Puede calcular directamente la diferencia en días (adaptado de mi respuesta aquí ):
SELECT start_date,
end_date,
ROUND(
(
-- Calculate the full weeks difference from the start of ISO weeks.
( TRUNC( end_date, 'IW' ) - TRUNC( start_date, 'IW' ) ) * (9/24) * (5/7)
-- Add the full days for the final week.
+ LEAST( TRUNC( end_date ) - TRUNC( end_date, 'IW' ), 5 ) * (9/24)
-- Subtract the full days from the days of the week before the start date.
- LEAST( TRUNC( start_date ) - TRUNC( start_date, 'IW' ), 5 ) * (9/24)
-- Add the hours of the final day
+ LEAST( GREATEST( end_date - TRUNC( end_date ) - 9/24, 0 ), 9/24 )
-- Subtract the hours of the day before the range starts.
- LEAST( GREATEST( start_date - TRUNC( start_date ) - 9/24, 0 ), 9/24 )
)
-- Multiply to give minutes rather than fractions of full days.
* 24 * 60
) AS work_day_mins_diff
FROM table_name;
Que, para los datos de muestra:
CREATE TABLE table_name ( start_date, end_date ) AS
SELECT DATE '2020-12-30' + INTERVAL '00' HOUR, DATE '2020-12-30' + INTERVAL '12' HOUR FROM DUAL UNION ALL
SELECT DATE '2020-12-30' + INTERVAL '18' HOUR, DATE '2020-12-30' + INTERVAL '20' HOUR FROM DUAL UNION ALL
SELECT DATE '2020-12-30' + INTERVAL '17:30' HOUR TO MINUTE, DATE '2020-12-30' + INTERVAL '21:30' HOUR TO MINUTE FROM DUAL UNION ALL
SELECT DATE '2021-01-01' + INTERVAL '00' HOUR, DATE '2021-01-04' + INTERVAL '00' HOUR FROM DUAL UNION ALL
SELECT DATE '2021-01-02' + INTERVAL '00' HOUR, DATE '2021-01-04' + INTERVAL '00' HOUR FROM DUAL UNION ALL
SELECT DATE '2020-12-28' + INTERVAL '00' HOUR, DATE '2021-01-04' + INTERVAL '00' HOUR FROM DUAL UNION ALL
SELECT DATE '2020-12-28' + INTERVAL '00' HOUR, DATE '2020-12-29' + INTERVAL '00' HOUR FROM DUAL;
Salidas:
(Utilizando ALTER SESSION SET NLS_DATE_FORMAT = 'YYYY-MM-DD HH24:MI:SS (DY)'; )
db<>fiddle aquí
