mysql - 带有连接或子查询的 MySQL 查询

Question

我有这样的架构和查询： http ://sqlfiddle.com/#!2/7b032/3

另外我有这些查询：

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;

通过比较两个表的用户 ID 列，我需要加入它们。
我需要具有以下列的输出：
“ times, userid, name, age, location”
还应考虑顺序、组和限制。

如果您可以编写一个带有 JOIN 的查询和一个带有子查询的查询，我会很高兴。
我有一张 60k 的桌子，我会比较性能。

Answer 1

这个怎么样：

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

见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

请参阅带有演示的 SQL Fiddle