查询mysql数据库表中字段为null的记录:
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select * from 表名 where 字段名 is null
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示例:
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select * from student where address is null
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查询mysql数据库表中字段不为null的记录:
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select * from 表名 where 字段名 is not null
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示例:
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1
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select * from student where address is not null
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未经允许不得转载:主机阁 » MySQL判断字段是否为Null
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