Question

Sql:

    CREATE TABLE OldTable
(
    TaskId INT PRIMARY KEY IDENTITY,
    TaskName VARCHAR(32)
)

CREATE TABLE NewTable
(
    TaskId INT PRIMARY KEY IDENTITY,
    TaskName VARCHAR(32)
)



INSERT INTO dbo.oldTable VALUES('TaskNo1')
INSERT INTO dbo.oldTable VALUES('TaskNo2')
INSERT INTO dbo.oldTable VALUES('TaskNo3')
INSERT INTO dbo.oldTable VALUES('TaskNo4')


DECLARE @MappingTableVar TABLE
(
    NewTaskid INT,
    OldTaksId int
);


INSERT INTO NewTable(TaskName) 
OUTPUT INSERTED.TaskId INTO @MappingTableVar(NewTaskId)
SELECT TaskName from OldTable 



SELECT * FROM @MappingTableVar

DROP TABLE NewTable;
DROP TABLE OldTable;

I would like to get mapping of OldTable’s TaskId vs NewTable’s TaksId.
I managed to get NewTaskId only.How can i get OldTask?

Need help on this.

Thanks

Answer 1

The simplest solution be:

Insert NewTable( TaskName )
Select TaskName
From OldTable

Insert @MappingTableVar( NewTaskId, OldTaskId )
Select NewTable.TaskId, OldTable.TaskId
From NewTable
    Join OldTable
        On OldTable.TaskName = NewTable.TaskName

There is no way to get the OldTable’s TaskId using the Output clause unless you include it in the insert (which means you need a column for it in NewTable):

Alter Table NewTable
    Add OldTaskId int 
GO

Insert NewTable( TaskName, OldTaskId )
Output inserted.TaskId, inserted.OldTaskId Into @MappingTableVar( NewTaskId, OldTaskId )
Select TaskName, TaskId
From OldTable