Question

我需要按时间获得结果顺序，但是因为我使用sql查询到其他sql查询的一段时间我得到rtoken = token[0:1]

排序的结果

$arrID

结果是：

$req1==mysql_query("SELECT friendId FROM friends ");
while($res1=mysql_fetch_row($req1)) {
    $arrID = $res['friendId'];

    $req = mysql_query("SELECT * FROM posts WHERE postby=$arrID  ORDER BY posttime DESC ");
    while ($res = mysql_fetch_row($req)) {
        echo $res['bostby'];
        echo $res['postcontent'];
    }
}

并且我需要按时间顺序而不是id

post 1 by 2 content aaaaaaaa  time: 11:60
post 2 by 2 content bbbbbbbb   time 11:59
post 3 by 2 content aaaaaaaa  time: 11:58
post 4 by 2 content bbbbbbbb   time 11:56
post 5 by 3 content aaaaaaaa  time: 11:61
post 6 by 3 content bbbbbbbb   time 11:60
post 7 by 3 content aaaaaaaa  time: 11:59
post 8 by 5 content bbbbbbbb   time 12:20
post 8 by 5 content bbbbbbbb   time 12:19

Answer 1

使用连接两个表的单个查询，而不是执行嵌套循环。

SELECT p.* FROM posts AS p
JOIN friends AS f ON p.postby = f.friendId
ORDER BY p.posttime DESC

从您的评论中看来，您的第一个查询并非如此简单。但是你可以加入一个子查询。

SELECT p.* FROM posts AS p
JOIN (
    SELECT user_from AS friendId
    FROM friend_requests 
    WHERE user_to = $SessionID AND accepted = '1'
    UNION
    SELECT user_to AS friendId
    FROM friend_requests
    WHERE user_from = $SessionID AND accepted = '1'
) AS f ON p.postby = f.friendId
ORDER BY p.posttime DESC

在第二个查询中根据时间从两个查询中排序结果

1 个答案: