sql server - sql query for logins for days -


my question table:

userid       logintime            logouttime 1           1/8/17 10am           1/8/17  9pm 2          1/8/17 9am           1/8/17  10pm 3          1/8/17 11am          1/8/17  6pm 1          2/8/17 11am          2/8/17  7pm 2          2/8/17 6am           2/8/17  4pm 3          2/8/17 8am           2/8/17  3pm 1          3/8/17 4am          3/8/17  1pm 2          3/8/17 11am         3/8/17  11pm 3          3/8/17 5am          3/8/17  5pm

i need sql query time gap between user 1st day second day

example answer table:

userid      logintime          logouttime            timegap 1          1/8/17 10am          1/8/17  9pm          25 hours 1          2/8/17 11am          2/8/17  7pm

time gap userid=1 1/8/17 10am 2/8/17 11am 25 hours

below use common table expression (cte) on existing table increments userid , ordered logintime earliest last, join joining on row number +1 

with cte as( select  userid, logintime, logouttime, row_number() on (partition userid order logintime asc nulls last) rn table ) select  cte.userid, cte.logintime, cte.logouttime,  (cte.logintime-cte2.logintime) timegap cte left join on cte cte2 on (cte.rn +1)=cte2.rn , cte.userid=cte2.userid

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