How to get Simple Table data in multiple SQL query php

Question

i am trying to get data from one table, I received data from one table but there is some problem in my first table i have 6 query and i allow max 12 query in result. In my query i received repeat query in my SQL please have a look. sorry for bad English.

$query = $this->db->query("SELECT * FROM yt_sub,done WHERE yt_sub.current < yt_sub.total AND done.link != yt_sub.url AND done.uid != '$id' ORDER BY RAND() LIMIT 12");

Using this SQL query i received 12 rows but according to this sql only 6 rows pass throw it, but i received 6 rows.

Answer 1

使用DISTINCT参见下面的示例

$query = $this->db->query("SELECT DISTINCT * FROM yt_sub,done WHERE yt_sub.current < yt_sub.total AND done.link != yt_sub.url AND done.uid != '$id' ORDER BY RAND() LIMIT 12");

Answer 2

使用GROUP BY

$query = $this->db->query("SELECT * FROM yt_sub,done WHERE yt_sub.current < yt_sub.total AND done.link != yt_sub.url AND done.uid != '$id' GROUP BY done.uid ORDER BY RAND() LIMIT 12");