Question

我有日期时间字段，当空白日期值添加后自动设置为Jan 1 1900 12:00AM或1\1\1900我该如何避免这些。以下是我用于更新[MOUNT DATE]字段

的代码

[MOUNT DATE] = 
CASE WHEN T1.[ROUTING]='L&P' then ''
END
ELSE T1.[A-MOUNT BY]
END

FROM WO T1
     INNER JOIN inserted i ON T1.[WO#] = i.[WO#]
    END

Answer 1

而不是''使用NULL

[MOUNT DATE] = 
CASE WHEN T1.[ROUTING]='L&P' then NULL
END
ELSE T1.[A-MOUNT BY]
END

FROM WO T1
     INNER JOIN inserted i ON T1.[WO#] = i.[WO#]
    END

通过此示例程序进行测试

create table #temp1
(
mydate date null

)


insert #temp1 values (getdate())
select * from #temp1
update #temp1  set mydate = NULL
select * from #temp1

drop table  #temp1

datetime设置为1 \ 1 \ 1900而不是Null或Blank

1 个答案: