MySQL查询加入或子查询

Question

我有这样一个架构和查询： http://sqlfiddle.com/#!2/7b032/3

Seperately我有这些疑问：

SELECT COUNT(*) AS 'times', userid, name 
FROM main 
WHERE comedate <= DATE_SUB(CURDATE(), 
        INTERVAL 5 DAY) 
GROUP BY userid ORDER BY times DESC LIMIT 0,2; 

SELECT * FROM details WHERE 1; 

通过比较两个表中的用户ID列，我需要加入他们的行列。
我需要一个输出具有这些列：
“times, userid, name, age, location”
也应考虑顺序，组和限制。

如果您可以使用JOIN和带有子查询的查询编写一个查询，我会很高兴。
我有一张60k桌子，我会比较表演。

Answer 1

如何：

select x.times, 
    x.userid, 
    x.name, 
    d.age, 
    d.location 
from 
(
    SELECT COUNT(*) AS 'times', userid, name 
    FROM main 
    WHERE comedate <= DATE_SUB(CURDATE(), 
        INTERVAL 5 DAY) 
    GROUP BY userid 
) x 
left join details d 
    on x.userid = d.userid 

看到SQL Fiddle with Demo

编辑：

select x.times, 
    x.userid, 
    x.name, 
    d.age, 
    d.location 
from 
(
    SELECT COUNT(*) AS 'times', userid, name 
    FROM main 
    WHERE comedate <= DATE_SUB(CURDATE(), 
        INTERVAL 5 DAY) 
    GROUP BY userid 
    ORDER BY times DESC 
    LIMIT 0,2 
) x 
left join details d 
    on x.userid = d.userid 

看到SQL Fiddle with demo