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IntheSelectcommandtheexpressionstatesaconditionthatarecordinatablemustmeetinorder
tobeincludedinaquerytable.
•InUpdateColumntheexpressioncalculatesavaluethatisthenenteredintoatable.
•InThematicMappingtheexpressioncalculatesavaluethatisthendisplayedonamap.
•InLabelOptions,youuseexpressionscontainingstringfunctionstofinetuneyourlabels.
Theexpressionsfallintotwobroadcategories:
•Expressionsthatmustevaluatetotrueorfalse.
•Expressionsthatsimplycalculatesomevalue.
Expressionsthatmustevaluatetotrueorfalsealwayshaveacomparisonoperatorandmayhave
multipleclausesconnectedbylogicaloperators.Usetheseexpressionsforselectingobjects.
Expressionsthatsimplycalculatesomevalueneverhaveacomparisonoperatorandgenerallydo
nothavemultipleclauses.UsetheseexpressionstocalculatevaluesforThematicMapping,Update
Column,andLabelWithColumninLayerSettings.
ConstructingSimpleExpressions
Youformulateexpressionsusingcolumn(field)namesandconstants(forexample,specificdata
values),ontheonehand,andfunctionsandoperators,ontheother.Thinkofthecolumnnames
andconstantsasnouns,andfunctionsandoperatorsasverbs,prepositionsandconjunctions.You
alwaysneedatleastonecolumnnameoraconstantinanexpression.Howmanyoperatorsand
functionsyouneeddependsonwhatyouwanttodowithyourexpression.
Thesimplestpossibleexpressionconsistsofacolumnname,forexample:
1. POP_1990
2. STATE
YoucouldusesuchanexpressioninThematicMappingtoindicatewhatdataistoberepresented
onthemap.InUpdateColumnsuchanexpressionwouldtellMapInfoProwhatdatatousein
updatingacolumninthetargettable.
Herearesomeslightlymorecomplexexpressions:
1. POP_1990>17893
2. POP_1990<=POP_1980
3. COUNTY<>"Orange"
4. POP_1980*1.2
5. POP_1990/TOTAL_AREA
6. round(POP_1990/TOTAL_AREA,.1)
Thefirstthreeexamplesusecomparisonoperators.Thefirstteststoseewhetherthe1990population
isgreaterthan(>)someconstant(17893).Thesecondteststoseewhetherthevalueofonecolumn,
POP_1990,islessthanorequalto(<=)thevalueofanothercolumn,POP_1980.Thethirdteststo
seewhetherornotthecountyisOrange.Whenthecountydoesnotequal(<>)"Orange"therecord
isselected.YoucoulduseanyoftheseexpressionsinSelectorintheWhereConditionclauseof
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SQLSelect.Thesecommandsallowyoutoselectasubsetoftherecordsinatable.Theexpression
definesthecharacteristicsofthesubset.
Examples6and7usearithmeticoperators.Example6multiplies(*)thevalueofPOP_1980bya
constant(1.2)whileexample7dividesonecolumn,POP_1990,bythevalueofanothercolumn,
AREA.
Example8usestheroundfunctiontoroundthevalueoftheexpression"POP_1990/TOTAL_AREA"
tothenearesttenth(.1).
Expressions6,7and8donothavecomparisonoperatorsandthereforetheywouldnotbesuitable
foruseinSelectorintheWhereConditionclauseofSQLSelect.However,youcouldusethem
aloneinThematicMapping,UpdateColumn,orSelectcolumnsinSQLSelect.
SettingFilterCriteriaforExpressions
Afiltercriterionisalogicalexpressionthatusuallycomparesacolumnvalueagainstsomeother
value.Forexample,thefollowingfiltercriterionusesthegreater-thanoperator(>)totestwhether
theOrder_Amountcolumnhasavaluegreaterthanonehundred:
Where Condition: Order_Amount > 100
IfaqueryincludestheprecedingWhereConditionclause,MapInfoProselectsonlytherowsthat
haveanOrder_Amountvaluegreaterthanonehundred.
