Question

I have the following Database Structure

    Table1
============
T1ID
Fld1

    Table2
============
T2ID
T1ID(Foreign Key from Table1)
Fld1

    Table3
============
T3ID
T2ID(Foreign Key from Table2)
Fld1

Now first I will filter Table2 and Table3 data based on T1ID.

After that I am required to duplicate these filtered record in the same tables. I want to accomplish this using stored procedure. I have seen examples in which data is duplicated in one table but I don’t have idea how to achieve this in these two master detail tables.

Answer 1

declare @T1ID int = 1

declare @T table(OldT2ID int, NewT2ID int)

merge Table2 as T
using (select T2ID, Fld1
       from Table2
       where T1ID = @T1ID) as S
on (0 = 1)
when not matched then
  insert (T1ID, Fld1) values (@T1ID, S.Fld1)
output S.T2ID, inserted.T2ID into @T;

insert into Table3(T2ID, Fld1)
select T.NewT2ID, T3.Fld1
from Table3 as T3
  inner join @T as T
    on T3.T2ID = T.OldT2ID