sql - logic in HAVING clause to get multiple values of a group by result

Question

Imagine I have a table with data as below:

ROLE_ID | USER_ID  |  CODE
---------------------------------
 14     | USER A   |   001
 15     | USER A   |   002
 11     | USER B   |   004
 13     | USER D   |   005
 13     | USER A   |   001
 15     | USER B   |   009
 15     | USER D   |   005
 12     | USER C   |   004
 15     | USER C   |   008
 13     | USER D   |   007
 15     | USER D   |   007

I want to get the User ids and codes that only have 13 and 15 role_ids. So based on the data above I would like back the following

USER D |  005
USER D |  007

I have the query below, however, it only brings back one, not both.

   SELECT a.user_id, a.code
   FROM my_table a
   WHERE a.ROLE_ID in (13,15,11,14)
   group by a.USER_ID, a.code
    having sum( case when a.role_id in (13,15) then 1 else 0 end) = 2
    and sum( case when a.role_id in (11,14) then 1 else 0 end) = 0  
   ORDER BY USER_ID

The above query only brings

USER D |  005

rather than

USER D |  005
USER D |  007

Answer 1

Sometimes just listening to your own words in English translates into the easiest to read SQL:

SELECT DISTINCT a.user_id, a.code
   FROM my_table a
   WHERE a.user_id in 
       (SELECT b.user_id
       FROM my_table b
       WHERE b.ROLE_ID = 13)
    AND a.user_id in 
       (SELECT b.user_id
       FROM my_table b
       WHERE b.ROLE_ID = 15)
   AND a.user_id NOT IN 
       (SELECT b.user_id
       FROM my_table b
       WHERE b.ROLE_ID NOT IN (13,15))