Mr Green went home ______ Christmas, the children had a good time ______ Christmas Eve.
A.
on, on
B.
at, on
C.
in, in
D.
at, at
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参考答案:
举一反三
【简答题】有订单表order,包含用户信息uid, 商品信息gid, 以下( )语句能够返回至少被购买两次的商品id。A.SELECT gid FROM order WHERE COUNT(gid)>1; B.SELECT gid FROM order WHERE MAX(gid)>1; C.SELECT gid FROM order GROUP BY gid HAVING COUNT(gid...