mysql选择用户信息和组类别

Question

我正在尝试进行mysql搜索，该搜索返回带有分组类别（group_id）的用户信息。我只是需要一些帮助才能正确查询我的信息：

SELECT a.*, a.name AS editor, a.name AS created_by, b.*, c.* FROM `cm0x8_users` AS a LEFT JOIN cm0x8_users_xref AS b ON b.userid = a.id LEFT JOIN cm0x8_user_usergroup_map AS c ON c.user_id = a.id WHERE (a.block IN (0, 1)) AND c.group_id NOT IN(6,7,8) ORDER BY a.name asc

返回同一个用户3次（他们分为3个不同的组）。

示例：

id          name          group_id
1           Fred          1
1           Fred          2
1           Fred          3
2           John          1
3           Jane          1
3           Jane          3

但我在追求：

id          name          group_id
1           Fred          1, 2, 3
2           John          1
3           Jane          1, 3

（或类似）

任何帮助都会很棒！

Answer 1

这似乎给了我预期的结果..

SELECT a.*,a.name AS editor,a.name AS created_by,b.*,group_concat(c.group_id) as gid,c.* FROM `#__users` AS a LEFT JOIN #__users_xref AS b ON b.userid = a.id LEFT JOIN #__user_usergroup_map AS c ON c.user_id = a.id WHERE (a.block IN (0, 1)) AND c.group_id NOT IN(6,7,8) GROUP BY a.id ORDER BY a.name asc