单选题：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。

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)>1;

D.
SELECT gid FROM order WHERE HAVING COUNT(gid)>1 GROUP BY gid;



答案：C