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97. Which two statements are true regarding subqueries? (Choose two.)

A.A subquery can retrieve zero or more rows.

B.Only two subqueries can be placed at one level.

C.A subquery can be used only in SQL query statements.

D.A subquery can appear on either side of a comparison operator.

E.There is no limit on the number of subquery levels in the WHERE clause of a SELECT statement.

Answer: AD

 

98. Where can subqueries be used? (Choose all that apply.)

A.field names in the SELECT statement

B.the FROM clause in the SELECT statement

C.the HAVING clause in the SELECT statement

D.the GROUP BY clause in the SELECT statement

E.the WHERE clause in only the SELECT statement

F.the WHERE clause in SELECT as well as all DML statements

Answer: ABCF

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