php-如何在查询中组合RAND和DESC

我有一个查询：

$msg_check = MysqL_query ("SELECT * FROM msgs WHERE name='$name' ORDER BY replies DESC LIMIT 5");
while($row = MysqL_fetch_array($msg_check)) {
$comment = $row['comment'];
$nickname = $row['nickname'];

我需要做的是对大多数答复做出5条评论,并对其进行随机排序.
我尝试过将RAND与DESC结合使用,但是失败了：/

解决方法:

您可以在ORDER BY子句中应用使用RAND()的外部查询：

SELECT *
FROM (
  SELECT * 
  FROM msgs 
  WHERE name='$name' 
  ORDER BY replies DESC LIMIT 5) AS t
ORDER BY RAND()

注意：始终最好在SELECT子句中显式命名每个字段,而不要使用*.