MySQL：避免選擇具有相同用戶標識的列

Question

嘗試選擇所有列，但避免使用多於1個相同用戶標識。

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

請大家幫忙。

表結構：

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 

，這將挑選第一個被添加，如果有不止一個。