mysql select显示相同的wp_agent_adds.id不是唯一的

Question

我需要一个显示每个wp_agent_adds.id唯一的查询。在下面的查询中，每个wp_agent_adds.id都有更多agent_target_countries的记录。例如，wp_agent_adds.id有3个agent_target_countries：BE，GB，NL。结果我获得3条记录而不是1条记录。

  

如何在此查询中对wp_agent_adds.id进行唯一过滤？

$query = "SELECT DISTINCT  t1.*, t2.*,
    t3.id as cid, t3.company_name, t3.city, t3.country          
    FROM wp_agent_adds AS t1
    INNER JOIN wp_agent_target_countries AS t2 ON t2.add_id = t1.id 
    INNER JOIN wp_agent_customer AS t3 ON t3.user_id = t1.user_id       
    WHERE t1.visible = 1    
    ORDER BY t1.date_added DESC
    ";

结果是： id = 100 - target = BE，id = 100 - target = GB，id = 100 - target = NL