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mysql中怎么判断某个字段是null还是not null

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Release: 2016-06-13 10:46:17
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mysql中如何判断某个字段是null还是not null
用php 在 mysql中如何判断某个字段是null还是not null


------解决方案--------------------
isnull
------解决方案--------------------
用IS, 不能用=或者==

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