Which two statements are true regarding subqueries? （）A、A subquery can retrieve zero or more rows B、Only two subqueries can be placed atone level C、A subquery can be used only in SQL query statements D、A subquery can appear on either side of a comparison

题目

Which two statements are true regarding subqueries? （）

A、A subquery can retrieve zero or more rows
B、Only two subqueries can be placed atone 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

参考答案和解析

正确答案:A,D

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