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• Formoreinformation,seeMergingMapsusingtheDragMapWindowToolandMergingMapsfrom
LayerControlintheHelpSystem.
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Chapter8:DrawingandEditingObjects
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9
Selecting and Querying Data
Thischapterpresentstheinsandoutsofselectingrecordsfromtables.Asyou
useMapInfoProfessionalyouwillfindyourselfselectingrecordsquiteoften.This
chaptercoversanoverviewofselectingandqueryingmethodsusingtoolsfrom
theMaintoolbar.
Inthissection:
• SelectingYourDatainMapInfoProfessional . . . . . . . . .224
• QueryingYourDatainMapInfoProfessional . . . . . . . . .231
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Selecting Your Data in MapInfo Professional
WhileMapInfoProfessionalallowsyoutoattachdatatoobjectsonamap,itstrueanalyticalpowerisits
abilitytogroupandorganizedata.Onceyourdataisbrokendownintologicalgroups,youcananalyze
itbasedononeormorevariables.
Forexample,youhaveabasketoffruit.Youwanttoorganizethefruitintodifferentcategories,based
ononeormorevariables:
• Putalltheapplesintoonegroup
• Putallthecitrusfruitintoonegroup(oranges,lemons,grapefruit)
• Putallthefruitthatbeginswithavowelintoonegroup(oranges,apples,apricots)
Therearemanydifferentwaysthatyoucouldgroupthefruit.Somefruitwouldfallintomorethanone
category(orangesarecitrusfruitandalsobeginwithavowel).Youcouldalsousemorethanonevariable
togroupyourfruit-putallthecitrusfruitthatbeginswithavowelintoonegroup.
MapInfoProfessionalcanretrieveinformationorevenindividualrecordsfromwithinyourdata.Werefer
totherecordorrecordsthatareretrievedthiswayasselections.Aselectionisasubsetofdatathathas
beencollectedbasedononeormorevariables.
Forexample,youhaveatableofcustomerrecords.Youcouldcreateasubsetofallcustomerswholive
withina50mileradiusofPrague.Or,youcouldcreateasubsetofallcustomerswhopurchasedover
$1000ofmerchandise.Or,youcouldcreateasubsetofallcustomerswhoselastnamebeginswiththe
letter"B".
Thestatementsaboveusedtocreatethesesubsetsareknownasqueries.Aqueryisjustanotherword
foraquestion-whichofmycustomersspentmorethan$1,000?Whichofmycustomersliveswithin50
milesofPrague?
Aswiththefruitexample,therearemanydifferentwaystogroupyourdata.Somedatarecordswill
obviouslyfallintomorethanonecategory.Youcouldalsousemorethanonevariabletogroupyour
data.Whichofmycustomersliveswithin50milesofPragueandpurchasedover$1000ofmerchandise?
Thissectiongivesyousomeexamplesandsomepracticalapplicationsof"selecting"inMapInfo
Professional.
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CharacteristicsofSelections
Selectionsaretemporarytables.Whenyoumakeaselection,MapInfoProfessionalcreatesthistemporary
table(calledaselection)tostoretherecordsyouhaveselected.
Youcanperformmanyofthetaskswithaselectiontablethatyoucanperformwithapermanent(base)
tablesuchas:
• ViewitinaBrowser,aMap(ifithasgraphicobjects),aGraph,classicLayoutwindow,oraLayout
Designerwindow.
• Cutandcopyitintotheclipboardandpasteitintoanothertable,orevenintoanotherapplication.
• Useittoeditatable.Ifyouwanttoeditonlycertainrecordsinatable,youcangetthoserecordsinto
aselectionandtheneditthatselection.
• Makeafurtherselectionfromit.
Toconvertselectionsintopermanenttables,ontheFilemenu,clickSaveCopyAs.Onceyouhave
savedthetemporaryselectiontableasapermanenttable,youcantreatthenewtablelikeanyother
table.Selectiontablesaretotallydependentonthetablefromwhichtheywerecreated.Ifyouclosea
basetable,allassociatedselectiontablesaredeleted.
