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Notes
Result
Datatype
Operator
Datatype
floatingpointnumber.Thefractional
partoftheresultrepresents
milliseconds.
Thenumberrepresentsthesecondsto
addtothefirstTime.TheTimewraps
Time
Number
+or-
Time
aroundmidnightsothat11:59PM+
120secondsequals12:01AM.
Thenumberrepresentsthenumberof
daysbetweentwoDateTimesasa
Number
DateTime
minus(-)
DateTime
floatingpointnumber.Thefractional
partoftheresultisthefractionalportion
ofaday,asintodayatnoonminus
todayatmidnightequalsonehalfday.
Thenumberrepresentsthenumberof
daystoaddtothefirstTime.
DateTime
Number
+or-
DateTime
UsingComparisonOperatorswithTimeandTime/DateDataTypes
Thecomparisonoperatorsare=,<>,<,>,<=,>=andshouldallworkasexpectedfortheTimeand
DateTimevalues.ForTimevalues,thesmallestTimeis"12:00:00.000AM"whilethelargestTime
is"11:59:59.999PM".
The"Between"operatorworksasexpectedforDateTimevalues.ForTimevalues,wesupport
wrap-aroundcomparisons.Forexample:
TimeValueBetween"2:00AM"And"10:00PM"istrueiftheTimeValueisgreaterthanorequalto
"2:00AM"andlessthanorequalto"10:00PM"
TimeValueBetween"10:00PM"And"2:00AM"istrueiftheTimeValueisgreaterthanorequalto
"10:00PM"andlessthanorequalto"11:59:59.999"orgreaterthanorequalto"12:00AM"and
lessthanorequalto"2:00AM"
UsingLogicalOperatorswithTimeandTime/DateDataTypes
ATimeorDateTimefieldwithavalueistrue,whilethesamefieldwithanullvalueindicatesfalse.
ThebehaviorofthelogicaloperatorsAnd,Or,andNotshouldfollowlogicallyfromthis.
InterpretingExcelData
UsingExcelyoucanformatnumericcellsasDatesand/orTimes.Exceldeterminesthemeaning
ofthe'm'formatcodeaseither'month'or'minute'basedontherestoftheformatcode.
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Aretreatedas
Fieldsregisteredwith
Datefields
DateformatbutnotTimeformat
Timefields
TimeformatbutnotDateformat
DateTimefields
DateformatandTimeformat
TheDatefieldsinolderMapInfoProfilesaretreatedasDatefieldsuntilyoure-registerthem
tousetheDateTimedatatype.OlderversionsofMapInfoProsupportedDatefieldswiththe
Note:
format'y'(year),'m'(month),or'd'(day).Timefieldswithintheformat'h'(hour)or's'(second)
weretreatedasFloatfields.FieldswithDateandTimeformatcodesweretreatedasaDate
fieldandtheTimeinformationwasignored.
TheHelpSystemcontainstheserelatedtopics:
•EnsuringthatDatesDisplayCorrectlyforExcelforMacintoshTables
•ControllinghowMapInfoProHandlesMixedDataTypeColumns
InterpretingMicrosoftAccessData
AccessdatausesaDateTimetype,butnotseparateDateorTimetypes.MapInfoProregistersthe
AccessDateTimetypefieldsasDateTimefields.
TheDatefieldsinolderMapInfoProfilesaretreatedasDatefieldsuntilyoure-registerthem
tousetheDateTimedatatype.
Note:
WhenyousaveaMapInfotabletoAccessformat,MapInfoProwritesDate,Time,andDateTime
fieldsasAccessDateTimefields.The.tabfileitselfmaintainstheDate,Time,andDateTimetypes
sowhenyoureopenthefile,theDate,Time,orDateTimedatadisplays.Ifyouattempttoopenthese
.tabfilesusinganon-MapInfoapplication,thesefieldsdisplayasDateTime.
InterpretingdBaseData
ThedBaseformatsupportsDatefieldsbutdoesnotexplicitlysupportTimeorDateTimefields.
