sql server - get the employee 'in/out' status based on 'enter/exit' column -


in sql server, how can employee 'in/out' status based on 'enter/exit' column? example, if last record employee 'enter', 'in'. if last record 'exit', 'out'. id=111, in_out should 'in', , id=222 should 'out'

+-----+---------------------+------------+ | id  |      timestamp      |   status   | +-----+---------------------+------------+ | 111 | 01/01/2017 07:00:10 | enter      | | 222 | 01/01/2017 01:10:29 | enter      | | 111 | 01/01/2017 18:20:17 | exit       | | 111 | 01/02/2017 08:20:34 | enter      | | 333 | 01/02/2017 06:20:11 | enter      | | 222 | 01/02/2017 10:10:47 | exit       | +-----+---------------------+------------+

i understand should use case statement, following code won't work 

select id, case           when status = 'enter' 'in'          when status = 'exit' 'out'          else 'n/a'          end in_out   table1

if understand correctly can query below:

select id, case when [status] = 'enter' 'in' else 'out' end in_out     (     select *, rown = row_number() over(partition id order [timestamp] desc) #timedata ) a.rown = 1

output below:

+-----+--------+ | id  | in_out | +-----+--------+ | 111 | in     | | 222 | out    | | 333 | in     | +-----+--------+

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