6If A → B and B → C, then A → C by the rule of:ATransitivityBUnionCAugmentationDReflexivityView AnswerDiscussWorkspaceReportSaveEasy
7If A → B and B → C hold, which dependency follows by Armstrong's axioms?AA → CBC → ACC → BDB → AView AnswerDiscussWorkspaceReportSaveHard
8In Emp(emp_id, dept_id, dept_name) with key emp_id, dept_name depends on dept_id. This is a:ATransitive dependency (violates 3NF)BMultivalued dependencyCTrivial dependencyDPartial dependencyView AnswerDiscussWorkspaceReportSaveMedium
9A deletion anomaly means:ADeleting one fact unintentionally removes anotherBDeleted rows come backCDELETE needs a WHERE clauseDRows cannot be deletedView AnswerDiscussWorkspaceReportSaveEasy
10A relation is in BCNF if:AIt has no NULLsBIt is in 1NFCIt has a single-column keyDEvery determinant of a non-trivial functional dependency is a super keyView AnswerDiscussWorkspaceReportSaveEasy