Data filtering base on condition

Question

hi all, i need some help filtering the data below
WITH data1 AS
SELECT 1 pid, 'BS' typecd, 'SECC' category FROM dual UNION ALL
SELECT 1 pid, 'BS' typecd, 'SECCA' category FROM dual UNION ALL
SELECT 2 pid, 'PET' typecd, 'SECC' category FROM dual UNION ALL
SELECT 2 pid, 'BS' typecd, 'PRINC' category FROM dual UNION ALL
SELECT 3 pid, 'CAT' typecd, 'PRINC' category FROM dual UNION ALL
SELECT 3 pid, 'CAT' typecd, 'AC' category FROM dual UNION ALL
SELECT 3 pid, 'PET' typecd, 'AC' category FROM dual UNION ALL
SELECT 4 pid, 'PET2' typecd, 'SECC' category FROM dual UNION ALL
SELECT 4 pid, 'PET2' typecd, 'SECCA' category FROM dual
)what i want to do is get all rows where typecd <> PET and (typecd <> BS only when category is secc and secca)
so output should be as follow
pid      typecd    category
=====    =====     =========
2        BS        PRINC
3        CAT       PRINC
3        CAT       AC
4        PET2      SECC
4        PET2      SECCAas you can see for pid =1, the typecd is bs and category is secc and secca. so i elimate this row sinde i dont
want any rows where typecd <> bs only when category is secc and secca.
pid = 2 has typecd = pet and bs so i dont want to display the row that contain pet regardless of what category is.
however, there is a row with bs but the category is not secc or secca. so i want to display this one
pid=3 i want to diplay the two rows with typecd=cat because they either are not <> pet or <bs and belong to secc and secca.
pid=4 has pet2 and category is secc and secca but i want to display it since the typecd is not <> bs
in summary i want to get all rows with typecd <> PET regarless of category and also i want to display those rows
where (typecd <> bs only when category is secc and secca)
can someone help write a query that produce the output above? thanks you.

Answer 1

Try this,
SQL> WITH DATA1
  2       AS (SELECT 1 PID, 'BS' TYPECD, 'SECC' CATEGORY FROM DUAL
  3           UNION ALL
  4           SELECT 1 PID, 'BS' TYPECD, 'SECCA' CATEGORY FROM DUAL
  5           UNION ALL
  6           SELECT 2 PID, 'PET' TYPECD, 'SECC' CATEGORY FROM DUAL
  7           UNION ALL
  8           SELECT 2 PID, 'BS' TYPECD, 'PRINC' CATEGORY FROM DUAL
  9           UNION ALL
10           SELECT 3 PID, 'CAT' TYPECD, 'PRINC' CATEGORY FROM DUAL
11           UNION ALL
12           SELECT 3 PID, 'CAT' TYPECD, 'AC' CATEGORY FROM DUAL
13           UNION ALL
14           SELECT 3 PID, 'PET' TYPECD, 'AC' CATEGORY FROM DUAL
15           UNION ALL
16           SELECT 4 PID, 'PET2' TYPECD, 'SECC' CATEGORY FROM DUAL
17           UNION ALL
18           SELECT 4 PID, 'PET2' TYPECD, 'SECCA' CATEGORY FROM DUAL)
19  SELECT *
20    FROM DATA1
21   WHERE CASE
22            WHEN (TYPECD = 'BS'
23                  AND CATEGORY IN ('SECC', 'SECCA'))
24                 OR TYPECD = 'PET'
25            THEN 0 ELSE 1 END = 1;
       PID TYPE CATEG
         2 BS   PRINC
         3 CAT  PRINC
         3 CAT  AC
         4 PET2 SECC
         4 PET2 SECCA
SQL> G.