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Inthefirstpartofthischapter,wediscussedselectionsandquerytablesasaresultofusingQuery
Selectcommand.WenowturnourattentiontoanextremelypowerfulandusefulfeatureinMapInfo
Pro,queryingbySQLSelect.
WhileMapInfoPro'sSelectcommandletsyouformulatesophisticatedqueries,SQLSelectgoes
evenfurther.TherecordsinthequerytablegeneratedbytheSelectcommanddonothaveany
informationinthemthatisnotcontainedintherecordsofthebasetable.Theyare,infact,thesame
records.Theyhavebeenarrangedsothattheycanbeviewedtogether.
WithSQLSelectyoucancreatequerytablescontaininginformationthatwasonlyimplicitinthe
basetable(s).
TheSQLSelectdialogboxisoneofthemostelaborateonesinMapInfoPro.Butdonotbe
intimidated.Onceyoulearnwhateachboxisusedfor,itisfairlysimpletocreatepowerfulselection
statements.Youcantypedirectlyintotheboxesoryoucanusethepopupmenusontherightto
enteritemsintotheboxes.
Theeasiestwaytodescribethedialogboxistowalkyouthroughanexample,step-by-step.This
exampleusesdatafromtheWORLDtableincludedinMapInfoPro,soyoucantryoutthisSQL
Selectexerciseyourself.Wehaveincludedabriefdescriptionofthepartsofthedialogboxwith
eachstep.Acompletedescriptionofeachboxisgivenaftertheexample.
Expandingthetextcontrolsisnoguaranteethattheresultingquerycanbehandledby
MapInfoPro.YoucanstillreceivetheQuerytoocomplexerrorwhenaddinglargerqueries.
Note:
Example1-ComputingPopulationDensityUsingArea
Inthisexample,wewillusetheworldmaptocreateatableofallthecountriesthathaveapopulation
densityofover500peoplepersquaremile.
Thefollowingformulacomputespopulationdensity:
•POPULATION/AREA
WhiletheWORLDtablehasapopulationcolumn(pop_1994),itdoesnotincludeacolumnfor
countryarea.However,sincetheWORLDtablehasgraphicobjectsassociatedwiththerecords,
MapInfoProcancomputethetotalareaforeachcountry.
OpentheWORLD.TABtable,andmaximizeitsdisplaybyclickingthewindow'smaximizebutton.
OntheQuerymenu,clickSQLSelecttodisplaytheSQLSelectdialogbox.
TocompletetheSQLSelectdialogbox:
1. IntheFromTablesbox,chooseWORLDfromtheTablesdrop-downlist.
YoucanspecifymorethanonetableinanSQLstatement.Thisexampleusesonlyonetable,
WORLD.
YoushouldfillintheFromTablesboxbeforeyoufillintheSelectColumnsbox.MapInfoPro
usesthetablesintheFromTablesboxtogeneratethelistofcolumnsintheColumnsdrop-down
list.
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2. PlaceyourcursorintheSelectColumnsboxanddeletetheasterisk(*).Inthisexample,wewill
specifyalistofcolumnstobeincludedintheresultingquerytable,insteadofincludingallcolumns.
Anasterisk(*)intheSelectColumnsboxmeansbydefaultthatallcolumnswouldbe
queried.
Note:
Remember,thequerytableisthetemporarytablethatMapInfoProcreatestostoretheresults
ofthequery.
3. SelectCountryfromtheColumnsdrop-downlist.
4. Selectpop_1994fromtheColumnsdrop-downlist.
Now,weneedtocomputepopulationdensity.Remember,populationdensityiscomputedby
dividingpopulationbyarea.ThereisnoAreacolumninthetable.However,thereisafunction,
Area,whichwillcomputetheareaofanymappableobject.SincetheWORLDtableismappable,
MapInfoProcancomputetheareaofeachcountryand,therefore,thepopulationdensityofeach
country.
