php - MYSQL: SELECT * FROM `user_log` WHERE `id` is sequential and `username` == EQUAL in multiple rows -


i've searched high , long answer this. have database collects data whenever user logs onto our network. users complaining of disconnections, crawl database, , find sections user appearing in database on 3 sequential rows.

database structure is:

id          user  1           mike 2           john 3           mike 4           mike 5           mike 6           john 7           john 8           mike

i query return below (mike user logged on 3 sequential id's)

id          user  3           mike 4           mike 5           mike

i'm stumped how attack this.

i'm thinking like:

select * `user_log` `id` sequential??? , `username` == ???

possibly sub-select ?

what need establish grouping identifier each consecutive sequence of users, , use temporary table perform query groups on new grouping identifier. that, grab group has 3 or more rows, , can use min/max values of id show range. need use variables accomplish this.

 select min(id), max(id), user   (     select if(@prev != user, if(@prev := user, @rc := @rc +1, @rc := @rc + 1), @rc) g,            id, user       log, (select @prev := -1, @rc := 0) q       order id desc   ) q   group g   having count(g) >= 3;

demo here

this part: (select @prev := -1, @rc := 0) q initialises variables can in single statement.


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