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limitedtocreatingonederivedcolumn.Youcancreateasmanyderivedcolumnsasyouwant.Notethat
themorederivedcolumnsyoucreate,thelongeritwilltakeMapInfoProfessionaltoexecutethequery.
Youcanalsocreatederivedcolumnsbasedontheaggregatefunctionscount,sum,avg,wtavg,max,
andmin.Forexample:
• sum(Population)
wouldgiveyouthepopulationfortheentireworld.
• sum(Area(obj),"sqmi")
wouldgiveyoutheareafortheentireworld.
CreatingColumnAliases
WhenMapInfoProfessionalcreatesaderivedcolumn,itusestheexpressionitselfasthenameforthat
derivedcolumn,whichcanbeawkward.Youcan,however,specifyanaliasforthecolumn.Forexample,
thepopulationdensitycolumninourDENSITYBrowserwastitled:
• Population/Area(obj,"sqmi")
Torenamethecolumn,addthenewnametotheSelectColumnsboxwhenlistingthecolumns.
Thealiasmustfollowtheexpression.Itmustalsobeseparatedfromtheexpressionbyablankspace
andenclosedinquotes.Forexample:
• Country,Population/Area(obj,"sqmi")"POP_DENSITY"
WhenMapInfoProfessionalcreatesthetemporaryquerytable,thepopulationdensitycolumnwillnow
benamedPOP_DENSITY.
Youcanusealiasestorenameanycolumninatable,notjustderivedcolumns.Forexample,ifeach
countryinyourtableisaseparatesalesterritoryforyourcorporation,youmightwanttorenamethe
Countrycolumn"TERRITORY".Theprocedureisidentical:
• Country"TERRITORY",Population/Area(obj,"sqmi")"POP_DENSITY"
Foranotherexample,seeExample-ComputingTotalWorldPopulationDensityintheHelpSystem.
AggregatingData
Whenyouaggregatedata,youperformamathematicaloperationonallofacolumn'svaluesinallof
therecordsinyourtable.UnliketheSelectcommand,whichonlyallowsyoutoperformmathematical
functionsonindividualrecords,SQLallowsyoutoaggregate(orsummarize)dataacrossrecords.
MapInfoProfessionallooksforeachuniquesetofdatavaluesinthespecifiedcolumnorcolumnsand
createsonerowforeachsuchuniqueset.Whenyouaggregatedata,youneedtospecify:
• Howtherecordswillbegrouped.
• Howthedatawillbeaggregated(summarized).
Forexample,youhaveatableofsalesrepresentativesandtheirsalesfiguresforthepastthreemonths:
SALES
MONTH
SALES_REP
1200
May
John
900
May
Cathy
1100
May
Julie
900
June
John
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SALES
MONTH
SALES_REP
1400
June
Cathy
600
June
Julie
1200
July
John
700
July
Cathy
1000
July
Julie
MapInfoProfessionalcouldalsocomputethetotalsalesforeachrepresentativebyspecifyinginthe
SQLSelectdialogbox:
• SelectColumns:SALES_REP,sum(SALES)
• GroupbyColumns:SALES_REP
sum(SALES)
SALES_REP
3300
John
3000
Cathy
2700
Julie
orMapInfoProfessionalcouldcomputetheaveragesalesforeachrepresentative:
• SelectColumns:SALES_REP,avg(SALES)
• GroupbyColumns:SALES_REP
avg(SALES)
SALES_REP
1100
John
1000
Cathy
900
Julie
orMapInfoProfessionalcouldcomputethetotalsalesforeachmonth:
• SelectColumns:MONTH,sum(SALES)
• GroupbyColumns:MONTH
sum(SALES)
MONTH
3200
May
2900
June
2900
July
MapInfoProfessionalhassixaggregatefunctions:
• Count(*):countsthenumberofrecordsinagroup.Ittakes*asitsargumentbecauseitappliestothe
recordasawhole,andnottoanyparticularfieldintherecord.
• Sum(expression):calculatesthesumofthevaluesin<expression>forallgrouprecords.
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• Average(expression):calculatestheaverageofthevaluesin<expression>foralltherecordsina
group.
• WtAvg(expression):calculatestheweightedaverageofthevaluesin<expression>foralltherecords
inagroup.
• Max(expression):findsthehighestvaluein<expression>forallrecordsinagroup.
• Min(expression):findsthelowestvaluein<expression>forallrecordsinagroup.
Formoreaboutgroupingandorderingyourdata,seetheHelpSystem.
