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Q9: _ _ exists when different versions of
Q28: Overlapping subtypes are subtypes that contain a
Q36: As long as two transactions,T1 and T2,access
Q44: A relationship exists when three entities are
Q56: requires that all operations of a transaction
Q59: To be considered minimally relational,the DBMS must
Q66: Data constitute the building blocks of information.
Q74: The "building blocks" of all spreadsheet simulation
Q74: In Oracle,the command is used to change
Q79: Why do we need to optimize a