nested cursor loops

Posted on 2004-08-31
Last Modified: 2012-05-05
I have a problem in that i need to create a nested loop in PL/SQL. I basically need to use information from the first loop which uses a cursor to select information in the second loop, which also uses a cursor. As it stands i can not get it working. Any help would be appreciated, especially examples.

Question by:wizard2000
LVL 34

Accepted Solution

johnsone earned 250 total points
ID: 11942255
You need to use a paramterized cursor, like this:

   cursor outer is
     select col1
        from tab1;
   cursor inner(v_col1 tab1.col1%type)
     select col2
        from tab2
       where col3 = v_col1;


   for outer_rec in outer loop
     for inner_rec in inner(outer_rec.col1) loop
     end loop;
  end loop;

Expert Comment

ID: 11942282
Here's a very simple example of using an inner and outer cursor for loop:

FOR rec1 IN (SELECT table_name FROM user_tables) LOOP
      FOR rec2 IN (SELECT column_name FROM user_tab_columns WHERE table_name = rec1.table_name AND column_id = 1) LOOP
      END LOOP;

If you have any particular problems, perhaps we could help you with them?

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