Tutorial 3 Maintaining and Querying a Databasehome.ku.edu.tr/~mehmetgonen/indr481_fall2015/indr481_fall2015_t… · Datasheet view, you might want to temporarily remove certain fields

Microsoft Access 2013® ®

Tutorial3Maintainingand

QueryingaDatabase

XPXPXPObjectives• Session3.1– Find,modify,anddeleterecordsinatable– Hideandunhidefieldsinadatasheet–WorkintheQuerywindowinDesignview– Create,run,andsavequeries– Updatedatausingaquerydatasheet– Createaquerybasedonmultipletables– Sortdatainaquery– Filterdatainaquery

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XPXPXPObjectives(Cont.)• Session3.2– Specifyanexactmatchconditioninaquery– Useacomparisonoperatorinaquerytomatcharangeofvalues

– UsetheAndandOrlogicaloperatorsinqueries– Changethefontsizeandalternaterowcolorinadatasheet– Createandformatacalculatedfieldinaquery– Performcalculationsinaqueryusingaggregatefunctionsandrecordgroupcalculations

– ChangethedisplayofdatabaseobjectsintheNavigationPane

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XPXPXPMaintainingandQueryingaDatabase

• Case- ChathamCommunityHealthServicesUpdatingandRetrieving InformationAboutPatients,Visits, andInvoices

– Userwantstomakesureshehasup- to-datecontactinformation

– Theofficestaffalsomustmonitorbillingactivitytoensurethatinvoicesarepaidontimeandinfull

– Developnewstrategiesforpromotingservicesprovidedbytheclinic

– Analyzeotheraspectsofthebusinessrelatedtopatientvisitsandfinances

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XPXPXPMaintainingandQueryingaDatabase(Cont.)

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XPXPXPMaintainingandQueryingaDatabase(Cont.)

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XPXPXPUpdatingaDatabase• Updating,ormaintaining,adatabaseistheprocessof

adding,modifying,anddeletingrecordsindatabasetablestokeepthemcurrentandaccurate

• ModifyingRecords– Tomakeminorchanges,orselect thefieldvaluetoreplace itentirely

• TheF2keyisatogglethatyouusetoswitchbetween navigationmodeandeditingmode

– Innavigation mode,Access selects anentire fieldvalue. Ifyoutypewhileyouareinnavigationmode,yourtypedentryreplaces thehighlighted fieldvalue

– Ineditingmode,youcaninsertordeletecharacters inafieldvaluebasedonthelocationoftheinsertion point

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XPXPXPUpdatingaDatabase(Cont.)

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XPXPXPUpdatingaDatabase(Cont.)• HidingandUnhidingFields– WhenyouareviewingatableorquerydatasheetinDatasheetview,youmightwanttotemporarilyremovecertainfieldsfromthedisplayeddatasheet,makingiteasiertofocusonthedatayou’reinterestedinviewing

– TheHideFieldscommandremovesthedisplayofoneormorefields• Canbeespeciallyusefulinatablewithmanyfields

– TheUnhideFieldscommandredisplaysanyhiddenfields

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XPXPXPUpdatingaDatabase(Cont.)• FindingDatainaTable– Accessprovidesoptionsyoucanusetolocatespecificfieldvaluesinatable• TheFindcommandsearchesatableorquerydatasheet,oraform,tolocateaspecificfieldvalueorpartofafieldvalue

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XPXPXPUpdatingaDatabase(Cont.)• DeletingRecords– Todeletearecord,youneedtoselecttherecordinDatasheetview,andthendeleteitusingtheDeletebuttonintheRecordsgroupontheHOMEtabortheDeleteRecordoptionontheshortcutmenu

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XPXPXPIntroductiontoQueries• Accessprovidespowerfulquerycapabilitiesthatallowyoutodothefollowing:– Displayselected fieldsandrecords fromatable– Sortrecords– Performcalculations– Generate datafor forms, reports,andotherqueries– Updatedatainthetables inadatabase– Findanddisplaydatafromtwoormore tables

• Theanswertoaselectqueryisreturnedintheformofadatasheet– Theresultofaqueryisalsoreferred toasarecordset because the

queryproducesasetofrecords thatanswersyourquestion

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XPXPXPIntroductiontoQueries(Cont.)

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XPXPXPCreatingandRunningaQuery

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XPXPXPCreatingandRunningaQuery(Cont.)

