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分类: Oracle

2019-02-19 09:23:51

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)
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