MYSQL LEFT JOIN with GROUP BY

Question

:) I have 2 queries, and I need to join them, I need to compare the working time of employee depending on activity with total working time of company in the same activity in def

Answer 1

The simplest would be using sub-queries (though they're in general not too efficient, but those GROUP BY's may make other solutions difficult).

Something like this should do it:

SELECT a.*, b.tottime AS 'Total time (company)'
FROM
    (SELECT u.login, a.article, p.p_article, (SUM(p.p_going) + SUM(p.p_leaving) + SUM(p.p_working)) AS 'Total time (worker)'
    FROM pos p, users u, articles a
    WHERE u.login = p.p_login
    AND REPLACE( u.login, '.', '_' ) = 'users_name'
    AND p.p_datum >= '2013-04-09'
    AND p.p_datum <= '2013-04-16'
    AND p.p_article = a.id
    GROUP BY a.article) a
LEFT JOIN
    (SELECT a.article, p.p_article, (SUM(p.p_going) + SUM(p.p_leaving) + SUM(p.p_working)) AS tottime
    FROM pos p, articles a
    WHERE p.p_datum >= '2013-04-09'
    AND p.p_datum <= '2013-04-16'
    AND p.p_article = a.id
    GROUP BY a.article) b
ON a.article = b.article /* AND a.p_article = b.p_article ?? */

Answer 2

You can just join the 2 queries together as a pair of subselects.

Something like:-

SELECT Sub1.a, Sub1.b, Sub2.c
FROM (SELECT a, b FROM z) Sub1
INNER JOIN (SELECT a, c FROM y) Sub2
ON Sub1.a = Sub2.a

However can't really give you more as you first example query doesn't seem to bring back the details you say (only brings back 3 columns).

EDIT - With the corrected queries

SELECT Sub1.login AS User_name, Sub1.article AS Activity, Sub1.p_article AS `Activity id`, Sub1.tottime AS `Totaltime(worker)`, Sub2.tottime AS `Totaltime(company)`
FROM (SELECT u.login,a.article, p.p_article, (SUM(p.p_going) + SUM(p.p_leaving) + SUM(p.p_working)) AS tottime
FROM pos p
INNER JOIN users u ON u.login = p.p_login 
INNER JOIN articles a ON p.p_article = a.id
WHERE REPLACE( u.login, '.', '_' ) = 'users_name'
AND p.p_datum >= '2013-04-09'
AND p.p_datum <= '2013-04-16'
GROUP BY a.article) Sub1
INNER JOIN 
(SELECT a.article, p.p_article, (SUM(p.p_going) + SUM(p.p_leaving) + SUM(p.p_working)) AS tottime
FROM pos p
INNER JOIN articles a ON p.p_article = a.id
WHERE p.p_datum >= '2013-04-09'
AND p.p_datum <= '2013-04-16'
GROUP BY a.article) Sub2
ON Sub1.p_article = Sub2.p_article