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当执行这个查询时,我期望得到2个移动数字和1个类别,而我得到2个类别,我做错了什么? 我想这与我加入事物的方式有关?带有2个连接的MySQL group_concat返回不需要的结果
用户,可以有多个IMEI的, categoryjoin用户链接到多个类别
SELECT
u.*,
group_concat(i.mobilenumber) as mobilenumbers,
group_concat(c.name) as categories
FROM
users AS u
INNER JOIN
categoryjoin AS cj
ON
u.uid = cj.user_id
INNER JOIN
categories AS c
ON
cj.category_id = c.uid
INNER JOIN
imei AS i
ON
u.uid = i.user_id
GROUP BY
u.uid
大预先感谢您的帮助!