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数据库查询某个字段是否为空，不能用字段=null来判断，而应该用is null来判断 #8

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数据库查询某个字段是否为空，不能用字段=null来判断，而应该用is null来判断#8
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@zhanzengyu
zhanzengyu
opened on Dec 19, 2019
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