mysql - SQL 使用 group_concat 和每个串联项的计数而不是一行中的总计数

Question

MYSQl - Count of elements inside Group_Concat

我重写为 this fiddle ，但它给出了错误。

有人可以帮忙吗？

Answer 1

至于问题，要解决错误并获得正确的结果，您只需从聚合子查询中返回 CUSTOMERID(该列已经是 GROUP BY< 的一部分 子句)。

更新查询:

 SELECT SELLER, 
       COUNT(*) as COUNT_OF_CUSTIDS,
       GROUP_CONCAT(CUSTOMERID, ' (', cnt, ')' SEPARATOR '|') AS CUSTIDS
FROM (
    SELECT SELLER, CUSTOMERID, COUNT(*) as cnt
    FROM docs
    GROUP BY SELLER, CUSTOMERID
) t
GROUP BY SELLER
HAVING COUNT(*) > 1

返回:

| SELLER | COUNT_OF_CUSTIDS | CUSTIDS              |
| ------ | ---------------- | -------------------- |
| S1     | 3                | C2 (2)|C1 (2)|C3 (3) |
| S2     | 3                | C3 (1)|C2 (1)|C1 (2) |

Demo on DB Fiddle