TheWhereConditionfieldcancontaintwoormorelogicalexpressionsiftheexpressionsare
separatedbythewordAndorbythewordOr.IftheexpressionsarejoinedbythewordAnd,MapInfo
Proonlyselectstherowsthatsatisfybothcriteria.IftheexpressionsarejoinedbythewordOr,
MapInfoProselectsanyrowthatsatisfieseithercriterion.
Filtercriteriacanuseanycolumninyourbasetable(s),regardlessofwhetheryouincludedthe
columnintheSelectColumnsfield.
Columnscanbereferredtobynameorbynumber,wherethenumberdesignatestheorderthe
columnhasinSelectColumns.Thus,"col1"and"col6"refertothefirstandsixthcolumns,
respectively.Thenumbermustbeprecededbytheletters"col".
•Formoreinstructionsandrelatedtopics,seetheUsingExpressionstoCreateaNewColumn
topicintheHelpSystem.
ConstructingComplexExpressions
Nowconsiderexamples9and10,thatareabitmorecomplexthan1through8:
1. POP_1990>POP_1980*1.2
2. round((POP_1980*1.2)/TOTAL_AREA,.1)
Wecreatedexpression9bytakingexpression3andreplacingtheconstant"17893"withthewhole
ofexpression6.Similarly,wecreatedexpression10bytakingexpression8andreplacing
"POP_1990"withexpression6.
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Ingeneral,youcreatecomplexexpressionsbycombiningsimpleexpressions.Perhapsthebest
waytolearnhowtodothisislookatsomeoftheexampleswehaveprovided(aboveandfollowing)
andcreateyourownexpressionsbasedonthoseexamples.However,therearetwoverygeneral
techniquesforcreatingcomplexexpressions.
•Replaceacolumnnameoraspecificvaluewithasimpleexpression.
•Combineexpressionsusinglogicaloperators(and,not,or).
Examplesixillustratesthefirsttechnique.Therearemanyexamplesofthesecondtechnique
throughoutthisentry.SeeparticularlythediscussionfollowingUsingLogicalOperatorsin
Expressions.
EnteringSpecificValues(Constants)intoExpressions
UsetheExpressiondialogboxtoformulatemathematicalandalphanumericexpressionsinseveral
MapInfoProdialogboxes.
Whenenteringspecificcharacterstrings,numbers,anddatesintoexpressions,youneedtoobserve
thefollowingconventions.
CharacterStringsinExpressions
Whentypingaparticularstringintoanexpressionyoumustencloseitindoublequotes.MapInfo
Prothentreatsitasastringratherthanasacolumnname.Forexample,strings1and2shown
belowarevalidstringconstants,while3and4arenot.
1. "Orange"
2. "NewYork"
3. Orange
4. NewYork
NumbersinExpressions
Whenenteringspecificnumericalvalues,donotusecommas,dollarsigns,oranycharactersother
thannumerals,decimalpoints,andtheminussignfornegativenumbers.YoucanuseEtodenote
numbersinexponentiation.
DateValuesinExpressions
Datesconsistofamonth,aday,andanoptionalyear.Theyearisspecifiedbytwoorfourdigits
andenclosedindoublequotes.Thecomponentsofadateareseparatedbyhyphensorslashes.
Iftheyearisnotspecified,itdefaultstotheyearsetonyourcomputer'sclock.Thefollowingare
validdataconstants:
WhatMapInfoProExpects
SystemOrder
02/28/2005
M/d/yy
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WhatMapInfoProExpects
SystemOrder
02/28/2005
M/d/yyyy
02/28/2005
MM/dd/yy
02/28/2005
MM/dd/yyyy
2005/02/28
yy/MM/dd
02-28-2005
dd-MMM-yy
UsingMathematicalOperatorsinExpressions
UsetheExpressiondialogboxtoformulatemathematicalandalphanumericexpressionsinseveral
MapInfoProdialogboxes.Mathematicaloperatorsareoftenusedincreatingexpressions.The
followingchartshowstheoperator'ssymbol,name,example,andhowtheoperatorshandledifferent
datatypes.
