Time difference of hours and minutes [closed] - oracle

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I am trying to find out the time difference in hours and minutes but getting error, Please help to find out the query , For example I need answer of below in oracle
16:55- 14:00 = 2:55

Answer 1

Convert the times to a DATE or TIMESTAMP and then subtract one from the other to get an INTERVAL DAY TO SECOND data type; then use EXTRACT to get the hour and minute components and format them:
SELECT start_time,
end_time,
TO_CHAR( EXTRACT( HOUR FROM difference ), 'FM00' )
|| ':'
|| TO_CHAR( ABS( EXTRACT( MINUTE FROM DIFFERENCE ) ), 'FM00' )
AS difference
FROM (
SELECT start_time,
end_time,
( TO_DATE( end_time, 'HH24:MI' ) - TO_DATE( start_time, 'HH24:MI' ) ) DAY TO SECOND
AS difference
FROM test_data
)
Which, for the test data:
CREATE TABLE test_data ( start_time, end_time ) AS
SELECT '14:00', '16:55' FROM DUAL UNION ALL
SELECT '14:50', '15:23' FROM DUAL UNION ALL
SELECT '16:00', '14:00' FROM DUAL UNION ALL
SELECT '16:00', '14:20' FROM DUAL UNION ALL
SELECT '00:00', '23:59' FROM DUAL;
Outputs:
START_TIME | END_TIME | DIFFERENCE
:--------- | :------- | :---------
14:00 | 16:55 | 02:55
14:50 | 15:23 | 00:33
16:00 | 14:00 | -02:00
16:00 | 14:20 | -01:40
00:00 | 23:59 | 23:59
db<>fiddle here

Answer 2

Please see below
SELECT
substr(
to_char(TO_TIMESTAMP ('16:55', 'HH24:MI') -
TO_TIMESTAMP ('14:00', 'HH24:MI'),
'HH24:MI')
,12
,5) "Hours"
FROM
DUAL;
SELECT
to_number(substr(
to_char(TO_TIMESTAMP ('16:55', 'HH24:MI') -
TO_TIMESTAMP ('14:00', 'HH24:MI'),
'HH24:MI')
,12
,2))
+
to_number(substr(
to_char(TO_TIMESTAMP ('16:55', 'HH24:MI') -
TO_TIMESTAMP ('14:00', 'HH24:MI'),
'HH24:MI')
,15
,2))/60 "Decimal Hours"
FROM
DUAL;
Output
Hours
-----
02:55
Decimal Hours
-------------
2.91666667

Answer 3

Assuming that your two times are strings, you can use a query like the one below to calculate the difference between the times. By casting time strings to dates, you can then subtract them from each other and convert the result into the format that you want.
Query
WITH
times (start_time, end_time)
AS
(SELECT '14:00', '16:55' FROM DUAL
UNION ALL
SELECT '5:00', '3:00' FROM DUAL
UNION ALL
SELECT '7:00', '23:45' FROM DUAL
UNION ALL
SELECT '15:00', '03:20' FROM DUAL)
SELECT start_time,
end_time,
TRUNC (
( TO_DATE ('1-JAN-2000 ' || end_time, 'DD-MON-YYYY HH24:MI')
- TO_DATE ('1-JAN-2000 ' || start_time, 'DD-MON-YYYY HH24:MI'))
* 24)
|| ':'
|| RPAD (
ABS (
TRUNC (
( ( ( TO_DATE ('1-JAN-2000 ' || end_time, 'DD-MON-YYYY HH24:MI')
- TO_DATE ('1-JAN-2000 ' || start_time, 'DD-MON-YYYY HH24:MI'))
* 24)
- TRUNC (
( TO_DATE ('1-JAN-2000 ' || end_time, 'DD-MON-YYYY HH24:MI')
- TO_DATE ('1-JAN-2000 ' || start_time, 'DD-MON-YYYY HH24:MI'))
* 24))
* 60)),
2,
'0') AS difference
FROM times;
Result
START_TIME END_TIME DIFFERENCE
_____________ ___________ _____________
14:00 16:55 2:55
5:00 3:00 -2:00
7:00 23:45 16:45
15:00 03:20 -11:40