaticUpdates..............................................................348
12.4.4.GatheringDocumentStatistics................................................................349
12.5.Parsers...................................................................................................................350
12.6.Dictionaries...........................................................................................................352
12.6.1.StopWords...............................................................................................353
12.6.2.SimpleDictionary....................................................................................354
12.6.3.SynonymDictionary................................................................................355
12.6.4.ThesaurusDictionary...............................................................................356
12.6.4.1.ThesaurusConfiguration.............................................................357
12.6.4.2.ThesaurusExample.....................................................................358
12.6.5.IspellDictionary.......................................................................................359
12.6.6.SnowballDictionary................................................................................360
12.7.ConfigurationExample.........................................................................................360
12.8.TestingandDebuggingTextSearch.....................................................................362
12.8.1.ConfigurationTesting...............................................................................362
12.8.2.ParserTesting...........................................................................................364
12.8.3.DictionaryTesting....................................................................................365
12.9.GiSTandGINIndexTypes..................................................................................366
12.10.psqlSupport........................................................................................................367
12.11.Limitations..........................................................................................................370
12.12.MigrationfromPre-8.3TextSearch...................................................................370
ix
13.ConcurrencyControl.........................................................................................................371
13.1.Introduction..........................................................................................................371
13.2.TransactionIsolation............................................................................................371
13.2.1.ReadCommittedIsolationLevel.............................................................372
13.2.2.RepeatableReadIsolationLevel..............................................................373
13.2.3.SerializableIsolationLevel......................................................................374
13.3.ExplicitLocking...................................................................................................376
13.3.1.Table-levelLocks.....................................................................................377
13.3.2.Row-levelLocks......................................................................................379
13.3.3.Page-levelLocks......................................................................................380
13.3.4.Deadlocks.................................................................................................381
13.3.5.AdvisoryLocks........................................................................................381
13.4.DataConsistencyChecksattheApplicationLevel..............................................382
13.4.1.EnforcingConsistencyWithSerializableTransactions...........................383
13.4.2.EnforcingConsistencyWithExplicitBlockingLocks............................383
13.5.Caveats..................................................................................................................384
13.6.LockingandIndexes.............................................................................................384
14.PerformanceTips..............................................................................................................386
14.1.Using
EXPLAIN
....................................................................................................386
14.1.1.
EXPLAIN
Basics.......................................................................................386
14.1.2.
EXPLAIN ANALYZE
.................................................................................392
14.1.3.Caveats.....................................................................................................395
14.2.StatisticsUsedbythePlanner..............................................................................396
14.3.ControllingthePlannerwithExplicit
JOIN
Clauses............................................397
14.4.PopulatingaDatabase..........................................................................................399
14.4.1.DisableAutocommit................................................................................399
14.4.2.Use
COPY
..................................................................................................400
14.4.3.RemoveIndexes.......................................................................................400
14.4.4.RemoveForeignKeyConstraints............................................................400
14.4.5.Increase
maintenance_work_mem
........................................................400
14.4.6.Increase
checkpoint_segments
..........................................................401
14.4.7.DisableWALArchivalandStreamingReplication.................................401
14.4.8.Run
ANALYZE
Afterwards........................................................................401
14.4.9.SomeNotesAboutpg_dump...................................................................401
14.5.Non-DurableSettings...........................................................................................402
III.ServerAdministration.............................................................................................................404
15.InstallationfromSourceCode..........................................................................................406
15.1.ShortVersion........................................................................................................406
15.2.Requirements........................................................................................................406
15.3.GettingTheSource...............................................................................................408
15.4.InstallationProcedure...........................................................................................408
15.5.Post-InstallationSetup..........................................................................................418
15.5.1.SharedLibraries.......................................................................................418
15.5.2.EnvironmentVariables.............................................................................419
15.6.SupportedPlatforms.............................................................................................420
15.7.Platform-specificNotes........................................................................................420
15.7.1.AIX..........................................................................................................420
15.7.1.1.GCCIssues..................................................................................421
15.7.1.2.Unix-DomainSocketsBroken.....................................................421
15.7.1.3.InternetAddressIssues................................................................421
15.7.1.4.MemoryManagement.................................................................422
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