5. Selectthedivisionsign(/)fromtheOperatorslist.
6. SelectAreafromtheFunctionspopup.
Thiscreatesaderivedcolumn.Aderivedcolumnisacolumnthatcontainstheresultsof
calculationsperformedonanothercolumnorcolumns.WhenMapInfoProcreatesthequery
table,itwillincludetwocolumns:theCountrycolumnandthepop_1994/Area(obj,"sqmi")
column,whichisourpopulationdensitycolumn.MapInfoProincludesaunitsstatementwithall
geographicfunctions.IfyouwantedMapInfoProtoreturntheareainsquarekilometers,you
wouldchange"sqmi"to"sqkm."
Now,weneedtobuildanexpressionthatselectsonlythosecountrieswhosepopulationdensity
isover500peoplepersquaremile.
7. TabtotheWhereConditionboxandselectpop_1994fromtheColumnsdrop-downlist.
8. Selectthedivisionsign(/)fromtheOperatorsdrop-downlist.
9. SelectAreafromtheFunctionspopup.
10.Selectthegreaterthansign(>)fromtheOperatorsdrop-downlist.
11.Typethenumber500.
Wehavenowbuilttheexpression"Selectallcountrieswhosepopulationdensity
(pop_1994/Area(obj,"sqmi"))ismorethan(>)500peoplepersquaremile."
12.LeavetheGroupbyColumnsboxblank.
13.TabtotheOrderbyColumnsboxandselectCountryfromtheColumnslist.
TheOrderbyColumnsboxallowsyoutospecifytheordertherecordsinthequerytablewill
display.ByselectingCountry,MapInfoProwilllisttherecordsinalphabeticalorder,according
tocountryname.
14.TabtotheIntoTableNamedboxandtypeDENSITY.
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Bydefault,MapInfoPronamesthequerytableQuery1.Subsequentquerytableswillbenamed
Query2,Query3,andsoon.Youcanchangethenameofthequerytablebytypinginanewtable
nameintheIntoTableNamedbox.MapInfoProwillnamethequerytableDENSITY.
15.ClickVerify.MapInfoProchecksthesyntaxofyourSQLstatement.Ifthereareanyerrorsin
yourstatement,MapInfoProgivesyouanerrormessagetellingyouwhattheerrorisandwhich
boxcontainstheerror.
16.SelecttheBrowseResultscheckboxtocreateaBrowserofthequerytable.Ifyoudonotselect
BrowseResults,MapInfoProstillcreatesthetemporaryquerytablebutdoesnotdisplayit.If
youwantedtodisplaythetableafterthefact,choosetheBrowseoptionintheWindowmenu
andselectDENSITYfromthedrop-downlist.
17.TodisplaythequeryresultsinthecurrentlyactiveMapwindow,selectFindResultsinCurrent
MapWindow.IftherearenoopenMapwindows,thischeckboxisdisabled.Youcannotsave
thischeckboxsettingtoatemplate.Thisoptionisclearedbydefault.
18.ClickOKtocreatethefollowingtable.
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Thefirstcolumncontainsthecountryname.Thesecondcolumncontainsthepopulationdensity.
Notethatthecountriesarelistedinalphabeticalorder(OrderBy:Country)andthepopulation
densityforeachcountrylistedisover500peoplepersquaremile(pop_1994/Area(obj,"sqmi")
>500).
Example2-ComputingPopulationDensitywithSQL
TosetupanSQLSelectstatementthatselectsonlythosestateswithahighpopulationdensity,do
thefollowing:
1. OntheFilemenu,clickOpenTableandopentheSTATEStableinaMapwindow.
2. OntheQuerymenu,clickSQLSelectandfillintheSQLSelectdialogbox.
•SelectColumns:*
•fromTables:States
•whereCondition:(Pop_1990 / Total_Area) > 500
•intoTableNamed:HIDENSITY
Thiscreatesanewtable,HIDENSTY,thatcontainsonlythosestateswitharelativelyhigh
populationdensity(populationdividedbytotalarea).Theasterisk(*)intheSelectColumnsbox
transfersallofthecolumnsintheSTATEStabletotheHIDENSTYtable.
