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MySQL怎么查询可以同时判断多个字段值是否存在
2022-07-28 07:07:00 【CSDN问答】
比如注册查询 是否有手机号、邮箱、用户名、昵称重复，
SELECT COUNT(nickname) FROM user where nickname='果汁'
不能这样查4次吧，有办法一次性查出4个值是否存在吗，并且区分哪个存在哪个不存在
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