我正在尝试编写一个脚本来将数据从Table1插入到Table2,只有当Employee在Table1中而不在Table2中或者Employee Information从Table1更改为Table2时才添加更改。
样本数据:
表格1:
EmployeeNumber - Name - HireDate - TermDate
-------------------------------------------
1234 - Ted - 8-12-1980 - NULL
9632 - Josh - 1-1-2019 - 3-29-2019
5678 - Jeff - 3-29-2019 - NULL
表2:
EmployeeNumber - Name - HireDate - TermDate - ChangeDate
---------------------------------------------------------
1234 - Ted - 8-12-1980 -NULL - 8-12-1980
9632 - Josh - 1-1-2019 - NULL - 1-1-2019
我已经尝试了几个插入和更新查询没有运气。
此查询用于插入不存在的记录。
INSERT INTO Table2 ([EmployeeNumber], [Name], [HireDate], [Termdate], [ChangeDate])
SELECT
*, GETDATE() AS 'ChangeDate'
FROM
Table1
WHERE
NOT EXISTS (SELECT [EmployeeNumber]
FROM Table2
WHERE Table1.[EmployeeNumber] = Table2.[EmployeeNumber])
查询运行后,Table2应如下所示:
表2:
EmployeeNumber - Name - HireDate - TermDate - ChangeDate
---------------------------------------------------------
1234 - Ted - 8-12-1980 - NULL - 8-12-1980
9632 - Josh - 1-1-2019 - NULL - 1-1-2019
9632 - Josh - 1-1-2019 - 3-26-2019 - 3-29-2019
5678 - Jeff - 3-29-2019 - NULL - 3-29-2019
我不确定你在问什么,但我认为你正在寻找的方法是INNER JOIN
祝好运!