OCP-1Z0-051-2015-49题

QUESTION NO: 49
Examine the structure of the EMPLOYEES and NEW_EMPLOYEES tables:



Which DELETE statement is valid?

A. DELETE FROM employeesWHERE employee_id = (SELECT employee_id FROM employees);

B. DELETE * FROM employeesWHERE employee_id=(SELECT employee_id FROM

new_employees);

C. DELETE FROM employeesWHERE employee_id IN (SELECT employee_id FROM

new_employees WHERE name = ‘Carrey’);

D. DELETE * FROM employeesWHERE employee_id IN (SELECT employee_id FROM

new_employees WHERE name = ‘Carrey’);

Answer: C
Explanation:

delete * from 语法错误 BD错误

子查询中必须为返回单条的记录，所以C正确。