Therefore,whenyouregisteranexistingdBasefile,therewillbenoTimeorDateTimefields.When
yousaveorexportaMapInfotablewithTimeorDateTimefieldstoadBasefile,TimeandDateTime
fieldsarewrittenoutascharacterfieldsoflength9and17,respectivelysothatthedataiswritten
outinnumericformats.
WhenyousaveaMapInfotabletodBaseformat,the.tabfilemaintainstheTimeandDateTime
typessothatwhenyoureopenitthedatadisplaysaseitherTimeorDateTime.Ifyouattemptto
openthese.tabfilesusinganon-MapInfoapplication,thesefieldsdisplayascharacterfields.
TheHelpSystemcontainstheserelatedtopics:
•TimeandDateTimeDataTypeSupportforRemoteDatabases
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•InterpretingASCIIandCSVData
UsingTemplatesforQueries
QuerytemplatesenableyoutosaveSelectorSQLSelectstatementsastemplatesandreloadthem.
Thissavesyouthetroubleofhavingtorebuildaqueryeachtimeyouwanttouseit.BoththeSelect
andSQLSelectdialogboxeshaveLoadTemplateandSaveTemplateoptionstoenableyoutodo
thiseasily.Querytemplatesareusefulforre-creatingaquerywithanupdatedversionofthetable
usedintheoriginalquery,orforexecutingaqueryonatablethathasthesamefieldsasthetable
onwhichthequerystatementwascreated.
LoadingaTemplate
Youcanloadanysavedquerytemplate.
Toloadaquerytemplate:
1. IntheSelectorSQLSelectdialogboxes,licktheLoadTemplatebutton.TheLoadDialog
FromQueryFiledialogboxdisplays.Itliststhe.QRYfiles.
2. Selectthe.QRYfileyouwanttouse,andclickOpen.TheSelectorSQLSelectdialogbox
displayswiththevaluesfromthetemplatealreadyfilledin.Simplyexecuteyourquerytocreate
thequerybrowser.
RenamingaTemplate
Renameatemplatebyselectingandclickingthetemplatename;enteranewnameupto64
characters.
SavingaTemplate
AfteryouhavefinishedwritingyourSelectorSQLSelectquery,youcansavethequeryasa
template.
Tosaveaqueryasatemplate:
1. IntheSelectorSQLSelectdialogboxes,clicktheSaveTemplatebuttontosavethequeryto
atemplate,orqueryfile.TheSaveDialogtoQueryFiledialogboxdisplays.
2. Givethequeryfileaname,selectafolder,andclickSave.Queryfilesaresavedwitha.QRY
extensionandaresavedinthedirectoryspecifiedintheDirectoriespreferences.
Thequerydoesnotneedtobecompleteorsyntacticallycorrecttosaveittoatemplate.
Note:
DeletingaTemplate
Todeleteatemplate:
•SelectthetemplatenameandpresstheDelete
key.Adialogboxdisplayspromptingyoutoconfirm
orcanceltheoperation.Ifnotemplatesofthegiventypeexist,abuttontorestoreadefaulttemplate
displays.
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DerivingColumns
Aderivedcolumnisacolumninaquerytablewhosecontentsarecreatedbyapplyinganexpression
tothevaluesofcolumnsalreadyexistinginsomebasetable.Intheexampleabove,population
densitywasaderivedcolumn.Bydefault,theSelectColumnsboxcontainsanasterisk(*),indicating
thatallofthecolumnsinthebasetablearetobeincludedinthequerytable.Ifyoudonotwantall
ofthosecolumns,youshoulddeletetheasteriskandlistonlythosecolumnsthatyouwanttouse.
Youarenotlimitedtocreatingonederivedcolumn.Youcancreateasmanyderivedcolumnsas
youwant.Notethatthemorederivedcolumnsyoucreate,thelongeritwilltakeMapInfoProto
executethequery.
