Help with building nested cursors

Question

Hello all,
In one of our plsql procedures, we return a cursor of cursors that looks like this:
OPEN main_cursor FOR
  SELECT
    CURSOR (
      SELECT query1
    ) c1,
    CURSOR (
      SELECT query2
    ) c2
  FROM DUAL;Now, we need to add a new condition that changes query1 into either query1a or query1b (depending of the condition). An easy refactor was done to the code as follows:
IF (some_condition) THEN
  OPEN main_cursor FOR
    SELECT
      CURSOR (
        SELECT query1a
      ) c1,
      CURSOR (
        SELECT query2
      ) c2
    FROM DUAL;
ELSE
  OPEN main_cursor FOR
    SELECT
      CURSOR (
        SELECT query1b
      ) c1,
      CURSOR (
        SELECT query2
      ) c2
    FROM DUAL;However, as you can see, query2 is duplicated in the if and else clauses. I wasn't able to find a way to avoid this duplication. Any ideas someone?
Also, note that the difference between query1a and query1b is a table join.
Thanks in advance,
wf

Answer 1

OPEN FOR allows for dynamic SQL where statements are put together by concatenating strings.
http://www.morganslibrary.org/reference/ref_cursors.html
Look at the demo of a Weakly Typed REF CURSOR.