我试图从相同的表数据更新相同的表数据.
我的SP如下所示:
UPDATE T1
SET T1.Name = T2.Name
, T1.Age = T2.Age
, T1.Subject = T2.Subject
FROM Student T1
, Student T2
WHERE T1.StudentID = @OldID
AND T2.StudentID = @NewID
当我执行此查询时,没有错误.但更新无效.
[这里没有要比较的公共列值,如T1.StudentID = T2.StudentID]