OCP-12cCUUG 071题库考试原题及答案解析（17）

Posted 2021-02-09

17、（7-11） choose two
View the Exhibit and examine the structure of ORDER_ITEMS and ORDERS tables.
You need to remove from the ORDER_ITEMS table those rows that have an order status of 0 or 1 in
the ORDERS table.
Which two DELETE statements are valid? (Choose two.)

A) DELETE
FROM order_items
WHERE order_id IN (SELECT order_id
FROM orders
WHERE order_status in (0,1));

B) DELETE *
FROM order_items
WHERE order_id IN (SELECT order_id
FROM orders
WHERE order_status IN (0,1));

C) DELETE
FROM (SELECT * FROM order_items i,orders o
WHERE i.order_id = o.order id AND order_status IN (0,1));

D) DELETE FROM order_items i
WHERE order_id = (SELECT order_id FROM orders o
WHERE i.order_id = o.order_id AND order_status IN (0,1));
Answer：AC
（解析：B 和 C 语法不对，可以实验，都会报错）