3. OntheFilemenu,clickSaveCopyAsandsavetheSelectiontable.Thetablecanbesaved
withanyfilename.
TheHelpSystemcontainstheserelatedtopics:
•ExamplesofGroupbyColumns
•Example-UsingtheGroupbyColumnsFieldtoSubtotaltheResultsTable
•Example-UsingtheOrderbyColumnsFieldtoSorttheResultsTable
SavingQueries
AnyquerycreatedusingtheSelectorSQLSelectcommandscanbesavedasaMapInfoProquery
table.Querytablesconsistofa.tabfileanda.QRYfile.AfteryouhaveexecutedaSelectorSQL
Selectstatement,ontheFilemenu,clickSaveQuerytosavethequeryasatable.Whenyouopen
thistable,thetablesonwhichthequeryisbasedarere-openedandthequeryisre-executed.
Queriesmadeagainstotherqueriescannotbesavedasatableorinaworkspace.
Note:
SavingQueriestoWorkspaces
Youcanalsosavequeriesinworkspaces.Whenyouopenaworkspacethatcontainsaquery,the
querywillexecuteandanywindowscreatedbythequerywillredisplay.Unlikesavingaqueryasa
table,aseparate.tabfileisnotcreatedwhenyousaveaquerytoaworkspace.
Tosavequeriestoaworkspace,theSaveQueriesinWorkspacescheckboxmustbe
selectedintheStartuppreferences.MapInfoProselectsthischeckboxbydefault.
Note:
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ActivatingSaveQuerywhenUsingaWorkspace
ToactivatetheSaveQueryoptionwhenusingaworkspace,youmustactivatetheSaveQueries
inWorkspacesoptionintheStartupPreferencesdialogbox.
1. ChooseOptions>Preferences>Startup.TheStartupPreferencesdialogboxdisplays.
2. ChecktheSaveQueriesinWorkspacesoption(defaultsetting).
3. ClickOK.
Ifyouselectedthisoptionandopenaworkspace,theassociatedqueriesareregenerated.Aseparate
MapInfoProtable(.tab)fileforthequeriesisnotcreated.
OnlyqueriescreatedusingtheSQLSelectorSelectcommandsaresavedinaworkspace.
Note:
UsingDate-andTime-BasedDatainMapsandQueries
Ifyoumaintaintime-ordate/time-specificdata,youmaybeinterestedinqueryingthatinformation
anddisplayingitvisuallyinyourmaps.TimeandDateTimedatatypesletyoudisplaythatdata
thematicallyandaspartofaqueryanalysis.Youcouldusethisdatatypeformanytypesofprojects,
suchastodisplaycrimeinformationbasedonDateandTimeortopostschedulesbasedonresource
availabilityonaparticulardate.Also,youcanuseusethedateandtimedatafromAccess,Excel,
dBase,andremotedatabases.
TimeandDateTimedatatypesoptionsaremadeavailableinthelistsofyourQuerydialogboxes.
UsingTimeandTime/DateDataTypes
Youcanconvertexistingfieldswithtimeortime/dateinformationintoTimeandTime/Dateformats,
soyoucanusethemforqueryingandthematicmaps.
Toconvertyourdata:
1. OpenthedatayouwanttoconvertinMapInfoPro.
2. ChoseTable>Maintenance>TableStructureandselectthetableforwhichyouwantto
changethedatatype.TheModifyTableStructuredialogboxdisplays.
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3. TochangetheArrivalTimefieldfromacharacterfieldtoaTimefield,clicktheTypedrop-down
arrowandselecttheTimetype.
4. ClickOKtosaveyourchange.
AddingTimeorDateTimeDataTypestoExistingData
IfyouhaveexistingdataandwanttoaddTimeorDateTimecontenttoit,checkthefollowingtable
toensurethatthedataisinaformatthatMapInfoProcanrecognizeasTimeorDateTime.
