In the database redesign process,it is often useful to test whether certain conditions or assumptions are valid before proceeding with the redesign.
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Q13: In a correlated subquery,the DBMS must run
Q14: In a real sense,information systems and organizations
Q15: A continuous circular process of changes in
Q16: When using queries with EXISTS and NOT
Q17: Because EXISTS and NOT EXISTS are forms
Q19: A correlated subquery looks very different from
Q20: The continuous circular process of changes is
Q21: The NOT EXISTS keyword will be true
Q22: A means must be created to recover
Q23: Typically,there are at least four different copies
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