增加mysql和GROUP_CONCAT中的计数器

Question

这是我的mysql查询：

SELECT users.id, user.name, category.id,
       GROUP_CONCAT(category.name) AS catName,
       @rownum := @rownum + 1 AS row_number
FROM users
JOIN usecat ON id_users=users.id
JOIN category ON id_category=category.id
CROSS JOIN (select @rownum := 0) r
GROUP BY users.id

结果：AAA-1，BBB-3，CCC-8，......

我想得到这样的结果：AAA-1，BBB-2，CCC-3，......

你能帮我改变一下这个问题吗？感谢。

Answer 1

试试这个：

SET @rownum=1;
SELECT *, @rownum := @rownum + 1 AS row_number 
FROM (SELECT users.id, user.name, category.id,
       GROUP_CONCAT(category.name) AS catName
  FROM users
  JOIN usecat ON id_users=users.id
  JOIN category ON id_category=category.id
GROUP BY users.id) t;