JoiningTablesUsingSQLSelect
WhenperforminganSQLSelectoperationwithmultipletables,MapInfoProfessionalneedstojoin
informationfromtherecordsinthevarioustables.Youmayhaveamaptablecontainingonlygraphic
objectsandtheirnamesandatableofstatisticaldataforsomegeographicregion.Youwanttodisplay
thestatisticaldataonthemaptable.YoucoulduseSQLSelecttocreateaquerytableinwhichyour
statisticaldataandmapdataarejoinedinonetable.
Wheneveryouareworkingwithmultipletables,youmustputastatementintheWhereConditiontelling
MapInfoProfessionalhowtomatchuptherowsinthedifferenttables.Forexample,youhavetheWORLD
tablethatcontainscountriesandatableofeconomicstatistics(Eco_Stats),alsobrokendownbycountry.
Youwanttocreateaquerytablethatcontainsbothsetsofdata:
• SelectColumns:*(anasteriskindicatesincludeallcolumnsinthequerytable)
• FromTables:World,Eco_Stats
• WhereCondition:World.Country=Eco_Stats.Country
Thetwocolumnsthatyouwanttomatchdonothavetohavethesamename.Forexample,youhave
atableofinternationalcustomers(Int_Cust)thatcontainsasalesterritorycolumn(TERRITORY).This
columncontainscontinentnames,sinceyourcompanybreaksupitssalesterritoriesaccordingto
continent.Ifyouwantedtotemporarilyjointhetwotables:
• SelectColumns:*
• 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,thegeographicoperator
mustalsochange.Thefollowingstatementswillproduceidenticalresults:
Select * from states, cities where states.obj contains cities.obj
Select * from states, cities where cities.obj within states.obj
OrderofClauses
TheorderinwhichJoinclausesareperformeddoesnotmatter.Forexample,eachofthefollowingare
validclauses:
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
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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
SomeofthedatausedinthisexampleisfromtheMapInfoProfessionalTutorial,whichisonly
availablefromthePitneyBowesSoftwareInc.website,http://go.pbinsight.com/webtutorials.
Note:
ErrorHandling
IfaninvalidWhereconditionthatusesanORasalogicaloperatorisdetected,MapInfoProfessional
willindicateanerrorhasoccurred.UsuallythiserrorwilldisplaywheneverMapInfoProfessionalcannot
findajoinbetweentwotables.Forexample,ifyouhavespecifiedthefollowingincorrectcondition:
Select * from A,B where A.field1 = B.field1 or A.field1 = B.field2
Thiserrormessagedisplays:
No join specified between A and B. Invalid join condition in Where clause
JoiningTablesGeographically(UsingGeographicOperators)
Whentwotableshavegraphicobjects,MapInfoProfessionalcanjointhetablesbasedonthespatial
relationshipbetweenthoseobjects.Thus,evenifyourtablesdonotshareacommoncolumn,youmay
beabletojointhetables.
Geographicoperatorsallowyoutoselectobjectsonthebasisoftheirspatialrelationshiptosomeother
object.MapInfoProfessionalhasaspecialcolumnnameyouusewithgeographicaloperators:"obj"or
"object".Thiscolumnnamereferstothegraphicobjectsthatareattachedtoyourtable.
Thegeographicoperatorsgobetweentheobjectsbeingspecified.Selectthegeographicoperatorsfrom
theOperatorsdrop-downlist.
Thefollowingtableliststhegeographicoperators:
ObjectAContainsObjectBifB'scentroidisanywherewithinA'sboundary.
Contains
ObjectAContainsEntireObjectBifB'sboundaryisentirelywithinA's
boundary.
ContainsEntire
ObjectAisWithinObjectBifitscentroidisinsideB'sboundary.
Within
ObjectAisEntirelyWithinObjectBifA'sboundaryisentirelywithinB's
boundary.
EntirelyWithin
ObjectAIntersectsObjectBiftheyhaveatleastonepointincommonorif
oneofthemisentirelywithintheother.
Intersects
ThedifferencebetweenContainsandWithinontheonehand,andContainsEntireandEntirely
Withinontheother,hingesonhowthegeographiccomparisonismade.ForContainsandWithin,the
comparisonisbasedonobjectcentroids.ForContainsEntirelyandEntirelyWithin,thecomparisons
arebasedonthewholeobject.
