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DROP TRIGGER
Name
DROP TRIGGER—removeatrigger
Synopsis
DROP TRIGGER [ IF EXISTS ]
name
ON
table_name
[ CASCADE | RESTRICT ]
Description
DROP TRIGGER
removesan existingtriggerdefinition.To executethiscommand,the currentuser
mustbetheownerofthetableforwhichthetriggerisdefined.
Parameters
IF EXISTS
Donotthrowanerrorifthetriggerdoesnotexist.Anoticeisissuedinthiscase.
name
Thenameofthetriggertoremove.
table_name
Thename(optionallyschema-qualified)ofthetableforwhichthetriggerisdefined.
CASCADE
Automaticallydropobjectsthatdependonthetrigger.
RESTRICT
Refusetodropthetriggerifanyobjectsdependonit.Thisisthedefault.
Examples
Destroythetrigger
if_dist_exists
onthetable
films
:
DROP TRIGGER if_dist_exists ON films;
Compatibility
The
DROP TRIGGER
statement in PostgreSQL isincompatiblewiththeSQL standard.IntheSQL
standard,triggernamesarenotlocaltotables,sothecommandissimply
DROP TRIGGER
name
.
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DROPTRIGGER
See Also
CREATETRIGGER
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DROP TYPE
Name
DROP TYPE—removeadatatype
Synopsis
DROP TYPE [ IF EXISTS ]
name
[, ...] [ CASCADE | RESTRICT ]
Description
DROP TYPE
removesauser-defineddatatype.Onlytheownerofatypecanremoveit.
Parameters
IF EXISTS
Donotthrowanerrorifthetypedoesnotexist.Anoticeisissuedinthiscase.
name
Thename(optionallyschema-qualified)ofthedatatypetoremove.
CASCADE
Automaticallydropobjectsthatdependonthetype(suchastablecolumns,functions,operators).
RESTRICT
Refusetodropthetypeifanyobjectsdependonit.Thisisthedefault.
Examples
Toremovethedatatype
box
:
DROP TYPE box;
Compatibility
This command is similarto the corresponding command in the SQL standard,apart fromthe
IF
EXISTS
option,whichisaPostgreSQLextension.Butnotethatmuchofthe
CREATE TYPE
command
andthedatatypeextensionmechanismsinPostgreSQLdifferfromtheSQLstandard.
See Also
ALTERTYPE,CREATETYPE
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DROP USER
Name
DROP USER—removeadatabaserole
Synopsis
DROP USER [ IF EXISTS ]
name
[, ...]
Description
DROP USER
issimplyanalternatespellingofDROPROLE.
Compatibility
The
DROP USER
statementis a PostgreSQL extension.TheSQL standardleaves the definition of
userstotheimplementation.
See Also
DROPROLE
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DROP USER MAPPING
Name
DROP USER MAPPING—removeausermappingforaforeignserver
Synopsis
DROP USER MAPPING [ IF EXISTS ] FOR {
user_name
| USER | CURRENT_USER | PUBLIC } SERVER
server_name
Description
DROP USER MAPPING
removesanexistingusermappingfromforeignserver.
Theownerofaforeignservercandropusermappingsforthatserverforanyuser.Also,ausercan
dropausermappingforhisownusernameif
USAGE
privilegeontheserverhasbeengrantedtothe
user.
Parameters
IF EXISTS
Donotthrowanerroriftheusermappingdoesnotexist.Anoticeisissuedinthiscase.
user_name
User name of the mapping.
CURRENT_USER
and
USER
match the name of the current user.
PUBLIC
isusedtomatchallpresentandfutureusernamesinthesystem.
server_name
Servernameoftheusermapping.
Examples
Dropausermapping
bob
,server
foo
ifitexists:
DROP USER MAPPING IF EXISTS FOR bob SERVER foo;
Compatibility
DROP USER MAPPING
conformstoISO/IEC9075-9(SQL/MED).The
IF EXISTS
clauseisaPost-
greSQLextension.
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DROPUSERMAPPING
See Also
CREATEUSERMAPPING,ALTERUSERMAPPING
1513
DROP VIEW
Name
DROP VIEW—removeaview
Synopsis
DROP VIEW [ IF EXISTS ]
name
[, ...] [ CASCADE | RESTRICT ]
Description
DROP VIEW
dropsanexistingview.Toexecutethiscommandyoumustbetheowneroftheview.
Parameters
IF EXISTS
Donotthrowanerroriftheviewdoesnotexist.Anoticeisissuedinthiscase.
name
Thename(optionallyschema-qualified)oftheviewtoremove.
CASCADE
Automaticallydropobjectsthatdependontheview(suchasotherviews).
RESTRICT
Refusetodroptheviewifanyobjectsdependonit.Thisisthedefault.
Examples
Thiscommandwillremovetheviewcalled
kinds
:
DROP VIEW kinds;
Compatibility
Thiscommandconformstothe SQL standard,exceptthatthestandardonlyallows oneviewtobe
droppedpercommand,andapartfromthe
IF EXISTS
option,whichisaPostgreSQLextension.
See Also
ALTERVIEW,CREATEVIEW
1514
END
Name
END—committhecurrenttransaction
Synopsis
END [ WORK | TRANSACTION ]
Description
END
commitsthecurrenttransaction.Allchangesmadebythetransactionbecomevisibletoothers
andareguaranteedtobedurableifacrashoccurs.ThiscommandisaPostgreSQLextensionthatis
equivalenttoCOMMIT.
Parameters
WORK
TRANSACTION
Optionalkeywords.Theyhavenoeffect.
Notes
UseROLLBACKtoabortatransaction.
Issuing
END
whennotinsideatransactiondoesnoharm,butitwillprovokeawarningmessage.
Examples
Tocommitthecurrenttransactionandmakeallchangespermanent:
END;
Compatibility
END
isaPostgreSQLextensionthatprovidesfunctionalityequivalenttoCOMMIT,whichisspecified
intheSQLstandard.
See Also
BEGIN,COMMIT,ROLLBACK
1515
EXECUTE
Name
EXECUTE—executeapreparedstatement
Synopsis
EXECUTE
name
[ (
parameter
[, ...] ) ]
Description
EXECUTE
is usedtoexecuteapreviously prepared statement.Sincepreparedstatements onlyexist
forthedurationofasession,thepreparedstatementmusthavebeencreatedbya
PREPARE
statement
executedearlierinthecurrentsession.
Ifthe
PREPARE
statementthatcreatedthestatementspecifiedsomeparameters,acompatiblesetof
parametersmustbepassedtothe
EXECUTE
statement,orelsean erroris raised.Note that (unlike
functions)preparedstatementsarenotoverloadedbasedonthetypeornumberoftheirparameters;
thenameofapreparedstatementmustbeuniquewithinadatabasesession.
Formoreinformationonthecreationandusageofpreparedstatements,seePREPARE.
Parameters
name
Thenameofthepreparedstatementtoexecute.
parameter
Theactualvalueofaparametertothepreparedstatement.Thismustbeanexpressionyielding
avalue that is compatible with the data type of this parameter,as was determinedwhen the
preparedstatementwascreated.
Outputs
Thecommandtagreturnedby
EXECUTE
isthatofthepreparedstatement,andnot
EXECUTE
.
Examples
ExamplesaregivenintheExamplessectionofthePREPAREdocumentation.
Compatibility
The SQL standard includes an
EXECUTE
statement,but it is only foruse in embeddedSQL.This
versionofthe
EXECUTE
statementalsousesasomewhatdifferentsyntax.
1516
EXECUTE
See Also
DEALLOCATE,PREPARE
1517
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