조건은 MySQL의 GROUP_CONCAT

Question

내가 요청

+--------+-------------+-----+ 
| req_id | req_name | ... | 
+--------+-------------+-----+ 
| 1  | testrequest | ... | 
+--------+-------------+-----+ 

와 MySQL의 테이블과 같은 요청에 대한 투표가있는 테이블이있다.

+--------+-----------+----------+ 
| req_id | vote_name | approved | 
+--------+-----------+----------+ 
| 1  | User1  | 1  | 
| 1  | User2  | 1  | 
| 1  | User3  | 1  | 
| 1  | User4  | 0  | 
| 1  | User5  | 0  | 
+--------+-----------+----------+ 

보기의 종류는 내가 원하는 :

+--------+-------------+----------+---------------------+ 
| req_id | req_name | approved | by     | 
+--------+-------------+----------+---------------------+ 
| 1  | testrequest | YES  | User1, User2, User3 | 
| 1  | testrequest | NO  | User4, User5  | 
+--------+-------------+----------+---------------------+ 

내가 사용하는 쿼리 :

+--------+-------------+---------------------+--------------+ 
| req_id | req_name | approved_by   | rejected_by | 
+--------+-------------+---------------------+--------------+ 
| 1  | testrequest | User1, User2, User3 | User4, User5 | 
+--------+-------------+---------------------+--------------+ 

그러나 지금까지 난 단지 이러한 목표를 달성 할 수있었습니다

SELECT requests.req_id, req_name, CASE 
     WHEN approved THEN 'YES' 
     ELSE 'NO' 
     END AS approved, GROUP_CONCAT(vote_name ORDER BY vote_name ASC SEPARATOR ', ') AS by 
FROM requests 
LEFT JOIN votes ON requests.req_id = votes.req_id 
GROUP BY requests.req_id, approved 
ORDER BY requests.req_id DESC; 

제 질문은, 어떻게해야합니까 2 group_c 다른 값을 가진 같은 행의 온 캣?

고마워요!

Answer 1

이 시도 다른 쿼리 안에 쿼리를 다시 사용하여 시도 :

select r.req_id, r.req_name, 
    group_concat(if(approved, vote_name, null) separator ', ') approvedBy, 
    group_concat(if(approved, null, vote_name) separator ', ') rejectedBy 
from requests r 
left join votes v on r.req_id = v.req_id 

결과 :

+--------+-------------+---------------------+--------------+ 
| REQ_ID | REQ_NAME |  APPROVEDBY  | REJECTEDBY | 
+--------+-------------+---------------------+--------------+ 
|  1 | testrequest | User1, User2, User3 | User4, User5 | 
+--------+-------------+---------------------+--------------+ 

Answer 2

나는

SELECT req_id, 
    req_name, 
    GROUP_CONCAT(case approved when 'YES' then voted_by else null end SEPARATOR ', ') AS approved_by, 
    GROUP_CONCAT(case approved when 'NO' then voted_by else null end SEPARATOR ', ') AS rejected_by 
FROM 
(
SELECT requests.req_id, req_name, CASE 
    WHEN approved THEN 'YES' 
    ELSE 'NO' 
    END AS approved, 
    GROUP_CONCAT(vote_name ORDER BY vote_name ASC SEPARATOR ', ') AS voted_by 
FROM requests 
LEFT JOIN votes ON requests.req_id = votes.req_id 
GROUP BY requests.req_id, approved 
ORDER BY requests.req_id DESC 
) t 
group by req_id