使用group by将multiquery转换为查询，依此类推

Question

-schema

CREATE TABLE `ratings` (
  `id` int(11) NOT NULL default '0',
  `rating` int(11) NOT NULL default '1',
  `rating_start` datetime NOT NULL default '0000-00-00 00:00:00',
  PRIMARY KEY  (`id`)
) TYPE=MyISAM

-myprogram.php

foreach($ids as $id){
  $sql =  "SELECT rating FROM ratings WHERE id = '$id' AND rating_start >= NOW()"; 
  $sql .= "ORDER BY rating_start DESC LIMIT 1;"
  $ret = $db->execute($id);
}

我可以从查询中查找相同的日期吗？

现在我在foreach中有很多疑问

Answer 1

呀。我会做substr(implode(",",$ids),0,-1)。否则你会在你的ID结尾留下一个逗号。