Youcanalsocreatederivedcolumnsbasedontheaggregatefunctionscount,sum,avg,wtavg,
max,andmin.Forexample:
•sum(Population)
wouldgiveyouthepopulationfortheentireworld.
•sum(Area(obj),"sqmi")
wouldgiveyoutheareafortheentireworld.
CreatingColumnAliases
WhenMapInfoProcreatesaderivedcolumn,itusestheexpressionitselfasthenameforthat
derivedcolumn,whichcanbeawkward.Youcan,however,specifyanaliasforthecolumn.For
example,thepopulationdensitycolumninourDENSITYBrowserwastitled:
•Population/Area(obj,"sqmi")
Torenamethecolumn,addthenewnametotheSelectColumnsboxwhenlistingthecolumns.
Thealiasmustfollowtheexpression.Itmustalsobeseparatedfromtheexpressionbyablank
spaceandenclosedinquotes.Forexample:
•Country,Population/Area(obj,"sqmi")"POP_DENSITY"
WhenMapInfoProcreatesthetemporaryquerytable,thepopulationdensitycolumnwillnowbe
namedPOP_DENSITY.
Youcanusealiasestorenameanycolumninatable,notjustderivedcolumns.Forexample,if
eachcountryinyourtableisaseparatesalesterritoryforyourcorporation,youmightwanttorename
theCountrycolumn"TERRITORY".Theprocedureisidentical:
•Country"TERRITORY",Population/Area(obj,"sqmi")"POP_DENSITY"
Foranotherexample,seeExample-ComputingTotalWorldPopulationDensityintheHelpSystem.
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AggregatingData
Whenyouaggregatedata,youperformamathematicaloperationonallofacolumn'svaluesinall
oftherecordsinyourtable.UnliketheSelectcommand,whichonlyallowsyoutoperform
mathematicalfunctionsonindividualrecords,SQLallowsyoutoaggregate(orsummarize)data
acrossrecords.
MapInfoProlooksforeachuniquesetofdatavaluesinthespecifiedcolumnorcolumnsandcreates
onerowforeachsuchuniqueset.Whenyouaggregatedata,youneedtospecify:
•Howtherecordswillbegrouped.
•Howthedatawillbeaggregated(summarized).
Forexample,youhaveatableofsalesrepresentativesandtheirsalesfiguresforthepastthree
months:
SALES
MONTH
SALES_REP
1200
May
John
900
May
Cathy
1100
May
Julie
900
June
John
1400
June
Cathy
600
June
Julie
1200
July
John
700
July
Cathy
1000
July
Julie
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MapInfoProcouldalsocomputethetotalsalesforeachrepresentativebyspecifyingintheSQL
Selectdialogbox:
•SelectColumns:SALES_REP,sum(SALES)
•GroupbyColumns:SALES_REP
sum(SALES)
SALES_REP
3300
John
3000
Cathy
2700
Julie
orMapInfoProcouldcomputetheaveragesalesforeachrepresentative:
•SelectColumns:SALES_REP,avg(SALES)
•GroupbyColumns:SALES_REP
avg(SALES)
SALES_REP
1100
John
1000
Cathy
900
Julie
orMapInfoProcouldcomputethetotalsalesforeachmonth:
•SelectColumns:MONTH,sum(SALES)
•GroupbyColumns:MONTH
sum(SALES)
MONTH
3200
May
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sum(SALES)
MONTH
2900
June
2900
July
MapInfoProhassixaggregatefunctions:
•Count(*):countsthenumberofrecordsinagroup.Ittakes*asitsargumentbecauseitapplies
totherecordasawhole,andnottoanyparticularfieldintherecord.
•Sum(expression):calculatesthesumofthevaluesin<expression>forallgrouprecords.
•Average(expression):calculatestheaverageofthevaluesin<expression>foralltherecordsin
agroup.
•WtAvg(expression):calculatestheweightedaverageofthevaluesin<expression>forallthe
recordsinagroup.
