Sql 复制同一表的多行，但id不同，并将复制行的旧id存储在列名old ids中

这是我使用游标的代码，它做得很好，但由于速度问题，我不想使用游标

DECLARE @StudentID NVARCHAR(MAX)='1,2,4,5,6,7,8,9,10'    

SELECT value StudentID INTO #TMP_tbSchedulTas FROM STRING_SPLIT(@StudentID,',')

DECLARE @SchedID AS Integer
SELECT @SchedID = StudentID
FROM #TMP_tbSchedulTas

DECLARE Attendence CURSOR FOR

SELECT StudentID FROM #TMP_tbSchedulTas

OPEN Attendence
FETCH NEXT FROM Attendence INTO @SchedID

WHILE @@FETCH_STATUS = 0
BEGIN

INSERT INTO dbo.Student
(
FirstName,LastName,
FatherName,DOB,CNIC,Religon,Mobile,Email,Address,Gender,Isactive,Isdeleted,CreatedBy,CreatedOn,CityID,OldstudentId,BranchID,IsSelected,StudentGUID )
SELECT FirstName,LastName,
FatherName,DOB,CNIC,Religon,Mobile,Email,Address,Gender,Isactive,Isdeleted,CreatedBy,CreatedOn,CityID,@SchedID,BranchID,IsSelected,StudentGUID FROM dbo.Student
WHERE StudentID=@SchedID

FETCH NEXT FROM Attendence INTO @SchedID
END

CLOSE Attendence
DEALLOCATE Attendence

-- drop temporary table to store schedule event attendees email status
DROP TABLE #TMP_tbSchedulTas

---

您可以这样简化它，但是我不确定您是否真的想从同一个表中读取数据并再次插入到该表中，原因是什么

DECLARE @StudentID NVARCHAR(MAX) = N'1,2,4,5,6,7,8,9,10';

INSERT INTO dbo.Student
    (
        FirstName
        , LastName
        , FatherName
        , DOB
        , CNIC
        , Religon
        , Mobile
        , Email
        , Address
        , Gender
        , Isactive
        , Isdeleted
        , CreatedBy
        , CreatedOn
        , CityID
        , OldstudentId
        , BranchID
        , IsSelected
        , StudentGUID
    )
SELECT
    FirstName
    , LastName
    , FatherName
    , DOB
    , CNIC
    , Religon
    , Mobile
    , Email
    , Address
    , Gender
    , Isactive
    , Isdeleted
    , CreatedBy
    , CreatedOn
    , CityID
    , @SchedID
    , BranchID
    , IsSelected
    , StudentGUID
FROM
    dbo.Student
WHERE
    StudentID IN
        (
            SELECT
                value StudentID
            FROM
                STRING_SPLIT(@StudentID, ',')
        );

---

使用和a，如中所示，而不是使用@SchedID，我可以直接使用studentID