11A weak entity set is one that:ACannot participate in relationshipsBDoes not have a primary key of its own and depends on an owner entityCHas only one rowDHas no attributesView AnswerDiscussWorkspaceReportSaveEasy
12An attribute whose value is computed from other attributes (e.g. age from date of birth) is:AMultivaluedBCompositeCSimpleDDerivedView AnswerDiscussWorkspaceReportSaveEasy
13A many-to-many relationship between Students and Courses is implemented in a relational database by:AA separate table holding foreign keys to bothBA foreign key in Students onlyCA foreign key in Courses onlyDMerging the two tablesView AnswerDiscussWorkspaceReportSaveMedium
14Which data model organises records in a tree of parent–child links?ANetwork modelBHierarchical modelCRelational modelDObject modelView AnswerDiscussWorkspaceReportSaveEasy
15Generalisation in an EER model:ACombines lower-level entity sets into a higher-level setBCreates weak entitiesCSplits an entity set into subsetsDRemoves attributesView AnswerDiscussWorkspaceReportSaveEasy