Database redesign is rarely needed because databases are usually built correctly the first time.
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Q1: Although correlated subqueries are useful in database
Q2: A doubly nested set of NOT EXISTS
Q3: In a correlated subquery,the same table is
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
Q10: In the database redesign process,two SQL tools
Q11: There is a common trap in writing
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