Nested FOR cursor and now results

Question

Hi Guys,
I have a simple nexted FOR cursor but the second cursor does not retrieve
anything at all. The first cursor retrieves values from a-z in low caps letters.
If I replace in cursor 2 the clause
SUBSTR(key#,1,1) = SUBSTR(key_rec1.key#,1,1);
with
SUBSTR(key#,1,1) = 'a'
It works fine, if I leave it without my manuall fix it does not retrieve
any rows. Anyone an idea? I use Oracle 11g.
DECLARE
CURSOR c1 IS
SELECT DISTINCT(SUBSTR(key#,1,1)) AS key# FROM mytable;
key_rec1 c1%rowtype;
CURSOR c2 IS
SELECT key#,
FROM mytable
WHERE
*SUBSTR(key#,1,1) = SUBSTR(key_rec1.key#,1,1); --key_rec1.key#;*
key_rec2 c2%rowtype;
BEGIN
FOR key_rec1 in c1
LOOP
FOR key_rec2 in c2
LOOP
INSERT INTO mytable2
key#
*          SELECT key#*
*          FROM mybookingtab bsch*
*          where bsch.key# = key_rec2.key#*
END LOOP; -- c2
*END LOOP; --c1*
END;
*/*

Answer 1

One should think you'd have learned how to use tags withing 400+ posts...
not tested:{code}declare
CURSOR c1 IS
SELECT DISTINCT (SUBSTR (key#
                       ,  1
                       ,  1
                  AS key#
  FROM mytable;
-- key_rec1 c1%ROWTYPE; -- needing this should have triggered some thinking...
CURSOR c2 (p_key_rec1 c1%ROWTYPE)IS -- declare a parameter
SELECT key#,
FROM mytable WHERE SUBSTR(key#,1,1) = SUBSTR(p_key_rec1.key#,1,1);  --key_rec1.key#;
--key_rec2 c2%ROWTYPE;
BEGIN
  FOR key_rec1 IN c1 LOOP
    FOR key_rec2 IN c2(key_rec1) LOOP -- pass the outer loops current row
      INSERT INTO mytable2 (key#)* (*
* SELECT key#*
* FROM mybookingtab bsch*
* where bsch.key# = key_rec2.key#*
END LOOP; -- c2
END LOOP; --c1
END;
/{code}
bye
TPD