mysql - SQL: Calculate time spent one each page -

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i have 2 tables:

pages:  id  |       page |           date    |           visit_id ----     ----------      ---------             ------------ 1         1           2015-05-07 13:53:50           1  2         2           2015-05-07 13:53:54           1 3         3           2015-05-07 13:54:10           1 4         4           2015-05-07 13:54:49           1 5         1           2015-05-07 14:54:15           2  6         3           2015-05-07 14:54:30           2 7         4           2015-05-07 14:54:37           2  visits:   id  |    end_date                ----     ---------                  1       2015-05-07 13:54:55  2       2015-05-07 14:54:50

i want average time spend on each page, after running query, final result should this:

page    count(seconds)  1           9.5   2            16     3            23  4            9.5

the last page user visited it's calculated using end_date in visits table.

any ideas how query like?

edit: calculation example:

page 1 avg seeconds = (2015-05-07 13:53:54 - 2015-05-07 13:53:50 + 2015-05-07 14:54:30 - 2015-05-07 14:54:15) /2  last page avg = (2015-05-07 13:54:55 - 2015-05-07 13:54:49 + 2015-05-07 14:54:50 - 2015-05-07 14:54:37) / 2

considering following data set:

drop table if exists pages;  create table pages (id  int not null auto_increment primary key ,page int not null ,date datetime not null ,visit_id int not null );  insert pages values (1,1,'2015-05-07 13:53:50',1),  (2,2,'2015-05-07 13:53:54',1),  (3,3,'2015-05-07 13:54:10',1),  (4,4,'2015-05-07 13:54:49',1),  (5,1,'2015-05-07 14:54:15',2),  (6,3,'2015-05-07 14:54:30',2),  (7,4,'2015-05-07 14:54:37',2);  drop table if exists visits;  create table visits (id int not null  ,end_date datetime not null );  insert visits values (1,'2015-05-07 13:54:55'), (2,'2015-05-07 14:54:50');

an intermediate result might this:

select p.*      , time_to_sec(timediff(coalesce(min(x.date),v.end_date),p.date)) n    pages p    left    join pages x      on x.visit_id = p.visit_id     , x.date > p.date    join visits v      on v.id = p.visit_id   group      p.id; +----+------+---------------------+----------+------+ | id | page | date                | visit_id | n    | +----+------+---------------------+----------+------+ |  1 |    1 | 2015-05-07 13:53:50 |        1 |    4 | |  2 |    2 | 2015-05-07 13:53:54 |        1 |   16 | |  3 |    3 | 2015-05-07 13:54:10 |        1 |   39 | |  4 |    4 | 2015-05-07 13:54:49 |        1 |    6 | |  5 |    1 | 2015-05-07 14:54:15 |        2 |   15 | |  6 |    3 | 2015-05-07 14:54:30 |        2 |    7 | |  7 |    4 | 2015-05-07 14:54:37 |        2 |   13 | +----+------+---------------------+----------+------+

...and complete query might therefore this...

select page,avg(n)         ( select p.*             , time_to_sec(timediff(coalesce(min(x.date),v.end_date),p.date)) n           pages p           left           join pages x             on x.visit_id = p.visit_id            , x.date > p.date           join visits v             on v.id = p.visit_id          group             p.id      )  group     page; +------+---------+ | page | avg(n)  | +------+---------+ |    1 |  9.5000 | |    2 | 16.0000 | |    3 | 23.0000 | |    4 |  9.5000 | +------+---------+

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