是否可以在一个查询中使用这2个mySQL查询？

Question

我有两个没有任何问题的mySQL查询。第一个提取引用者，第二个计算国家％和数字。但是，我需要在第一个查询中包含国家％和数字，换句话说，我怎样才能将它们一起使用？

SELECT *, COUNT(*) FROM track 
where referid='".$member."' 
GROUP BY referer 
ORDER BY id desc limit 0,15 


select id, country, num, num*100/total pct 
from (SELECT id,country, count(*) as num 
FROM track GROUP BY country 
ORDER BY num desc limit 3) x 
join (select count(*) total from track) y 

Answer 1

加入与内嵌视图：

SELECT *, COUNT(*) FROM track t 
where t.referid='".$member."' 
GROUP BY t.referer 
ORDER BY t.id desc limit 0,15 
JOIN 
(
    select id, country, num, num*100/total pct 
    from (SELECT id,country, count(*) as num 
    FROM track GROUP BY country 
    ORDER BY num desc limit 3) x 
    join (select count(*) total from track) y 
) tc on t.id = tc.id 

见接受的答案，以this question获取更多信息。你将不得不调整你的选择清单，以免发生冲突。