Configuración de Oracle :
CREATE TABLE Trip_Dates ( Start_Date, End_Date ) AS
SELECT TO_DATE( '2016-02-01 04:00:00', 'YYYY-MM-DD HH24:MI:SS' ), TO_DATE( '2016-02-02 10:00:00', 'YYYY-MM-DD HH24:MI:SS' ) FROM DUAL UNION ALL
SELECT TO_DATE( '2016-02-02 14:00:00', 'YYYY-MM-DD HH24:MI:SS' ), TO_DATE( '2016-02-06 20:00:00', 'YYYY-MM-DD HH24:MI:SS' ) FROM DUAL UNION ALL
SELECT TO_DATE( '2016-02-01 01:00:00', 'YYYY-MM-DD HH24:MI:SS' ), TO_DATE( '2016-02-02 07:00:00', 'YYYY-MM-DD HH24:MI:SS' ) FROM DUAL;
Consulta :
WITH Dates ( dt, start_end ) AS (
SELECT GREATEST( start_date, TRUNC( SYSDATE, 'MM' ) ),
1
FROM trip_dates
WHERE start_date < ADD_MONTHS( TRUNC( SYSDATE, 'MM' ), 1 )
AND end_date > TRUNC( SYSDATE, 'MM' )
UNION ALL
SELECT LEAST( end_date, ADD_MONTHS( TRUNC( SYSDATE, 'MM' ), 1 ) ),
-1
FROM trip_dates
WHERE start_date < ADD_MONTHS( TRUNC( SYSDATE, 'MM' ), 1 )
AND end_date > TRUNC( SYSDATE, 'MM' )
ORDER BY 1, 2
)
,range_start_ends ( dt, start_end, range_start, range_end ) AS (
SELECT d.*,
CASE
WHEN start_end = 1
AND SUM( start_end ) OVER ( ORDER BY dt ) = 1
THEN dt
ELSE NULL
END,
CASE
WHEN start_end = -1
AND SUM( start_end ) OVER ( ORDER BY dt ) = 0
THEN dt
ELSE NULL
END
FROM Dates d
),
worked_days ( worked_days ) AS (
SELECT range_end - LAG( range_start ) IGNORE NULLS OVER ( ORDER BY dt )
FROM range_start_ends
)
SELECT ( ADD_MONTHS( TRUNC( SYSDATE, 'MM' ), 1 )
- TRUNC( SYSDATE, 'MM' ) -
SUM( worked_days )
) * 24 AS unworked_hours
FROM worked_days;
Resultados :
UNWORKED_HOURS
--------------
561