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XPXPXPUpdatingDataUsingaQuery

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• Aquerydatasheetistemporaryanditscontentsarebasedonthecriteriainthequerydesigngrid• Youcanstillupdatethedatainatableusingaquerydatasheet

• Insteadofmakingthechangesinthetabledatasheet,youcanmaketheminthePatientEmailquerydatasheetbecausethequeryisbasedonthePatienttable

• TheunderlyingPatienttablewillbeupdatedwiththechangesyoumake

XPXPXPCreatingaMultitableQuery

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• Amultitablequeryisaquerybasedonmorethanonetable

• Ifyouwanttocreateaquerythatretrievesdatafrommultipletables,thetablesmusthaveacommonfield

XPXPXP

• Sortingistheprocessofrearrangingrecordsinaspecifiedorderorsequence– Sometimesyoumightneed tosortdatabefore displayingorprintingit

tomeetaspecific request

• Tosortrecords,youmustselectthesortfield,whichisthefieldusedtodeterminetheorderofrecordsinthedatasheet

SortingDatainaQuery

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XPXPXPSortingDatainaQuery(Cont.)

• WhenworkinginDatasheetviewforatableorquery,eachcolumnheadinghasanarrowtotherightofthefieldname– ArrowgivesyouaccesstotheAutoFilter feature,whichenablesyoutoquicklysortanddisplayfieldvaluesinvariousways

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XPXPXPSortingDatainaQuery(Cont.)• SortingonMultipleFieldsinDesignView– Sortfieldscanbeuniqueornonunique

• Asortfield isunique ifthevalueinthesort fieldforeachrecord isdifferent

• Asortfield isnonunique ifmore thanonerecordcanhave thesamevalue forthesortfield– Whenthesortfieldisnonunique, recordswiththesamesortfieldvaluearegrouped together, buttheyarenotsorted inaspecificorderwithinthegroup

– Toarrange thesegroupedrecords inaspecificorder,youcanspecifyasecondary sort field,whichisasecond fieldthatdetermines theorderofrecords thatarealreadysortedbytheprimary sort field(the firstsortfieldspecified)

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XPXPXPSortingDatainaQuery(Cont.)

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XPXPXPFilteringData• Afilterisasetofrestrictionsyouplaceontherecordsto

temporarilyisolateasubsetoftherecords– Letsyouviewdifferent subsetsofdisplayedrecords sothatyoucan

focusononlythedatayouneed– Anapplied filter isnotavailable thenexttimeyourunthequeryor

opentheform(unless ithasbeensaved)

• ThesimplesttechniqueforfilteringrecordsisFilterBySelection– Letsyouselectallorpartofafieldvalue inadatasheet orform,and

thendisplayonlythoserecords thatcontaintheselected value inthefield

– Another technique forfiltering records istouseFilterByForm,whichchangesyourdatasheet todisplayblankfields

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XPXPXPFilteringData(Cont.)

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XPXPXPSelectionCriteriainQueries

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XPXPXP

• TotellAccesswhichrecordsyouwanttoselect,youmustspecifyaconditionaspartofthequery– Aconditionusuallyincludesoneofthecomparisonoperators

DefiningRecordSelectionCriteriaforQueries

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XPXPXP

• SpecifyinganExactMatch– Createaquerythatwilldisplayspecificrecords

• Thistypeofconditionisanexactmatchbecause thevalue inthespecified fieldmustmatchtheconditionexactlyinorder fortherecord tobeincludedinthequeryresults

DefiningRecordSelectionCriteriaforQueries(Cont.)

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XPXPXP

• ModifyingaQuery– Afteryoucreateaqueryandviewtheresults,youmightneedtomakechangestothequeryiftheresultsarenotwhatyouexpectedorrequire

DefiningRecordSelectionCriteriaforQueries(Cont.)

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XPXPXPDefiningRecordSelectionCriteriaforQueries(Cont.)

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XPXPXP

• UsingaComparisonOperatortoMatchaRangeofValues– Afteryoucreateandsaveaquery,youcandouble-clickthequerynameintheNavigationPanetorunthequeryagain

– ClicktheViewbuttontochangeitsdesign– Youcanalsouseanexistingqueryasthebasisforcreatinganotherquery

DefiningRecordSelectionCriteriaforQueries(Cont.)

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XPXPXPDefiningRecordSelectionCriteriaforQueries(Cont.)

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XPXPXPDefiningMultipleSelectionCriteriaforQueries

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• Multipleconditionsrequireyoutouselogicaloperatorstocombinetwoormoreconditions– NeedtousetheAndlogicaloperator

– IfyouplaceconditionsinseparatefieldsinthesameCriteriarowofthedesigngrid,allconditionsinthatrowmustbemetinorderforarecordtobeincludedinthequeryresults

– Ifyouplaceconditionsindifferent Criteriarows,arecordwillbeselectedifatleastoneoftheconditionsismet

– Ifnoneoftheconditionsaremet,norecordsareselected– WhenyouplaceconditionsindifferentCriteriarows,youareusingtheOrlogicaloperator

XPXPXPDefiningMultipleSelectionCriteriaforQueries(Cont.)

