多选题
Which two statements about subqueries are true? （）
发布日期：2021-11-23
A
A subquery should retrieve only one row.
B
A subquery can retrieve zero or more rows.
C
A subquery can be used only in SQL query statements.
D
Subqueries CANNOT be nested by more than two levels.
E
A subquery CANNOT be used in an SQL query statement that uses group functions.
F
When a subquery is used with an inequality comparison operator in the outer SQL statement, the column list in the SELECT clause of the subquery should contain only one column.
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