Thefollowinggraphicillustratesthispoint:
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ObjectAcontainsEntireObject
B
ObjectAcontainsObjectB
ObjectBwithinObjectA
ObjectAcontainsObjectB
ObjectBwithinObjectA
ObjectBentirelyWithinObjectA
ObjectAintersectsObjectB
ObjectBintersectsObjectA
Ineachcase,objectAcontainsobjectBbecausethecentroidofobjectBisinsidetheboundaryofobject
A.However,inthecasesattheleftandinthemiddle,partofobjectBisoutsidetheboundaryofobject
A.OnlyinthecasetotherightisallofobjectBinsideobjectA.Onlyinthiscasecouldweassert"object
AContainsEntireObjectB"or"ObjectBEntirelyWithinObjectA."Further,ifAcontainsentireB,then
AcontainsB,andIfAisentirelywithinBthenAiswithinB.
MapInfoProfessionalcanperformasimpleContainsorWithincomparisonmorerapidlythanaContains
EntireorEntirelyWithin.Therefore,unlessyouareabsolutelysurethatobjectsarecompletelyinside
otherobjects,youshoulduseContainsandWithinratherthanContainsEntireorEntirelyWithin.
Geographicoperatorsprovideawayofjoiningtables.Whentherearenocolumnsinthetablesonwhich
youcanbaseyourjoin,youcanuseageographicaloperatortospecifythejoin(intheWhereCondition
field).IfyouwanttoperformaquerythatinvolvesbothaCitiestableandaStatestable,youcanjoin
thetablesusingeitherofthefollowingexpressions:
1. Cities.objwithinStates.obj
2. States.objcontainsCities.obj
Ineithercase,MapInfoProfessionalfindsthecitieswithineachstateandthenassociatesarowfora
citywiththerowforthestatethatcontainsit.InthesameSQLSelectquery,youcouldalsouseaggregate
functionstocountthenumberofcitiesperstateortosummarizecity-baseddataonastatewidebasis.
Whenyouhaveatableofcountiesandoneofcustomers,wherecountiesarepolygonsandcustomers
arepoints,youcouldspecifyageographicjoinusingeitherofthefollowinggeographicexpressions:
1. Customer.objwithinCounty.obj
2. County.objcontainsCustomer.obj
Geographicoperatorsareparticularlyusefulinconjunctionwithsubselects.
TheHelpSystemcontainsthisrelatedtopic:
• PerformingSubselects
JoiningTwoorMoreTables
Typically,youstoreyourinformationinseveraldifferenttables.Youhaveyourowndatafiles,andyou
mayalsohavevariousdatabasesofstatisticalinformationthatyoupurchasedfromMapInfoProfessional.
SQLSelectallowsyoutocreaterelationaljoinssothatyoucanbringinformationfromthesevarious
tablestogetherintoasingleresultstable.
Whenyouwanttojointwotables,youmustdeterminewhetheroneofthecolumnsinthefirsttable
containsvaluesthatmatchoneofthecolumnsinthesecondtable.Imaginethatyouhaveatableof
countiesthathasdemographicinformation--thepopulationofpeopleinvariousageranges,ethnicgroups,
andoccupationalcategoriesineachcounty.Youmayalsohaveadatabasecontaininginformationabout
customerorders.Youwanttoexaminethesetwotablesandseeifcertainkindsoforderscomefrom
countieshavingcertaindemographiccharacteristics.Perhapsyouwanttoselectcountiesaccordingto
combinationsofordersanddemographiccharacteristics.Todothisyouhavetobeabletojointhetwo
tables.
Supposethecountiestablecontainsthenameofthecounty.Similarly,oneofthecolumnsintheorder
tablecontainsthenameofthecountyinwhichtheorderoriginated.Thus,thesetwotableshaveone
fieldincommon,thecountyname.MapInfoProfessionalcanusethatcommonfieldtojointhetwotables.
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Chapter9:SelectingandQueryingData
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County
Customer
Order#
Pop_1990
Pop_1980
CountyName
Foster
Francis
478001
27,135
23,789
Foster
Foster
James
478002
34,846
35,456
Williamette
Mason
Wickwire
478003
151,201
147,101
Mason
CountiesTableOrdersTable
WithintheSQLSelectdialogbox,youusetheWhereConditionfieldtotellMapInfoProfessionalhow
tojointhetwotables.TheSQLSelectdialogboxmightlooklikethis:
Select Columns:
*
From Tables:
Counties, Orders
Where Condition:
Counties.CountyName = Orders.County
Theorderofthetablenames(intheFromTablesfield)isimportant.Ifbothtablescontainmapobjects,
theresultstablewillonlyretainthemapobjectsfromthefirsttablelistedintheFromTablesfield.
Furthermore,whenthequeryiscomplete,MapInfoProfessionalautomaticallyselectssomeorallofthe
rowsfromwhichevertableislistedfirstintheFromTablesfield.Thus,intheprecedingexample,MapInfo
ProfessionalwillselectsomeoralloftherowsfromtheCountiestable.Theresultstablewillalsoinclude
datacopiedfromtheOrderstable,buttheOrderstablewillnotbeselectedperse.