SelectionCommandsandToolDescriptions
MapInfoProfessionalgivesyouanumberofcommandsandtoolsformakingselections.Theyfallinto
twocategories:
• Selectingfromthescreen:Selecttool,RadiusSelecttool,BoundarySelecttool,PolygonSelecttool,
MarqueeSelecttool,InvertSelectiontool,SelectAllcommand.Toselectrecordswiththetools,click
orencircletheassociatedgraphicobjects.Toselectrecordsfromalayeratthesametime,onthe
Querymenu,clickSelectAll.Or,selectalayeronthemap,right-clicktodisplaythecontextpop-up
menu,andselectSelectAllfromSelectedLayer.
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• Selectingwithqueries:Select,SQLSelect.Whenyouselectrecordswitheitherofthesemethods,
youcreatealogicalexpressionthatMapInfoProfessionalusestoselecttherecords.Forexample,
theexpressionSALES>20000meansthatMapInfoProfessionalwillselectonlythoserecordswith
saleshigherthan$20,000.WediscussSelectandSQLSelectinmoredetailinUsingSelecttoCreate
QueriesandUsingSQLSelecttoQueryData).
ToimportaGMLfile:
1. ChooseTable>ImporttodisplaytheImportFiledialogbox.ChooseOSMasterMap(*.GML)from
theFilesoftypedrop-downlistandnavigatetoitslocation.
2. SelectaGMLfiletoimport.ClickOpen.TheGMLImportdialogboxdisplays.
SelectingfromtheScreen
Toselectobjectsfromthescreen,thelayerthatcontainstheobjectsmustbeSelectable.Tomakea
layerselectable,ontheMapmenu,clickLayerControl.IntheLayerControlwidow,clicktheSelectable
icontomakethelayerselectable.
WhenyouselectmapobjectsinaSelectablelayer,MapInfoProfessionalhighlightstheobjectsusing
thesettingsdefinedintheHighlightControlsectionofthePreferencesdialogbox(Optionsmenu).
WhenyouselectmapobjectsinanEditablelayer,MapInfoProfessionalplacesedithandles(small
squares)aroundtheextentsoftheobjectyouselected.
IfyouhavemorethanoneSelectablelayerinaMapwindow,MapInfoProfessionalselectsobjectsfrom
thetopmostSelectablelayer.
Forexample,youhaveaSelectablelayerofcountyboundariesandaSelectablelayerofstateboundaries.
IfthecountyboundariesareinthetopmostlayerintheMapwindow,MapInfoProfessionalselectsobjects
fromthecountylayer.IfthestateboundariesareinthetopmostlayerintheMapwindow,MapInfo
Professionalselectsobjectsfromthestateslayer.WhenyouusetheSelecttool,MapInfoProfessional
alsodisplaysInfoTipsforthetopmostSelectablelayer.Asyoumoveyourcursorovertheobjects,InfoTips
displaytheobject'slabelexpression.YoucanturnofftheInfoTipsintheMapwindowPreferences(on
theOptionsmenu,pointtoPreferencesandclickMapwindow).
Likewise,ifyouperformaboundarysearch,theboundaryobjectthatyouwanttosearchshouldbein
thetopmostlayer.
Forexample,youhavealayerofpostalcodeboundariesandalayerofstateboundaries.Ifyouwant
toselectallobjectsthatfallwithinapostalcodeboundary,thepostalcodelayershouldbethetopmost
boundarylayer.Ifyouwanttoselectallobjectsthatfallwithinagivenstate,thestatelayershouldbe
thetopmostboundarylayer.YoucanreorderthelayersbyselectingtheMapmenu,andclickingLayer
Control.
