如何使用「GROUP_CONCAT」只過濾行從表中的MySQL

Question

已列IsDisabled我想用group_concat只排在那裏IsDisabled=0

目前我使用

select parentid,group_concat(REPLACE(WhatDoYouSell, ',', '')) sales from table_name 
group by parentid 

我想使用GROUP_CONCAT到WhatDoYouSell列如果只有該行的IsDisabled=0

我有

嘗試10

select parentid,group_concat(REPLACE(WhatDoYouSell, ',', '')) sales from table_name 
where IsDisabled=0 
group by parentid 

似乎是查詢忽略所有的group by parentid records如果IsDisabled =1

Answer 1

試試這個rec​​oeds之一：

SELECT parentid,GROUP_CONCAT(REPLACE(WhatDoYouSell, ',', '')) sales 
FROM (SELECT parentid, WhatDoYouSell FROM table_name 
WHERE IsDisabled=0) AS A 
GROUP BY parentid 

Answer 2

嘗試此查詢與內部條件 -

CREATE TABLE table_name(
    parentid INT(11) DEFAULT NULL, 
    WhatDoYouSell INT(11) DEFAULT NULL, 
    IsDisabled INT(11) DEFAULT NULL 
); 
INSERT INTO table_name(parentid, WhatDoYouSell, IsDisabled) VALUES 
(1, 1, 0), 
(1, 2, 1), 
(1, 3, 0), 
(2, 1, 1), 
(2, 2, 1); 

SELECT 
    parentid, 
    GROUP_CONCAT(IF(IsDisabled = 0, WhatDoYouSell, NULL)) sales 
FROM 
    table_name 
GROUP BY 
    parentid; 

+----------+-------+ 
| parentid | sales | 
+----------+-------+ 
|  1 | 1,3 | 
|  2 | NULL | 
+----------+-------+