•Max(expression):findsthehighestvaluein<expression>forallrecordsinagroup.
•Min(expression):findsthelowestvaluein<expression>forallrecordsinagroup.
Formoreaboutgroupingandorderingyourdata,seetheHelpSystem.
JoiningTablesUsingSQLSelect
WhenperforminganSQLSelectoperationwithmultipletables,MapInfoProneedstojoininformation
fromtherecordsinthevarioustables.Youmayhaveamaptablecontainingonlygraphicobjects
andtheirnamesandatableofstatisticaldataforsomegeographicregion.Youwanttodisplaythe
statisticaldataonthemaptable.YoucoulduseSQLSelecttocreateaquerytableinwhichyour
statisticaldataandmapdataarejoinedinonetable.
Wheneveryouareworkingwithmultipletables,youmustputastatementintheWhereCondition
tellingMapInfoProhowtomatchuptherowsinthedifferenttables.Forexample,youhavethe
WORLDtablethatcontainscountriesandatableofeconomicstatistics(Eco_Stats),alsobroken
downbycountry.
Youwanttocreateaquerytablethatcontainsbothsetsofdata:
•SelectColumns:*(anasteriskindicatesincludeallcolumnsinthequerytable)
•FromTables:World,Eco_Stats
•WhereCondition:World.Country=Eco_Stats.Country
Thetwocolumnsthatyouwanttomatchdonothavetohavethesamename.Forexample,you
haveatableofinternationalcustomers(Int_Cust)thatcontainsasalesterritorycolumn(TERRITORY).
Thiscolumncontainscontinentnames,sinceyourcompanybreaksupitssalesterritoriesaccording
tocontinent.Ifyouwantedtotemporarilyjointhetwotables:
•SelectColumns:*
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•fromTables:World, Int_Cust
•whereCondition:World.Continent = Int_Cust.TERRITORY
•intoTableNamed:WORLD_DENSITY
•SelecttheBrowseResultscheckbox.
Foranexample,seeExample-TotalPopulationandAreabyContinentintheHelpSystem.
UsingtheWhereCondition
TheorderoffieldsusedintheJoindoesnotmatter.Eitherofthefollowingsyntaxesisacceptable:
Select * from A,B where A.field1 = B.field1>
Select * from A,B where B.field1 = A.field1
However,keepinmindthatwhenyouswitchtheorderofgeographicoperands,thegeographic
operatormustalsochange.Thefollowingstatementswillproduceidenticalresults:
Select * from states, cities where states.obj contains cities.obj
Select * from states, cities where cities.obj within states.obj
OrderofClauses
TheorderinwhichJoinclausesareperformeddoesnotmatter.Forexample,eachofthefollowing
arevalidclauses:
Select * from Us_custg,States,City_125
where States.state = City_125.state and States.state = Us_custg.state
and
Us_custg.order_amt > 10000
Select * from Us_custg,States,City_125
where States.state = City_125.state and States.state = US.custg.state
and
Us_custg.order_amt > 10000
Select * from Us_custg,States,City_125
where Us_custg.state = States.state and Us_custg.order_amt > 10000 and
States.state = City_125.state
SomeofthedatausedinthisexampleisfromtheMapInfoProTutorial,whichisonlyavailable
fromthePitneyBowesSoftwareInc.website,http://go.pbinsight.com/webtutorials.
Note:
ErrorHandling
IfaninvalidWhereconditionthatusesanORasalogicaloperatorisdetected,MapInfoProwill
indicateanerrorhasoccurred.UsuallythiserrorwilldisplaywheneverMapInfoProcannotfinda
joinbetweentwotables.Forexample,ifyouhavespecifiedthefollowingincorrectcondition:
Select * from A,B where A.field1 = B.field1
or A.field1 = B.field2
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Thiserrormessagedisplays:
No join specified between A and B. Invalid join condition in Where clause
JoiningTablesGeographically(UsingGeographicOperators)
Whentwotableshavegraphicobjects,MapInfoProcanjointhetablesbasedonthespatial
relationshipbetweenthoseobjects.Thus,evenifyourtablesdonotshareacommoncolumn,you
maybeabletojointhetables.