Youcanselectobjectsfromtablesotherthanthetopmosttable,byholdingdowntheCtrl
keywhenyou
areselectinganobject.Forexample,sayyouhavethreeselectablelayers,suchasSTATES,COUNTIES,
andCITIES.IfyouwanttoselectobjectsintheSTATEStable,butitisthebottomlayerintheMap
window,dothefollowing:
1. HolddowntheCtrl
keyandclickthemapwiththeSelecttool.Youarenowinthesecondlayer.
2. HolddowntheCtrl
keyandclickthemapagainwiththeSelecttool.Youarenowselectingobjects
fromthethirdlayer,theSTATESlayer.
SelectingaSingleObjectfromaMaporLayout
MakingselectionsisabasicMapInfoProfessionaloperation,usingtheSelecttoolisonlyonewayof
makingselections.
Thetoolmustbeactivebeforeyoucanuseit;activatethetoolbyclickingonit.Thetool'siconis
highlightedintheMaintoolbarandthecursorbecomesapointer.Ifyouareeditingrecordsinabrowser,
thecursorbecomesanI-beam.
Toselectasingleobjectfromamaporanactivemapinalayout:
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1. ClicktheSelect
buttonintheMaintoolbar.
2. Clicktheobject.
ThelayerwheretheobjectislocatedhastobeselectableintheMapwindow.Whenanobjectisselected
itishighlightedaccordingtothesettingsyouspecifiedinOptions>Preferences.
• Whenthelayeriseditable,theselectedobjectissurroundedbyedithandlesandiscoloredand
patternedasitwasoriginallydefined.
• Whenyouselectanotherobject,thefirstobjectisunselected.
• Toselectanumberofobjectsfromamaporanactivemapinalayout,holdtheShift
keydownand
clickthedesiredobjectswiththeSelecttool.
SelectingTools
MapInfoProfessionalincludesseveraltoolsontheMaintoolbartoallowyoutochooserecordsforfurther
viewingandanalysis,includingtheSelecttool,RadiusSelecttool,MarqueeSelecttool,PolygonSelect
tool,BoundarySelecttool,andInvertSelectiontool.Eachtoolisdiscussedinthenextsection.
UsingtheSelectTool
UsetheSelect
tooltoselectobjectsoneatatimeortoselectallobjectsthataregenerallyinthe
sameareaoftheMapwindow.Youselectanobjectbyclickingitusingthemouse.
ToselectanobjectusingtheSelecttool:
ToselectanobjectusingtheSelecttool:
1. Makethelayerthatyouwanttoselectobjectsfromselectable.OntheMapmenu,clickLayerControl
andclicktheSelectable
iconforthelayer.
2. ChoosetheSelectbuttonfromtheMaintoolbar.
3. ClickanobjectintheMapwindow.Ifthatobject'slayerisselectable,MapInfoProfessionalhighlights
theobject.Ifthelayeriseditable,MapInfoProfessionalputsedithandlesaroundtheextentsofthe
object.Ifthelayerisneithereditablenorselectable,MapInfoProfessionaldoesnotallowyouto
selecttheobject.
4. OntheWindowmenu,clickNewBrowserWindowtodisplayselectedrecordsinaBrowser.Choose
Selectionfromthelistoftables.MapInfoProfessionalcreatesaBrowserofthenewtemporarytable.
ToselectrecordsfromtheBrowser,simplyclickeachrecordwiththeSelecttool.
ToselectmultipleobjectsindividuallyinaMapwindow:
1. Clickthefirstobjecttoselectit.
2. HolddowntheShift
keyandclickanotherobject.MapInfoProfessionalselectsthatobject,too.If
youselectasecondobjectwithoutholdingdowntheShift
key,MapInfoProfessionalunselectsthe
firstobjectandselectsthesecondobject.
3. Foradditionalinstructions,seeSelectingtheNextSelectableObjectBeneaththeCurrentObjectin
theHelpSystem.
