SELECT x.*, TIMEDIFF(x.logout_date, x.login_date) as duration FROM ( SELECT a.user_id, a.`date` as logout_date, (SELECT MAX(b.`date`) FROM table1 b WHERE b.`date` <a.`date` and b.user=a.user and b.type = 'login') as login_date FROM table1 a WHERE a.type ='logout' )x