The use of a double nested set of NOT EXISTS SELECT statements can be used to find rows that meet some specified condition for every row in a table.
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Q4: Database redesign is rarely needed because databases
Q6: Correlated subqueries can be used to verify
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
Q16: When using queries with EXISTS and NOT
Q17: Because EXISTS and NOT EXISTS are forms
Q18: In the database redesign process,it is often
Q19: A correlated subquery looks very different from
Q20: The continuous circular process of changes is
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