In the database redesign process,two SQL tools are useful for testing whether or not certain conditions or assumptions are valid: uncorrelated subqueries and EXISTS/NOT EXISTS.
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Q5: The use of a doubly nested set
Q6: Correlated subqueries can be used to verify
Q7: In the SQL statement:
SELECT S1.CustName,S1.SalesRepNo FROM SALES
Q8: EXISTS and NOT EXISTS are actually just
Q9: In a correlated subquery,the DBMS can run
Q11: There is a common trap in writing
Q12: Database redesign is equally difficult whether or
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
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