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當執行這個查詢時,我期望得到2個移動數字和1個類別,而我得到2個類別,我做錯了什麼? 我想這與我加入事物的方式有關?帶有2個連接的MySQL group_concat返回不需要的結果
用戶,可以有多個IMEI的, categoryjoin用戶鏈接到多個類別
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
大預先感謝您的幫助!