Geographicoperatorsallowyoutoselectobjectsonthebasisoftheirspatialrelationshiptosome
otherobject.MapInfoProhasaspecialcolumnnameyouusewithgeographicaloperators:"obj"
or"object".Thiscolumnnamereferstothegraphicobjectsthatareattachedtoyourtable.
Thegeographicoperatorsgobetweentheobjectsbeingspecified.Selectthegeographicoperators
fromtheOperatorsdrop-downlist.
Thefollowingtableliststhegeographicoperators:
ObjectAContainsObjectBifB'scentroidisanywherewithinA'sboundary.
Contains
ObjectAContainsEntireObjectBifB'sboundaryisentirelywithinA'sboundary.
ContainsEntire
ObjectAisWithinObjectBifitscentroidisinsideB'sboundary.
Within
ObjectAisEntirelyWithinObjectBifA'sboundaryisentirelywithinB'sboundary.
EntirelyWithin
ObjectAIntersectsObjectBiftheyhaveatleastonepointincommonorifoneofthem
isentirelywithintheother.
Intersects
ThedifferencebetweenContainsandWithinontheonehand,andContainsEntireandEntirely
Withinontheother,hingesonhowthegeographiccomparisonismade.ForContainsandWithin,
thecomparisonisbasedonobjectcentroids.ForContainsEntirelyandEntirelyWithin,the
comparisonsarebasedonthewholeobject.
Thefollowinggraphicillustratesthispoint:
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ObjectAcontainsEntireObjectB
ObjectAcontainsObjectB
ObjectAcontainsObjectB
ObjectBentirelyWithinObjectA
ObjectBwithinObjectA
ObjectBwithinObjectA
ObjectAintersectsObjectB
ObjectBintersectsObjectA
Ineachcase,objectAcontainsobjectBbecausethecentroidofobjectBisinsidetheboundaryof
objectA.However,inthecasesattheleftandinthemiddle,partofobjectBisoutsidetheboundary
ofobjectA.OnlyinthecasetotherightisallofobjectBinsideobjectA.Onlyinthiscasecouldwe
assert"objectAContainsEntireObjectB"or"ObjectBEntirelyWithinObjectA."Further,ifAcontains
entireB,thenAcontainsB,andIfAisentirelywithinBthenAiswithinB.
MapInfoProcanperformasimpleContainsorWithincomparisonmorerapidlythanaContains
EntireorEntirelyWithin.Therefore,unlessyouareabsolutelysurethatobjectsarecompletely
insideotherobjects,youshoulduseContainsandWithinratherthanContainsEntireorEntirely
Within.
Geographicoperatorsprovideawayofjoiningtables.Whentherearenocolumnsinthetableson
whichyoucanbaseyourjoin,youcanuseageographicaloperatortospecifythejoin(intheWhere
Conditionfield).IfyouwanttoperformaquerythatinvolvesbothaCitiestableandaStatestable,
youcanjointhetablesusingeitherofthefollowingexpressions:
1. Cities.objwithinStates.obj
2. States.objcontainsCities.obj
Ineithercase,MapInfoProfindsthecitieswithineachstateandthenassociatesarowforacity
withtherowforthestatethatcontainsit.InthesameSQLSelectquery,youcouldalsouseaggregate
functionstocountthenumberofcitiesperstateortosummarizecity-baseddataonastatewide
basis.
Whenyouhaveatableofcountiesandoneofcustomers,wherecountiesarepolygonsandcustomers
arepoints,youcouldspecifyageographicjoinusingeitherofthefollowinggeographicexpressions:
1. Customer.objwithinCounty.obj
2. County.objcontainsCustomer.obj
Geographicoperatorsareparticularlyusefulinconjunctionwithsubselects.
TheHelpSystemcontainsthisrelatedtopic:
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