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XPXPXPDefiningMultipleSelectionCriteriaforQueries(Cont.)

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• TheAndLogicalOperator• Inthequerydesign,bothconditionsyouspecifywillappearinthesameCriteriarow;therefore,thequerywillselectrecordsonlyifbothconditionsaremet

XPXPXPDefiningMultipleSelectionCriteriaforQueries(Cont.)

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• TheOrLogicalOperator• Inthequerydesign,eitheroneoftwoconditionsissatisfiedorwhenbothconditionsaresatisfied

XPXPXPChangingaDatasheet’sAppearance

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• Youcanmakemanyformattingchangestoadatasheettoimproveitsappearanceorreadability– Fonttype,size,color,alignmentoftext,applydifferentcolorstotherowsandcolumns

• ModifyingtheFontSize– Dependingonthesizeofthemonitoryouareusingorthescreenresolution,youmightneedtoincreaseordecreasethesizeofthefonttoviewmoreorfewercolumnsofdata

XPXPXPChangingaDatasheet’sAppearance(Cont.)

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• ChangingtheAlternateRowColorinaDatasheet– Accessusesthemestoformattheobjectsinadatabase.Athemeisapredefinedsetofformatsincludingcolors,fonts,andothereffectsthatenhanceanobject’sappearanceandusability• TheOfficetheme,whichformatseveryotherrowinadatasheetwithagraybackgroundcolortodistinguishonerowfromanother,isthedefault

XPXPXPChangingaDatasheet’sAppearance(Cont.)

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XPXPXPCreatingaCalculatedField

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• Queriescanperformcalculations– Mustdefineanexpressioncontainingacombinationofdatabasefields,constants,andoperators

– Acalculatedfieldisafieldthatdisplaystheresultsofanexpressionbutitdoesnotexistinadatabase

– TheZoomboxisadialogboxthatyoucanusetoentertext,expressions,orothervalues

– ExpressionBuilderisanAccesstoolthatmakesiteasyforyoutocreateanexpression• Itcontainsaboxforentering theexpression, anoptionfordisplayingandchoosingcommonoperators, andoneormorelistsofexpression elements, suchastableandfieldnames

XPXPXPCreatingaCalculatedField(Cont.)

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XPXPXPCreatingaCalculatedField(Cont.)

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FormattingaCalculatedFieldYoucanspecifyaparticularformatforacalculated field, justasyoucanforanyfield,bymodifying itsproperties

XPXPXPUsingAggregateFunctions

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• Youcancalculatestatisticalinformation,suchastotalsandaverages,ontherecordsdisplayedinatabledatasheetorselectedbyaquery– UsetheAccessAggregatefunctionswhichperformarithmeticoperationsonselectedrecordsinadatabase

XPXPXPUsingAggregateFunctions(Cont.)

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• WorkingwithAggregateFunctionsUsingtheTotalRow– Toquicklyperformacalculationusinganaggregatefunctioninatableorquerydatasheet,youcanusetheTotalsbuttonintheRecordsgroupontheHOMEtab• Whenyouclickthisbutton,arowlabeled“Total”appearsatthebottomofthedatasheet

• Chooseoneoftheaggregatefunctions

XPXPXPUsingAggregateFunctions(Cont.)

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• CreatingQuerieswithAggregateFunctions– Aggregate functionsoperateontherecords thatmeetaquery’s

selectioncriteria– Youspecifyanaggregate function foraspecificfield,andthe

appropriate operation appliestothatfield’svalues fortheselectedrecords

XPXPXPUsingAggregateFunctions(Cont.)

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XPXPXPUsingAggregateFunctions(Cont.)

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• UsingRecordGroupCalculations– Inaddition tocalculatingstatistical informationonallorselected

records, youcancalculatestatistics forgroupsofrecords– TheGroup Byoperatordivides theselected records intogroupsbased

onthevalues inthespecified field• Those recordswiththesamevalue forthefieldaregroupedtogether, andthedatasheet displaysonerecord foreachgroup

• Aggregate functions,whichappear intheothercolumnsofthedesigngrid,providestatisticalinformationforeachgroup

XPXPXPWorkingwiththeNavigationPane

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• TheNavigationPaneisthemainareaforworkingwiththeobjectsina– Provides optionsforgroupingdatabase objectsinvariouswaystosuit

yourneeds– Dividesdatabaseobjects intocategories, andeachcategorycontains

groups– Thedefault category is

ObjectType,whicharrangesobjectsbytype—tables,queries, forms,andreports

– ThedefaultgroupisAllAccessObjects,whichappearsatthetopoftheNavigationPane

XPXPXPWorkingwiththeNavigationPane(Cont.)

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