Table1:TimeandDateTimeDataFormats
ToFormatforDateTime
ToFormatforTime
Enter
yyyyMMdd
NotApplicable.
Date
SetsvaluetothespecifiedDateatmidnight.
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ToFormatforDateTime
ToFormatforTime
Enter
HHmmssfff
HHmmssfff.
Time
SetsvaluetocurrentdateatspecifiedTime.
CanalsousethelocalesettingsforDateand
Timestringsseparatedbyaspace.
CanalsousethelocalesettingsforaTime
string.
yyyyMMddHHmmssfff
yyyyMMddHHmmssfff
SetsvaluetoTimeportionofDateTimevalue.
DateTime
where:
HHreferstohours,mmreferstominutes,ssreferstoseconds,ffreferstofractionsofseconds,
yyyyreferstoyears,MMreferstomonth,ddreferstodate
ConvertingExistingDatatoTimeorDateTimeDataTypes
IfyouhaveTimeorDateTimedatainyourtablesalready,checktoseeifitisintheformatyouwant
bycheckingtheTimeandDateTimeDataFormats.Ifyouhavealotofdataanditisnotinthe
formatyourequireforyourtasks,youcanuseoneoftheMapBasicconversionfunctionstoassist
youwiththisprocess.
DateTime
Time
Date
Converting
Stringcanbeintheform
yyyyMMddHHmmssffforcanuse
Stringcanbeintheform
HHmmssffforcanusethelocale
settingsforaTimestring.**
AssumestheformyyyyMMddor
localesettingsforadatestringif
Dateformatis"local"ortheU.S.
formifDateformatis"US".*
String
thelocalesettingsforDateand
Timestringsseparatedbya
space.***
Assumestheform
yyyyMMddHHmmssfff.Ifany
AssumestheformHHmmssfff.If
anyportionoftheTimeisinvalid
AssumestheformyyyyMMdd.If
anyportionoftheDateisinvalid
Number
portionoftheDateTimeisinvalid
thevalueissettonullanddisplay
thevalueissettonull.May
thevalueissettonullanddisplay
thiserror:"Couldnotconvert
data."
displaythiserror:"Couldnot
convertdata."
thiserror:"Couldnotconvert
data."
SetsvaluetothespecifiedDate
atmidnight.
Setsvaluetonullanddisplaythis
error:"Couldnotconvertdata."
Noconversion
Date
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DateTime
Time
Date
Converting
Setsvaluetocurrentdateat
specifiedTime.
Noconversion
Setsvaluetonull.Maydisplay
thiserror:"Couldnotconvert
data."
Time
Noconversion
SetsvaluetoTimeportionof
DateTimevalue.
SetsvaluetoDateportionof
DateTimevalue.
DateTime
AdditionalNotesforConvertingaString
*toaDate
IftheyearislastinthecurrentDateformat,youcanomititandMapInfoProwillassumethecurrent
year.Ifthedataspecifiesatwo-digityear,MapInfoProassignsthecenturybasedonthecurrent
DateWindow.IftheDateisinvalidthevalueissettonullandMapInfoPromaydisplaytheerror,
"Couldnotconvertdata."
**toaTime
MapInfoProacceptsbothmilitaryandAM/PMforms.ThedatacanspecifytheentirelocaleinAM
orPMstringsorusejustthefirstcharacterofeach.Thedatamayomitthemilliseconds,seconds,
andminutesifthelower-orderportionsarealsoomitted.IftheTimeisinvalidthevalueissettonull
andMapInfoPromaydisplaytheerror,"Couldnotconvertdata."
***toaDateTime
TheconversionrulesforDateandTimeapplyfortherespectiveportionsofthestring.Ifthedata
omitstheTimeportion,MapInfoProassumesmidnight.IftheDateTimeisinvalidthevalueisset
tonullandMapInfoPromaydisplaytheerror,"Couldnotconvertdata."
