Question

I have to run multiple queries that are dependent on each other

select a from a ( result has multiple rows)
select b from b  ( result has multiple rows)

the for each row in that query i need to run this

select c from c where c.a=a amd c.b=b

 insert  c into d 

kinda like:

select a from a ( result has multiple rows)
select b from b  ( result has multiple rows 
  for a in a
      for b in b
          select c from c where c.a=a amd c.b=b
          insert  c,a,b into d 

is this possible to do as an stored procedure?

thank you

Answer 1

Stored procedure? Sure. Shoot, it’s even possible in one statement:

INSERT INTO d (c)
  SELECT c FROM c WHERE c.a IN (SELECT a FROM a) AND c.b IN (SELECT b FROM b)

You can probably even do a little better with a join, but to write that I need to know more about how the tables relate.