Decode - not in

Question

Hi, I want to do the following logic using decode:
if code = 1 OR code = 2 or code=3 THEN
     ..and db_code=code
else
..and db_code!=1 and db_code!=2 and db_code!=3
END IF
I don't find similar examples searching here. The idea would be:
and db_code=decode(code,'-1',not in 1 not in 2 not in 3,code)
The problem is the 'else' code, if it was 'any code' it would be to pass -1 as code and:
and db_code=decode(code,'-1',db_code,code)
but isn't the case.
Thanks in advance

Answer 1

Hi,
I agree with Eric - it's hard to understand your exact requirements,. However, if you are trying to alter your Select query based on the value of Code, you might want to try Dynamic SQL.
Check out the Table & the Procedure :-
CREATE TABLE TEST_CODE
     CODE     VARCHAR2(10),
     DB_CODE     VARCHAR2(10)
INSERT INTO TEST_CODE VALUES (1,1);
INSERT INTO TEST_CODE VALUES (2,1);
INSERT INTO TEST_CODE VALUES (3,2);
INSERT INTO TEST_CODE VALUES (4,1);
COMMIT;
CREATE OR REPLACE PROCEDURE PR_GET_DECODES
     P_CODE VARCHAR2
AS
     V_SELECT_SQL     VARCHAR2(100);
     V_JOIN_SQL     VARCHAR2(100);
     V_SQL          VARCHAR2(100);
BEGIN
     FOR rec IN ( SELECT CODE FROM TEST_CODE )
     LOOP
          V_SQL:= ' SELECT CODE,DB_CODE FROM TEST_CODE WHERE ';
          IF rec.CODE = 1 OR rec.CODE = 2 OR rec.CODE =3
          THEN
               V_SQL:= V_SQL || ' DB_CODE = CODE ';
          ELSE
               V_SQL:= V_SQL || ' DB_CODE<>1 AND DB_CODE<>2 AND DB_CODE<>3 ';
          END IF;
          EXECUTE IMMEDIATE V_SQL;
     END LOOP;
END;
/It's just an example of what can be done - you can check out various other options with Dynamic SQL.
Regards,
Sandeep