Whenyoujointwotables,thenumberofrowsintheresultstabledependsonhowwellthetwotables
matchup.SupposeyouhaveanOrderstablewith10,000rows,andyoujointheOrderstabletothe
Statestable,whichhasfiftyrows.Theresultstablemaycontainasmanyas10,000rows.However,if
someoftherowsintheOrderstablefailtomatchanyoftherowsintheStatestable,theresultstable
willcontainfewerthan10,000rows.Thus,if400oftherowsintheOrderstabledonothaveastate
name(perhapsduetodata-entryerrors),andiftherelationaljoinreliesonthestatename,theresults
tablemayonlycontain9,600rows.
YoucanuseUpdateColumntomodifytheresultsofanSQLSelectmulti-tablejoin.Whenyouwantto
updateacolumninonetablewithinformationfromanothertable,youcan:
1. JointhetableswithSQLSelect.
2. UseUpdateColumnonSelection.Theupdateautomaticallytakeseffectintheappropriatebase
table.
3. Formoreinformation,seePerformingOuterJoinsandUsingtheInstrFunctiontoFindDatainthe
HelpSystem.
FindingDuplicateValuesinaColumn
Oftendataisenteredintotablesbymanydifferentusers.Sometimesdataisrepeated,orthereiscommon
informationinseveraldifferentrecords.Thissectionexplainshowtofindallrowsinatablethat,fora
givencolumn,shareavaluewithanotherrow.ThisisaccomplishedbyperformingtwoSQLSelect
statements.
ThefirstSQLSelectstatementproducesaquerytablewithtwocolumns.Thefirstcolumnisalistofall
uniquevaluesinthedatacolumnandthesecondcolumnliststhenumberoftimesthateachunique
valueoccurs.ThesecondSQLstatementcompareseachdatacolumnvaluewithallrowsintheQuery
tablewherethecountisgreaterthanone.
Inthenextexample,thereisatableEMPLOYEEthathastwocolumnsId_NumandName.
Tofindtheduplicatevalues,performthetwoSQLSelects,modifyingthemwhereindicated.
1. OntheQuerymenu,clickSQLSelectandfillintheSQLSelectdialogbox.
• SelectColumns:ID_Num,Count(*)
• fromTables:EMPLOYEE
• GroupbyColumns:1
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• OrderbyColumns:2 desc
• intoTableNamed:Selection
SubstitutethenameofyourdatacolumnforID_NumandthenameofyourtableforEMPLOYEE.The
number1intheGroupByColumnsboxwillgrouptherowbyID_Num(thefirstcolumn).The2Desc
intheOrderbyColumnsboxwillarrangetherecordsindescendingorderbasedonthevaluesin
thecount(*)field(thesecondcolumn).
ThisSQLSelectstatementreturnsaquerytablewithtwocolumns.Thefirstcolumncontainsevery
identificationnumberpossessedbyatleastoneemployee.Thesecondcolumncontainsthenumber
ofemployeesthathavethatidentificationnumber.Therowsaresortedbythenumberofemployees
thathaveeachidnumber(forexample,thecount).
2. OntheQuerymenu,clickSQLSelectandfillinthedialogbox.
Also,changeEMPLOYEEtothenameofyourtableandID_Numtothenameofyourdatacolumn.
Intheexample,theSQLstatementreturnsaquerytablecontainingalloftherowsfromEMPLOYEE
withduplicateddatacolumnvalues.ThewhereconditionselectsallrowsfromEMPLOYEEthathave
anidentificationnumberthatisthesameasoneoftheIDnumbersintheCount_By_IDquerytable.This
sub-selectfindsallidentificationnumbersthatoccurmorethanonce.
CalculatingtheDistancetoaFixedPoint
InMapInfoProfessionalitispossibletocalculatethedistancefromonepointtoanother.Thisexample
showshowtocalculatethedistancefromafixedpointtoeverypointinageocodedtableandstorethe
resultinanothertable.
1. Determinethelocationofthefixedpoint.Tofindthepositionofasymbolonthemap,double-click
thesymbolwiththeSelecttool.Inthisexample,theXvalueis-101.697209andtheYvalueis
35.550036.
2. OntheQuerymenu,clickSQLSelectandfillintheSQLSelectdialogbox,substitutingyourXand
Yvaluesforthevaluesmentionedabove
AsinthepreviousSQLquery,replaceEMPLOYEEwiththenameofyourtable,andLNameandFName
withthenameoftherelevantcolumnfromyourtable.
