如何解决？消息515，级别16，状态2，第2行无法将值NULL插入列，列不允许为空。 INSERT失败

Question

我正在使用SQL Server。

我正在尝试使用另一个（stagingdata）中列的数据加载新表（uploadfile）。登台表的列不允许空值。

我已经尝试过此代码：

INSERT INTO [x].[stagingdata](DepartmentCode, CourseHours, CourseCredits, CourseDescription)
    SELECT
        SUBSTRING([Course (hr, crd)], 1, CHARINDEX(' ', [Course (hr, crd)])) AS DeptCode,
        (SUBSTRING([Course (hr, crd)], CHARINDEX('(',[Course (hr, crd)]) + 1, 
         LEN(CHARINDEX(',', [Course (hr, crd)]) - CHARINDEX('(', [Course (hr, crd)]) - 1))) AS CourseHours,
        (SUBSTRING([Course (hr, crd)], CHARINDEX(',',[Course (hr, crd)]) + 1, 
         LEN(CHARINDEX(',', [Course (hr, crd)]) - CHARINDEX(')', [Course (hr, crd)]) - 1))) AS CourseCredits,
        [Description]
    FROM
        [x].[Uploadfile]

如何在不出现此错误的情况下将数据加载到列中？

我尝试过：

insert into..
    select..
    from...
    where columnname is not null

但不起作用。

有什么建议吗？谢谢！

此外，我也在MAC OS上使用Azure DataStudio。

Answer 1

select 
ISNULL(substring([Course (hr, crd)], 1, charindex(' ', [Course (hr, crd)])),'') as DeptCode,
ISNULL(SUBSTRING([Course (hr, crd)], CHARINDEX('(',[Course (hr, crd)]) + 1, len(CHARINDEX(',', [Course (hr, crd)]) - CHARINDEX('(', [Course (hr, crd)]) - 1))),'')  AS CourseHours,
ISNULL(SUBSTRING([Course (hr, crd)], CHARINDEX(',',[Course (hr, crd)]) + 1, len(CHARINDEX(',', [Course (hr, crd)]) - CHARINDEX(')', [Course (hr, crd)]) - 1))),'')  AS CourseCredits,
ISNULL([Description],'')