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mssql查找备注(text,ntext)类型字段为空的方法

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2016-06-07 17:57:341583browse

在sql语句中，如果查找某个文本字段值为空的，可以用select * from 表 where 字段='' ，但是如果这个字段数据类型是text或者ntext，那上面的sql语句就要出错了。

解决办法有很多：

1 . select * from 表 where datalength(字段)=0

2. select * from 表 where cast(字段 as varchar(100))=''

3. select * from 表 where 字段 like ''

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