• SelectColumns:LName, FName, Distance(-101.679209, 35.550036,
CentroidX(obj), CentroidY(obj), "mi") "Dist"
• fromTables:EMPLOYEE
• intoTableNamed:CUSTDIST
3. ClickOK.Theresultingquerytablecontainslastnamesandfirstnamesplusanewcolumncalled
DISTANCEwhichrecordsthedistancebetweenthefixedlocation(-101.697209,36.550036)and
thepointassociatedwitheachrowofthetable.
4. Tosavetheresultsinapermanenttable,ontheFilemenu,clickSaveCopyAs,andsavethe
CUSTDISTtable.
5. ForinstructionsonenteringSQLqueriesusingtheExpertbutton,seetheHelpSystem.
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Chapter9:SelectingandQueryingData
10
Creating Thematic and Other
Themed Maps
Thematicmappingisapowerfulwaytoanalyzeandvisualizeyourdata.Yougive
graphicformtoyourdatasothatyoucanseeitonamap.Patternsandtrends
thatarealmostimpossibletodetectinlistsofdatarevealthemselvesclearlywhen
youusethematicshadingtodisplaythedataonamap.
YoucancreatethematicmapswithMapInfoProfessionalusingthefollowing
methods:rangesofvalues,graduatedsymbols,dotdensity,individualvalues,
barandpiechartsandcontinuousgrid.Therearealsoseveralvariationsonand
optionswithinthesemethods,suchasbivariatethematicmappingandinflection
point,thatgiveyouevenmorewaystoanalyzeyourdata.
ForclarificationoftheusesofthematicmapsinMapInfoProfessional,seeMapInfo
ProfessionalinActionintheHelpSystem.
TheHelpSystemalsocontainstheserelatedtopics:
• BivariateThematicMapping
• Workingwith3DandPrismMaps
Inthissection:
• MapInfoProfessionalinAction . . . . . . . . . . . . . . . . . . . .260
• UsingThematicMappingtoAnalyzeInformation . . . . .260
• CreatingaThematicMap . . . . . . . . . . . . . . . . . . . . . . . . .273
• ChangingtheDisplayParametersofaMap . . . . . . . . .278
• UpdatingColumnsusingThematicMapping . . . . . . . . .280
• WorkingwithGridSurfaceMaps . . . . . . . . . . . . . . . . . . .286
MapInfo Professional in Action
Sinceyouhaveallthetoolsyouneedtomakeeffectiveandusefulmaps,itistimetotalkaboutwhat
makesamapeffectiveanduseful.Whateveryouneedyourmaptosay,whetheritistoconveyinformation,
calculatedistancesbetweenhealthcareprovidersandtheirpatients,orgetacountofthenumberof
customersthatlivewithinagivenradiusofanoutletlocation,MapInfoProfessionalcanhelpyoudothat.
Bymakingselectionsfromyourtable,youcanextractinformationfromsetsandsubsetsofyourdataor
seepatternsanddistributions,gettinganswerstosuchquestionsas:Whichofmycustomersbought
morethan$5000ofequipment?Whichofmycustomersislocatedwithina200mileradiusofmy
warehouse?Whichofmycustomersboughtmorethan$5000ofequipmentandislocatedwithina200
mileradiusofmywarehouse?Formoreonselecting,seeSelectingYourDatainMapInfoProfessional,
andQueryingYourDatainMapInfoProfessional.
MapInfoProfessionalreferstothisgroupingoflikeinformationasthematicmapping.
• Foranexample,seeCanYouGiveMeanExampleintheHelpSystem.
Using Thematic Mapping to Analyze Information
Thematicmappingistheprocessofenhancingyourmapaccordingtoaparticulartheme.Atthe
cornerstoneofthethemeisthedatainyourtable.Themesrepresentyourdatawithshadesofcolor,fill
patterns,symbols,barandpiecharts,andgrids.
WithMapInfoProfessional,youcreatedifferentthematicmapsbyassigningthesecolors,patterns,or
symbolstomapobjectsaccordingtospecificvaluesinyourtable.MapInfoProfessional'sbarandpie
chartsallowyoutomakedatacomparisonsforeachrecord.Gridsallowyoutoseecontinuouschange
ofyourdataacrossanarea.
Thethematicmapfeatureusesawizardmadeupofaseriesofthreedialogboxestohelpyouchoose
thetypeofthematicmapyouwant,thetable(s)andfieldsthatwillbeusedtoconstructthemap,anda
varietyofoptionstocustomizeyourmap.
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