无法将值NULL插入到CreationTime列中

Question

运行时异常：

  

无法将值NULL插入到'CreationTime'列表中   'MyTables';列不允许空值。插入   失败。

代码：

INSERT INTO [MyTables] (LegacyId, CreationTime)
    SELECT DISTINCT 
        a.[IPLID], a.[inputdate] 
    FROM 
        [Legacy].[dbo].[MyTables2] AS a 

在01/01/2000为a.[inputdate]时，您能告诉我如何插入自定义日期Null吗？

Answer 1

只需换入ISNULL：

INSERT INTO [MyTables] (LegacyId,CreationTime)
SELECT DISTINCT a.[IPLID],ISNULL(a.[inputdate], '01/01/2000')
FROM [Legacy].[dbo].[MyTables2] as a 

Answer 2

使用ISNULL功能。

INSERT INTO [MyTables] (LegacyId,CreationTime)
SELECT DISTINCT a.[IPLID],ISNULL(a.[inputdate], '01/01/2000') FROM [Legacy].[dbo].[MyTables2] as a