MySQL：避免选择具有相同用户标识的列

Question

尝试选择所有列，但避免使用多于1个相同用户标识。

$result = mysql_query("select *, DISTINCT userid from ringtones where deletedbyuser='0' and (lang='$lang' or lang='en') order by id desc limit 10"); 

请大家帮忙。

表结构：

id int(10) 
userid int(10) 
artist varchar(100) 
title varchar(100) 
lang varchar(2) 
public int(1) 
status int(1) 
deletedbyuser int(1) 

Answer 1

可以

select r.* from ringtones r 
    inner join (select MIN(id) as id, userid from ringtones 
         where deletedbyuser='0' and (lang='$lang' or lang='en') 
         group by userid) s 
    on r.id = s.id 
order by r.id desc 
limit 10 

，这将挑选第一个被添加，如果有不止一个。