DetailedExample
Example
Description
Symbol
Date+Number:Date
04/01/2007+4:04/05/2007
A+B
plus
+
FloatNumber+Date:Date
4+232:236
Date-Number:Date
Number-Date:Date
A-B(subtraction)
-A(negative)
minus
-
236-4:232
somenumber-somenumber:Float
someinteger*someinteger:Integer
somenumber*somenumber:Float
A*B
times
*
somenumber/somenumber:Float
A/B
dividedby
/
somenumber^somenumber:Float
A^B
exponentiation
^
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Thefollowingcalculationsarepossible:
•Addingnumberstodatestoyieldanotherdate.
•Subtractinganumberfromadatetoyieldanotherdate.
•Subtractingadatefromadatetoyieldanumber.
Whenyouaddnumberstodatesorsubtractnumbersfromdates,MapInfoProtreatsthenumbers
asspecifyinganumberofdays.Whenyouaddorsubtractaweek,youusethenumber7.
Whenyouaddorsubtractamonth,youuse30or31.WhenMapInfoProsubtractsadatefroma
date,theresultindicatesanumberofdays.
UsingStringOperatorsinExpressions
"concatenation"-connectsstringsandstringexpressions.
+
(canbeusedifprecededbyaspace)
&
Stringsmustbeenclosedindoublequotes.Considerthefollowingexample:
"Ms." + Last_Name
WhenMapInfoProevaluatesthisaspartofanexpressionitplaces"Ms."infrontofeachlastname.
Notethatthestringconstant("Ms.")isinquotes.Similarly,
"Hello," + "world"
givesyou"Hello,world."And
"4"+"5"
givesyou"45."
UsingComparisonOperatorsinExpressions
UsetheExpressiondialogboxtoformulatemathematicalandalphanumericexpressionsinseveral
MapInfoProdialogboxes.Comparisonoperatorsareoftenusedincreatingexpressions.The
followingchartshowsthecomparisonoperatorsymbolsandadescription.
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Description
Operators
"equals"
=
"notequals"
<>
"greaterthan"
>
"lessthan"
<
"greaterthanorequalto"
>=
"lessthanorequalto"
<=
TheHelpSystemcontainstheserelatedtopics:
•NumericalComparison
•StringComparison
•DateComparison
•LogicalComparison
NumericalComparison
Numericalcomparisonsarebasedonthenumericalvaluesoftheexpressionsandnumerical
constants.
English:Allrowswherethehouseholdincomeisabove$65,000.
1. HH_INC>65000
Comment:Donotaddthedollarsignorcomma.MapInfoProdoesnotknowwhattodowithitand
givesyouanerrormessage.
English:Allrowswherethemedianageis42.
1. MED_AGE=42
Comment:Thisexpressionselectsonlythoserecordswherethemedianageisexactly42.When
yourmedianagedatacontainsadecimalportion(whichisthecaseforMapInfoPro-supplied
demographicdata)thenitisunlikelythattherearemanyregionswithamedianageofexactly42.
Thefollowingexpressiongivesyoubetterresults:
1. Round(MED_AGE,1)=42
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Comment:Thefunction"round(somenumber,somenumber)"roundsthefirstnumberintheway
specifiedbythesecond.Inthisexample,thefirstnumberisthemedianage(MED_AGE)andthe
secondis1,indicatingthatmedianageistoberoundedtothenearestwholenumber.
English:Allrowswheretheamountdoesnotequal$23,000.
1. AMOUNT<>23000
Comment:YoumightwanttousetheRoundfunction,asin10,ifyouarenotconcernedthatthe
valuebeexactly23000.
StringComparison
Stringcomparisonsarebasedontheexactcharactercontentofthestring.Inthiscase">"means
"alphabeticallygreaterthan"(forexample,comesafterinthealphabet)and"<"means"alphabetically
lessthan."
