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MySQL 的 IFNULL 查询

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Release： 2016-06-07 14:54:59
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如果 f1 为空 就是用 f2 ，这就是 IFNULL MySQL SELECT * FROM 用户表 ORDER BY IFNULL(nickname, realname);SELECT IFNULL(NULL,10); -- 10

如果 f1 为空 就是用 f2 ，这就是 IFNULL
MySQL 
SELECT * FROM 用户表 ORDER BY IFNULL(nickname, realname);

SELECT IFNULL(NULL,10); -- > 10
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ifnull mysql Is empty Inquire
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