标签:071 原题 order 2019 table total ORDER orders DELETE
choose three
The ORDERS table has a primary key constraint on the ORDER_ID column.
The ORDER_ITEMS table has a foreign key constraint on the ORDER_ID column,referencing the primary key of the ORDERS table.
The constraint is defined with on DELETE CASCADE.
There are rows in the ORDERS table with an ORDER_TOTAL less than 1000.
Which three DELETE statements execute successfully?
A) DELETE FROM orders WHERE order_total<1000;
B) DELETE * FROM orders WHERE order_total<1000;
C) DELETE orders WHERE order_total<1000;
D) DELETE FROM orders;
E) DELETE order_id FROM orders WHERE order_total<1000;
Answer:ACD
(解析:这个考的是语法题,属于低智商题目,因为定义外键的时候用了 DELETE CASCADE 选项,所以父表的行是可以删除。)
标签:071,原题,order,2019,table,total,ORDER,orders,DELETE 来源: https://blog.51cto.com/13854012/2459181
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