Which of the following statements is correct? (refer to the tables in the JustLee Books database.)a. The IN comparison operator can’t be used with a subquery that returns only one row of results.b. The equals (=) comparison operator can’t be used with a subquery that returns morethan one row of results.c. In an uncorrelated subquery, statements in the outer query are executed first, and thenstatements in the subquery are executed.d. A subquery can be nested only in the outer query’s SELECT clause.

Oracle 12c: SQL
3rd Edition
ISBN:9781305251038
Author:Joan Casteel
Publisher:Joan Casteel
Chapter12: Subqueries And Merge Statements
Section: Chapter Questions
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Which of the following statements is correct? (refer to the tables in the JustLee Books database.)
a. The IN comparison operator can’t be used with a subquery that returns only one row of results.
b. The equals (=) comparison operator can’t be used with a subquery that returns more
than one row of results.
c. In an uncorrelated subquery, statements in the outer query are executed first, and then
statements in the subquery are executed.
d. A subquery can be nested only in the outer query’s SELECT clause.

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