Question

I have such a schema and queries:
http://sqlfiddle.com/#!2/7b032/3

Seperately I have these queries:

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;

By comparing userid columns of both table I need to join them.
I need an output having these columns:
“times, userid, name, age, location“
Also order, group and limits should be considered.

I would be happy if you can write one query with JOIN and one query with subquery.
I have a 60k table and I will compare the performances.

Answer 1

How about this:

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

see SQL Fiddle with Demo

edit:

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

see SQL Fiddle with demo