UsingtheUnselectAllTool
UsetheUnselectAll
tooltodeselectalloftheselectedobjects.Youusethismostoftenwhenyou
haveselectedtoomanyobjectsandwanttostartover.
ToselectanobjectusingtheSelecttool:
ChoosetheUnselectAllbuttonfromtheMaintoolbar.
DeselectingObjectsandRemovingObjectsfromtheSelection
Todeselect:
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• AnobjectorremoveitfromtheselectioninaMapwindow,presstheShift
keywhileclickingon
theobject.Whenyouclick,theobjectisremovedfromtheselectionset.
• Allobjects,ontheQuerymenupointtoUnselectAll,orclickonthemapwherethereareno
objects.
Foradditionalinformation,seeMovingSelectedObjectsandRotatingSelectedObjectsintheHelp
System.
UsingtheRadiusSelectTool
TheRadiusSelect
toolselectsallobjectsthatfallwithinagivenradius.Forexample,youhavea
tableofblooddonorsandatableofblooddonationsites.UsingtheRadiusSelecttool,youcouldcreate
atemporarylistofblooddonorsthatlivewithinaone-half-mileradiusofeachblooddonationsite.
TheRadiusSelecttoolselectsallobjectswhosecentroidfallswithinthecircle.Theobjectdoesnothave
tobecompletelyboundedbythecircle.
Toselectobjectswithinaradius:
1. Makethelayeryouwanttoselectobjectsfromselectable.OntheMapmenu,clickLayerControl
andclicktheSelectable
iconforthelayer.Makesurethelayeriseitheratthetopofthelist,or
thatthelayersabovetheylayeryouwantarenotselectable.
2. ChoosetheRadiusSelecttoolfromtheMaintoolbar.Thecursorbecomesahandwhenmoved
overtheMapwindow.
3. Clickaplaceonthemapthatyouwouldliketouseasthecenterpointofyourradiussearch.For
example,ifyouwanttoselectallthehomesofallofthechildrenthatlivewithinthreeblocksofthe
school,clicktheschooliconandusethatasthecenterpoint.
4. Holddownthemousebuttonanddragthemouseawayfromthecenterpoint.MapInfoProfessional
drawsacirclearoundthepointandreportstheradiusofthecircleintheStatusBar(lowerleftcorner
ofthescreen).
5. Whenyouhavethedesiredradiusreleasethemousebutton.MapInfoProfessionalhighlightsall
mapobjectsthatfallwithinthatcircle.
6. Toseealistofalltherecordsthatfallwithinthatcircle,chooseNewBrowserWindowfromthe
Windowmenu.ChooseSelectionfromthelistoftables.MapInfoProfessionalcreatesaBrowser
ofthenewselectiontable.
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UsingtheMarqueeSelectTool
TheMarqueeSelect
selectsobjectswithinarectangle.ByclickinganddraggingusingtheMarquee
tool,youcreateadottedrectangle,ormarqueeboxaroundobjectsyouwanttoselect.AllSelectable
objectsinthetopmostSelectablelayerwillbeincludedinthemarqueebox.
Toselectobjectsfromanotherlayer,youmustturnoffselectableinLayerControlfortheupper
layers.Onlyobjectsfromonelayeratatimeareselected.
Note:
Toselectobjectswithinarectangle:
1. Makethelayerthatyouwanttoselectobjectsfromselectable.OntheMapmenu,clickLayerControl
andclicktheSelectable
iconforthelayer.
2. ChoosetheMarqueeSelecttoolfromtheMaintoolbar.Thecursorbecomesahandwhenmoved
overtheMapwindow.
3. Clickaplaceonthemapoutsideoftheareayouwanttoincludeinthemarqueebox.
4. Holddownthemousebuttonanddragthemousetoformadottedrectanglearoundthepointsyou
wanttoselect.
5. Whenyouhavereachedthedesiredrectanglesize,releasethemousebutton.MapInfoProfessional
highlightsallmapobjectsthatfallwithinthatrectangle.
