A relational query optimizer ____.
A) is a form of a relational catalog
B) is a separate piece of software that can be added to the relational DBMS environment as an option
C) can be invoked at the option of the user issuing the query
D) is only used with queries involving joins
E) None of the above.
Correct Answer:
Verified
Q28: The SQL SELECT ORDER BY operator _.
A)
Q29: The SQL SELECT LIKE operator _.
A) involves
Q30: In a merge-scan join _.
A) neither of
Q31: When an SQL SELECT command has a
Q32: A relational query optimizer optimizes _.
A) the
Q34: A subquery can be used in place
Q35: The SQL SELECT command is used to
Q36: The SQL SELECT GROUP BY clause is
Q37: The SQL SELECT command is capable of
Q38: The SQL SELECT DISTINCT operator _.
A) eliminates
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