单项选择题
You want to implement a master-detail relation between data blocks based on object tables. How would you do this? （）
A.Create the relation manually and coordinate the blocks using triggers.
B.Base the relation on a REF pointer using the Data Block Wizard.
C.Base the relation on a foreign key using the Data Block Wizard.
D.This task is not possible because master-detail relations can be implemented only for blocks based on relation tables.
相关考题
-
单项选择题
AsalesanalystreviewsthefirstdraftonyourSalesapplication,andrequeststhattheapplicationgraphicallyrepresentrevenuegeneratedforeachsalesrepresentative,inadditiontothetextualdatacurrentlydisplayedfortheORDERblock.Howwouldyouincorporatethisgraphicinyourform?（）
A.Invoke the Chart Wizard and create a chart based on the ORDER block.
B.Create a chart using Graphics Builder and then select File Import Chart in Form Builder, positioning the new chart with the text items in the ORDER block.
C.Invoke the Data Block Wizard in reentrant mode, select the Charts tab, and specify the chart type and column sources for the X and Y axes.
D.Select the Chart node in the Object Navigator, Click the Create icon, and specify the details of the chart in the chart's Property Palette. -
单项选择题
Youarebuildingtwoforms.Eachformhasabuttonandanon-basetablefield.Whenthebuttonispressed,acomplicatedcalculationisexecuted.Thecalculationisthesameforbothforms.The calculationcodedoesnotqueryorchangethedatainthedatabase.Whenthecalculationcompletes,itreturnsasinglevaluetothenon-basetablefield.Tooptimizeperformanceandmaintainability,whichPL/SQLstructureshouldbeused?（）
A.A trigger in each form.
B.A subprogram in each form.
C.A stored subprogram in the database.
D.A subprogram in a library that is attached to each form. -
单项选择题
Thesystemanalystshaverequestedheavyuseofobjectfeatures.ThedatabasedesignmakesuseofPL/SQL8objecttypes,methods,andLOBtypes.Howdoyouworkwiththesefeaturesontheclient?（）
A.Write client-side subprograms containing the PL/SQL8 constructs, and move them into an object group.
B.Write server-side subprograms, and call the subprograms from the form application.
C.Store the PL/SQL8 constructs in a PL/SQL library, and attack the library to each form muddle in your application.
