单选题
You define a multiple-row subquery in the WHERE clause of an SQL query with a comparison operator "=". What happens when the main query is executed? （）
发布日期：2021-08-13
A
The main query executes with the first value returned by the subquery.
B
The main query executes with the last value returned by the subquery.
C
The main query executes with all the values returned by the subquery.
D
The main query fails because the multiple-row subquery cannot be used with the comparison operator.
E
You cannot define a multiple-row subquery in the WHERE clause of a SQL query.
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