Whentypingastringintoanexpression,youshouldencloseitinquotessothatMapInfoProknows
totreatitasastring,ratherthantreatingitasacolumnname.
English:AllrowswherethevendorisAcme.
1. VENDOR="Acme"
Comment:NotethatAcmeisinquotessothatMapInfoProknowstotreatitliterally(asacharacter
string)ratherthantosearchforacolumnnamedAcme.
English:AllrowswherethevendorisnotAcme.
1. VENDOR<>"Acme"
DateComparison
English:AllentriesreceivedonOctober9,1991.
1. RECEIVED="10-9-91"
Considertheseconventions:
Note:
•Thedateisenclosedinquotes
•Itisintheform:Month,Day,Year
•Thenumbersinthedataareseparatedbyahyphenoraslash(/)
•Twocharacterswereusedfortheyear.Youcanalsousefourcharacters(1991)
English:AllreceivedafterOctober9,1991.
1. RECEIVED>"10-9-91"
Comment:ThisexpressiondoesnotselectthosereceivedonOctober9,1991.Whenyouwant
themaswell:
1. RECEIVED>="10-9-91"
English:RecordsforallreceivedbeforeAugust.
1. Month(RECEIVED)<8
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Comment:ThisexpressionusestheMonthfunctiontoextractthemonthinthedate.Itdoesnot
specifyanyparticularyear.Whenyourdatabasehasrecordsforseveralyears,thisexpressiondoes
notpayattentiontotheparticularyear.
LogicalComparison
English:Allthathaveshipped.
1. Shipped
Comment:Thecolumn"Shipped"isalogicalcolumn.Itcontains"T"fortrue,oryes,and"F"for
false,orno.Whenanorderisshipped,itismarked"T".Otherwise,itisnotshipped.Forordersthat
areshipped,expression28evaluatestotrue.Forordersnotshippeditevaluatestofalse.
English:Allthathavenotshipped.
1. Str$(Shipped)="F"
2. NotShipped
UsingGeographicOperatorsinExpressions
MapInfoProhasseveralgeographicoperators.Usethemtoselectobjectsonthebasisoftheir
spatialrelationshiptosomeotherobject.MapInfoProhasaspecialkeywordyouusewith
geographicaloperators:"obj"or"object".ThiskeywordtellsMapInfoProthatithastogetvalues
basedonthegraphicalobjectsinthetableratherthanthetabulardata.
Thegeographicoperatorsgobetweentheobjectsbeingspecified.Selectthegeographicoperators
fromtheOperatorsmenu.Herearethegeographicoperators:
ObjectAContainsobjectBifB'scentroidisanywherewithinA'sboundary.
Contains
ObjectAContainsEntireobjectBifB'sboundaryisentirelywithinA'sboundary.
ContainsEntire
ObjectAContainsPartobjectBifB'sboundaryispartlywithinA'sboundary.
ContainsPart
ObjectAisWithinobjectBifitscentroidisinsideB'sboundary.
Within
ObjectAisEntirelyWithinobjectBifA'sboundaryisentirelywithinB'sboundary.
EntirelyWithin
ObjectAisPartlyWithinobjectBifA'sboundaryispartlywithinB'sboundary.
PartlyWithin
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ObjectAIntersectsobjectBiftheyhaveatleastonepointincommon.
Intersects
"ContainsPart"and"PartlyWithin"areexactlyequivalentto"Intersects"-thesearealltreatedthe
samewaybyMapInfoPro,sothestandardsyntax"Intersects"isalmostuniversallyused.
"Contains"and"Within"areconcernedonlywithobjects'centroids.
"ContainsEntire"and"EntirelyWithin"areconcernedwiththeareacoveredbyaregionobject;the
locationofthecentroiddoesnotmatter.SeeexamplesinUsingGeographicOperatorsinExpressions
intheHelpSystem.