6. Toseealistofalltheselectedrecords,ontheWindowmenu,clickNewBrowserWindow.Choose
Selectionfromthelistoftables.MapInfoProfessionalcreatesaBrowserofthenewselectiontable.
AddingObjectstotheSelectionSet
UsetheShift
keywiththeMarqueeSelecttoolwhenyouwishtoaddnewlyselectedobjectstothe
previousselection.
UsingthePolygonSelectTool
ThePolygonSelect
toolselectsmapobjectswithinapolygonthatyoudrawonamap.
ToselectobjectswiththePolygonSelecttool:
1. Makethelayerthatyouwanttoselectfromselectable.OntheMapmenu,clickLayerControland
clicktheSelectable
iconforthelayer.
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2. ChoosethePolygonSelecttoolfromtheMaintoolbar.Thecursorbecomesapointinghandwhen
movedovertheMapwindow.
3. Clickthemaplocationatwhichyouwanttoplacethefirstendpointofthepolygon.Movethecursor
overyourmapinanydirection.MapInfoProfessionaldrawsalinefromthepointwhereyouclicked
tothecursor.
4. Clicktocreateanotherendpoint.Continuetomovethecursorandclickuntilyouhavethedesired
numberofsidestoyourpolygon.
5. Toclosethepolygon,makeyourlastclickascloseaspossibletothefirstclick.MapInfoProfessional
closesthepolygonandselectstheobjectsthatarewithinit.
PressShift
whileusingthePolygonSelecttooltoaddnewlyselectedobjectstotheprevious
selection.
Note:
UsingtheBoundarySelectTool
TheBoundarySelect
toolselectsobjectsthatfallwithinagivenregionorboundary.Whenyouuse
thistool,MapInfoProfessionalselectsallobjectswithinanyboundaryonthemap,suchasstateor
countyboundaries,policeprecincts,orsalesterritories.
Forexample,youhavealayerofstatesandalayerofretailers.UsingtheBoundarySelecttool,you
couldclickastateandcreateatemporarylistofalltheretailersinthatstate.
Toselectobjectswithinaregion:
1. Makethelayerthatyouwanttoselectobjectsfromselectable.OntheMapmenu,clickLayerControl
andclicktheSelectable
iconforthelayer.
2. ChoosetheBoundarySelecttoolfromtheMaintoolbar.Thecursorbecomesacrosshairwhen
movedovertheMapwindow.
3. Clickwithinaboundaryobject.MapInfoProfessionalselectsallobjectsthatfallwithinthatboundary.
4. Toseealistofalltherecordsthatfallwithinthatboundary,ontheWindowmenupointtoNew
BrowserWindow.ChooseSelectionfromthelistoftables.MapInfoProfessionalcreatesaBrowser
windowwiththenewselectiontable.
UsingtheInvertSelectionTool
TheInvertSelection
toolisaconvenientwaytoselectmanyobjectsatonce.Yousimplyselect
thefewobjectsthatyoudonotwant,andtheninverttheselectiontoselectalltheobjectsyoudowant.
1. Makethemaplayerthatyouwanttoselectfromselectable.OntheMapmenu,clickLayerControl
andclicktheSelectable
iconforthelayer.
2. MaketheSelecttoolactive,andclickoneortwomapobjects.
3. ClicktheInvertSelectiontool.MapInfoProfessionalselectsalltheobjectsthatarenotpartofthe
currentselection,andcancelsthecurrentselection.YoucanalsofindInvertSelectionintheQuery
menu.
UnselectingObjectsorRecords
Youmaychooseto:
• Unselectoneobjectorrecordfromagroupofselectedobjectsorrecords.
• Unselectagroupofselectedobjectsorrecords.
• Unselectallselectedobjects.
TocanceltheselectionofarecordfromagroupofselectedrecordsinaBrowerwindow,presstheCtrl
keywhileselectingrecords.
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