Question

I am new stored procedures and trying to write a procedure to duplicate user(by user_id) master detail data into a new user data. Here is my table structure. I will pass a target user_id and destination user_id to the stored procedure. Could you please let me know the how to achieve this functionality? I appreciate any help.

TABLE A
----------------
a_id       int(Primary Key)  
desc       varchar(50)
user_id    int

TABLE B
-----------------
b_id       int(Primary Key)
a_id       int(Foreign Key)
detail     varchar(100)

CREATE PROCEDURE [duplicate_user_data] 
    @old_user_id int,
    @new_user_id int
AS
BEGIN
    INSERT INTO TABLEA
           ([desc]
           ,[user_id]
           )
    select desc, user_id from TABLEA where user_id = @old_user_id
END

Answer 1

You can use a self-join to match the old and new parent ids.

CREATE PROCEDURE [duplicate_user_data] 
    @old_user_id int,
    @new_user_id int
AS
    INSERT INTO TableA ([desc], [user_id])
    SELECT [desc], @new_user_id
    FROM TableA
    WHERE [user_id] = @old_user_id

    INSERT INTO TableB ([a_id], [detail])
    SELECT NewTableA.[a_id], TableB.[detail]
    FROM TableA AS NewTableA
    CROSS JOIN TableA AS OldTableA
    JOIN TableB ON TableB.[a_id] = OldTableA.[a_id]
    WHERE NewTableA.[user_id] = @new_user_id
    AND OldTableA.[user_id] = @old_user_id