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sqlserver中时间为空的处理小结 - 站长搜索
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sqlserver中时间为空的处理小结

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2022-09-23 20:42:06 转载来源: 网络整理/侵权必删

现将几种主要情况进行小结:一、如何输入NULL值如果不输入null值,当时间为空时,会默认写入"1900-01-01",在业务处理时很麻烦。ctrl+0即可输入NULL值

现将几种主要情况进行小结
一、如何输入NULL值
如果不输入null值,当时间为空时,会默认写入"1900-01-01",在业务处理时很麻烦。
ctrl+0即可输入NULL值。
二、如何在sql语句中判断为NULL的时间字段
假设表为:TestTable
SN    DateTime1    DateTime2
1    2011-10-24   2011-10-25
2    NULL       2011-10-26
3    2011-10-25   NULL
用case进行查询,若写成:
select (case DateTime1 when NULL then 'a' else 'b' end) from TestTable
则查询结果为:

b

这显然不是想要的结果;需要写成:
select (case DateTime1 when DateTime1 then 'b' else 'a' end) from TestTable
其查询结果才为:

a

这才是想要的结果。

标签: sqlserver 时间 空的 处理 小结


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