摘要: 判断表明(select Count(*) from admin)>=0 exists(select Count(*) from admin) 判断列明exists(select user from admins) and exists(select username from admin)>=0 猜 阅读全文
posted @ 2018-04-22 22:32 戴帽子的小孩 阅读(246) 评论(0) 推荐(0) 编辑