AdditionalNotesforConvertingaNumbertoaString
#TheconversionrulesforDateandTimeapplyfortherespectiveportionsofthestring.Ifthedata
omitstheTimeportionMapInfoProassumestheTimeismidnight.IftheDateTimeisinvalidthe
valueissettonullandMapInfoPromaydisplaytheerror,"Couldnotconvertdata.".
Ifyouhavealotofdataanditisnotintheformatyourequireforyourtasks,youcanuseoneofthe
MapBasicconversionfunctionstoassistyouwiththisprocess.
CreatingaDateTimeColumnfromTwoSeparateColumns
TocreateaDateTimecolumnfromaDatecolumnandaTimecolumn:
1. OpenyourdatainMapInfoProBrowserwindow.WeuseCrimeActivity.TABfromtheIntroductory
DataonyourDVD.
2. ChooseTable>Maintenance>TableStructuretodisplaytheModifyTableStructuredialog
box.
3. ClickAddFieldandtypeaDate_TimelabelintheNamefield.
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4. SelectDate/TimeintheTypedrop-downlistandclickOK.
5. SelectTable>UpdateColumntodisplaytheUpdateColumndialogbox.
6. SelectthetablenameintheTabletoUpdatedrop-downlist.
7. SelectthenameofthenewcolumnyoujustcreatedintheColumntoUpdatedrop-downlist.
8. SelectthetablenameagainintheGetValuefromTabledrop-downlist.
9. ClicktheAssistbuttontodisplaytheExpressionsdialogbox.
10.UsetheColumndrop-downlisttocreatethefollowingexpressionandclickOK:
DateColumnName + TimeColumnName
FormoreaboutusingmathexpressionswithTimeandDateinformation,seeUsingArithmetic
OperatorswithTimeandTime/DateDataTypes.
1. ClickOKtoupdatethenewcolumnwiththeDateandTimeinformation.
CreatingThematicMapsusingTimeandTime/DateDataTypes
Forrangedthematicmaps,Timevalueswillbeabletoberoundedbyseconds,minutes,andhours.
Thedefaultisseconds.WhenyouselectNone,MapInfoProdoesnotroundtheelectingtheseconds
anddisplaysagranularityofmilliseconds.
Ifyourdataisonaremotedatabase,youmaybeinterestedintheTimeandDateTimeData
TypeSupportforRemoteDatabasesintheHelpSystem.
Note:
TocreateathematicmapusingDateTimeinformation:
1. OpenyourdatainMapInfoProBrowserwindow.Usetheappropriatebackgroundmaptogive
yourdataperspective.HereweusetheGreatBritaindataintheIntroductoryDataontheMapInfo
ProDVD.
2. ChooseQuery>SQLSelecttodisplaytheSQLSelectdialogbox.
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3. PlaceyourcursorinthefromTablesfieldandselectthetablenamethatcontainstheDateTime
datainthefromTablesdrop-downlist.ForourexampleweusedtheCrimeActivitytable.
4. TofindoutthelocationofcrimesbetweenApril10,2003andApril10,2004andbetweenthe
hoursof12and8p.m.,weenteredthistextinthewhereConditionbox:
Crime_Date between "04/10/2003" and "04/10/2004" And Crime_Time between
"12:00:00 PM" and "08:00:00 PM"
1. SelecttheBrowseResultsandFindResultsinCurrentMapWindowcheckboxestodisplay
theresults.
2. ClickOKtocreatethequeryanddisplaytheresults.
UsingArithmeticOperatorswithTimeandTime/DateDataTypes
YoucanusetheadditionandsubtractionoperatorswiththeTimeandTime/Datedatatypesas
follows:
Notes
Result
Datatype
Operator
Datatype
Thenumberrepresentsthenumberof
secondsbetweentwotimesasa
Number
Time
minus(-)
Time
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