UsingLogicalOperatorsinExpressions
"And","or",and"not"arelogicaloperators.YouusethemtocombineexpressionsinSelectandthe
WhereConditionclauseofSQLSelect.MapInfoProtreatseachsuchanexpressionasatest,which
itappliestoeachrecordinthetable.Foreachtestitgetsayes/no(true/false)answer.MapInfoPro
usesthelogicaloperatorstotellithowtocombinetheindividualyes/noanswersintoanoverall
yes/noanswer:Doesthecurrentrecordmeettheselectioncondition?
Description
Operator
is"true"if(andonlyif)bothofitsarguments(theexpressionsitjoinstogether)
aretrue.Arecordmustsatisfybothoftheseconditionsifitistobeselected.
and
is"true"ifeitherone,orboth,ofitsarguments(theexpressionsitjoinstogether)
aretrue.Arecordneedsatisfyonlyoneoftheseconditionsifitistobeselected.
Itisalsoselectedifbothofitsconditionsaresatisfied.
or
is"true"ifitsargument(theexpressionitappliesto)isfalse.Arecordisselected
ifitdoesnotmeetthestatedcondition.
not
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Supposeyouwanttoselectallpropertiesthatareworth$250,000ormoreandareinColumbia
county.Eachrecordhastomeettwocriteria,eachofwhichcanbeformulatedasasimpleexpression:
1. VALUE>=250000
2. COUNTY="Columbia"
Youcouldperformoneselectionforallpropertiesworth$250,000ormore.Thenyoucouldperform
anotherselectiononthatresult,lookingforallpropertiesinColumbiacounty.However,itiseasier
tocombinethetwooperationsintooneusingthelogicaloperator"and".
1. COUNTY="Columbia"andVALUE>=250000
WhenMapInfoProexaminesarecordtoseewhetherornotitmeetstheconditionsetbythis
expression,itmakesthetwotests:DoesCOUNTYequalColumbia?IstheVALUEequaltoor
greaterthan250000?Whentheanswertobothofthesequestionsistrue(oryes),thentherecord
isacceptedintothecurrentselection.Whentheanswertooneorbothofthequestionsisno(or
false),thentherecordisnotacceptedintothecurrentselection.
Now,whatifyouwantallpropertiesworth$250,000ormoreandnotinColumbiacounty?Youcan
use"not"tonegatethefirstclauseofexpression33,yieldingexpression34:
1. not(COUNTY="Columbia")andVALUE>=250000
OnlyrecordswherethecountyisnotColumbiasatisfythefirstclauseofexpression34.Nowconsider
expression35:
1. not(COUNTY="Columbia"andVALUE>=250000)
Expression35issimplythenegationofexpression33.Anyrecordthatwouldsatisfy33doesnot
satisfy35.Anyrecordthatdoesnotsatisfy33satisfies35.
Youcanuse"or"whenyouwanttospecifyalternativeconditions,suchas:
1. COUNTY="Columbia"orCOUNTY="Greene"
Anyrecordevaluatedagainstthisconditionisacceptedifitscountyisanyoneofthetwospecified
counties.Onecould,ofcourse,usenumericaltestsaswell.Forexample:
1. TOTAL_AREA>40orVALUE>250000
Thisteststoseewhethertheareaisgreaterthan40orthevalueisgreaterthan250000.When
eitheroneistrueofarecord,thenthatrecordisacceptedintotheselection.
Informulatingexpressionsusinglogicaloperatorsyouhavetobecarefulhowyouusethem.The
followingexpression,whileitseemsOK,doesnotwork:
1. COUNTY="Columbia"or"Greene"
JudgingfromitsEnglishtranslation-COUNTYequalsColumbiaorGreene-thisexpressionshould
operatejustlikeexpression36andgiveusanyrecordcontainingColumbiaCountyorGreene
County.ButtherulesofcomputationallogicandtherulesofEnglishareabitdifferent.
WhenMapInfoProreadsexpressionsitreadsthemfromlefttoright.Oneofthethingsithastodo
istodeterminehowtheitemsintheexpressionaregrouped.Thinkofthisoperationasinserting
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