Question

I am quite new to SQL and while I can get around writing most of the queries, I am not getting anywhere with this one. I want to achieve this in a single query that I can execute using JPA.

TABLE RULE:
RULE_ID   ENABLED
-----------------
1         0
2         0
3         0
4         1
5         1

TABLE MISC:
MISC_ID
--------
1
2

TABLE HOLD:
HOLD_ID   MISC_ID   RULE_ID   READY
------------------------------------
1         1         1         1       
2         1         2         1       
3         1         3         1       
4         2         4         0      
5         2         1         1       

I want to select from HOLD only the MISC_IDs where each row has READY=1 and RULE_ID is in (RULE_IDs where ENABLED=0). In the above example, the query should return MISC_ID = {1} since HOLD_IDs 1, 2 and 3 all have READY=1 and RULEs 1, 2 and 3 are all disabled.

MISC_ID 2 should not be returned since HOLD_ID 4 has READY=0.

The tables MISC and HOLD have millions of rows but RULE is fairly small (<1000 rows).

Any suggestions on how I could write a native SQL to achieve this? PL/SQL is not an option.

Answer 1

SELECT MISC_ID
FROM HOLD

GROUP BY MISC_ID
HAVING MIN(READY) <> 0;

---

Example run:

$ with HOLD (HOLD_ID, MISC_ID, RULE_ID, READY)
as (values
    (1,1,1,1),
    (2,1,2,1),
    (3,1,3,1),
    (4,2,4,0),
    (5,2,1,1)
)

select MISC_ID
from HOLD

group by MISC_ID
having min(READY) <> 0;

 misc_id
---------
       1
(1 row)

---

Amended query to handle joining rules:

SELECT HOLD.*, RULE.*

FROM HOLD

INNER JOIN RULE
ON HOLD.RULE_ID = RULE.RULE_ID AND RULE.ENABLED = 0

WHERE MISC_ID IN (
    SELECT MISC_ID
    FROM HOLD

    GROUP BY MISC_ID
    HAVING MIN(READY) <> 0
);