Choose two.ide
Which two statements are true about the results of using the INTERSECT operator in compound queres?排序
A) Reversing the order of the intersected tables can sometimes affect the output.table
B) Column names in each SELECT in the compound query can be dfferent.數據類型
C) INTERSECT returns rows common to both sides of the compound query.im
D) The number of columns in each SELECT in the compound query can be dfferent.數據
E) INTERSECT ignores NULLs查詢
Answer::BCtab
(解析:intersect 會以第一個查詢的第一個列的值進行排序輸出,因爲求的是交集,因此表的查詢順序能夠不分前後;列的名字能夠不同,可是數據類型必須匹配。)query