Finding difference in time

Question

Hi I want to find the difference in the time both are date fileds
login logout
1/24/2010 8:36:45 AM 1/24/2010 10:18:01 AM
1/25/2010 3:29:28 PM 1/25/2010 3:30:49 PM
rgds
ramya

Answer 1

You can use CASE and CAST, subtract the timestamps and only show the time component using SUBSTR
(I added column EARLY_IN, in case of workaholics ;) ) :
SQL> create table t as (
  2  select to_date('1/23/2010 7:45:45 AM', 'mm/dd/yyyy hh:mi:ss: AM') login, to_date('1/23/2010 06:05:30 PM', 'mm/dd/yyyy hh:mi:ss: AM') logout from dual union all
  3  select to_date('1/24/2010 8:36:45 AM', 'mm/dd/yyyy hh:mi:ss: AM'), to_date('1/24/2010 04:18:01 PM', 'mm/dd/yyyy hh:mi:ss: AM') from dual union all
  4  select to_date('1/26/2010 8:00:45 AM', 'mm/dd/yyyy hh:mi:ss: AM'), to_date('1/26/2010 01:20:43 PM', 'mm/dd/yyyy hh:mi:ss: AM') from dual union all
  5  select to_date('1/25/2010 8:10:28 AM', 'mm/dd/yyyy hh:mi:ss: AM'), to_date('1/25/2010 5:30:49 PM', 'mm/dd/yyyy hh:mi:ss: AM') from dual
  6  );
Table created.
SQL> select login
  2  ,      logout
  3  ,      case
  4            when to_date(to_char(login, 'hh24:mi:ss'), 'hh24:mi:ss') < to_date('08:00:00', 'hh24:mi:ss')
  5            then
  6              substr(( cast( to_date('08:00:00', 'hh24:mi:ss') as timestamp)+ to_char(login, 'dd')
  7                       -
  8                       cast(login as timestamp)
  9                     )
10                     , 12, 8
11                    )
12         end early_in
13  ,      case
14            when to_date(to_char(login, 'hh24:mi:ss'), 'hh24:mi:ss') > to_date('08:00:00', 'hh24:mi:ss')
15            then
16              substr(( cast(login as timestamp)
17                       -
18                       cast( to_date('08:00:00', 'hh24:mi:ss') as timestamp)
19                     )
20                     , 12, 8
21                    )
22         end late_in
23  ,      case
24            when to_date(to_char(logout, 'hh24:mi:ss'), 'hh24:mi:ss') < to_date('17:00:00', 'hh24:mi:ss')
25            then
26               substr((
27                        --
28                        cast( to_date('17:00:00', 'hh24:mi:ss') as timestamp)+ to_char(logout, 'dd')
29                        -
30                        cast(logout as timestamp)
31                      )
32                      , 12, 8
33                     )
34         end early_out
35  ,      case
36            when to_date(to_char(logout, 'hh24:mi:ss'), 'hh24:mi:ss') > to_date('17:00:00', 'hh24:mi:ss')
37            then
38               substr(( cast(logout as timestamp)
39                        -
40                        cast( to_date('17:00:00', 'hh24:mi:ss') as timestamp)
41                      )
42                      , 12, 8
43                     )
44         end late_out
45  from   t --<< change this table name into your own table name
46  /
LOGIN               LOGOUT              EARLY_IN LATE_IN  EARLY_OUT  LATE_OUT
23-01-2010 07:45:45 23-01-2010 18:05:30 00:14:15                     01:05:30
24-01-2010 08:36:45 24-01-2010 16:18:01          00:36:45 00:41:59
26-01-2010 08:00:45 26-01-2010 13:20:43          00:00:45 03:39:17
25-01-2010 08:10:28 25-01-2010 17:30:49          00:10:28            00:30:49Edited by: hoek on Jan 28, 2010 2:28 PM typo, a 'wokaholic' is someone who likes to cook I guess ;)