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我已經建立了以下查詢: SQL查詢privatemsgs按錯誤
(SELECT privatemsgs.id, privatemsgs.useradn, privatemsgs.useraid, privatemsgs.title, privatemsgs.created, privatemsgs.timee, privatemsgs.isread, u.photo AS creatorphoto, privatemsgs.relatedto FROM privatemsgs LEFT JOIN users AS u ON(privatemsgs.useraid = u.id) WHERE userbid='5' AND relatedto=0 and bdel=1) UNION ALL (SELECT privatemsgs.id, privatemsgs.useradn, privatemsgs.useraid, privatemsgs.title, privatemsgs.created, privatemsgs.timee, privatemsgs.isread, u.photo AS creatorphoto, rel.relatedto FROM privatemsgs AS rel JOIN privatemsgs ON(rel.relatedto = privatemsgs.id) LEFT JOIN users AS u ON(rel.useraid = u.id) WHERE rel.userbid='5') GROUP BY id ORDER BY timee DESC
這個查詢從表中選擇所有Privatemsgs,並表現得像個郵件,爲前:
如果我發了msg給用戶b,用戶b回答我。我想在每個用戶的收件箱和發件箱中顯示msg。
對個人消息的評論標記爲「relatedto」主消息的ID。
查詢工作,但在顯示重複的MSG(同味精顯示很多次) 我爲了試圖做「GROUP BY ID」來修復它,但我得到了錯誤:
#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'GROUP BY id ORDER BY timee DESC'
THANK您!!
錯誤,味精,它說'GROUP BY願意與我們ORDER BY timee DESC' - 應該不是很'按時間降序排列'而不是? – michi 2013-03-17 02:01:21
'GROUP BY relatedto'甚至不在您顯示的查詢中。 – CBroe 2013-03-17 02:05:30
我不能放任何GROUP BY語句(不是ID和不相關)我編輯了這個問題 – GuyChabra 2013-03-17 02:06:43