条件は、MySQL GROUP_CONCAT

Question

に私が要求

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

とMySQLのテーブルとそのような要求に票を持つテーブルがあります。

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

私が欲しいビューの種類：

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

私が使用したクエリ：

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

はこれまでのところ、しかし、私はこれを実現することができました

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; 

私の質問は、どうすれば2つのgroup_c同じ行の別の値でのoncats？

ありがとうございます！

Answer 1

これを試してみてください別のクエリ内のクエリを再使用してみました：

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 

結果：

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

Answer 2

は私が

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