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我试图在分组之前对表（评论）进行排序，所以我创建了一个名为的临时表comm_sorted并按时间戳对其进行排序。

但是，它仍然不起作用。

    $sql = "
select images.id,images.image as imageURL, images.fid as userID, user.name as userFullName, images.comment as feedDescription, images.sharedServices, stores.name as customerName, 
CONCAT('[', 
GROUP_CONCAT(
DISTINCT CONCAT('\"',likes.uid,'\"')),']') as likes , 
CONCAT('[', 
GROUP_CONCAT(
DISTINCT CONCAT('{\"userId\":\"',comm_sorted.uid,'\",\"comment\":\"',comm_sorted.comment,'\",\"timeStamp\":\"',comm_sorted.timestamp,'\"}') separator ','),']')  as comments FROM images 
LEFT JOIN stores on images.client_id=stores.id 
LEFT JOIN likes on images.id=likes.feedid 
LEFT JOIN (select * from comments order by timestamp DESC) as comm_sorted on images.id=comm_sorted.feedid  
LEFT JOIN user on images.fid=user.id WHERE images.fid=:userID group by images.id, user.name, images.image, images.comment, images.sharedServices, stores.name order by images.Timestamp 
DESC LIMIT $offset, $limit";
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1 回答 1

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感谢 Barmar 先生 - 您可以在 GROUP_CONCAT() 函数中添加 ORDER BY comm_sorted.timestamp 选项。无需临时查询。问题关闭。

于 2012-09-28T16:00:13.100 回答