Эта следующая функция примет вход для
рабочее время начала дня
рабочее время окончания дня
время начала
Время окончания
-- helper function
CREATE OR REPLACE FUNCTION get_working_time_in_a_day(sdt TIMESTAMP, edt TIMESTAMP, swt TIME, ewt TIME) RETURNS INT AS
$$
DECLARE
sd TIMESTAMP; ed TIMESTAMP; swdt TIMESTAMP; ewdt TIMESTAMP; seconds INT;
BEGIN
swdt = sdt::DATE || ' ' || swt; -- work start datetime for a day
ewdt = sdt::DATE || ' ' || ewt; -- work end datetime for a day
IF (sdt < swdt AND edt <= swdt) -- case 1 and 2
THEN
seconds = 0;
END IF;
IF (sdt < swdt AND edt > swdt AND edt <= ewdt) -- case 3 and 4
THEN
seconds = EXTRACT(EPOCH FROM (edt - swdt));
END IF;
IF (sdt < swdt AND edt > swdt AND edt > ewdt) -- case 5
THEN
seconds = EXTRACT(EPOCH FROM (ewdt - swdt));
END IF;
IF (sdt = swdt AND edt > swdt AND edt <= ewdt) -- case 6 and 7
THEN
seconds = EXTRACT(EPOCH FROM (edt - sdt));
END IF;
IF (sdt = swdt AND edt > ewdt) -- case 8
THEN
seconds = EXTRACT(EPOCH FROM (ewdt - sdt));
END IF;
IF (sdt > swdt AND edt <= ewdt) -- case 9 and 10
THEN
seconds = EXTRACT(EPOCH FROM (edt - sdt));
END IF;
IF (sdt > swdt AND sdt < ewdt AND edt > ewdt) -- case 11
THEN
seconds = EXTRACT(EPOCH FROM (ewdt - sdt));
END IF;
IF (sdt >= ewdt AND edt > ewdt) -- case 12 and 13
THEN
seconds = 0;
END IF;
RETURN seconds;
END;
$$
LANGUAGE plpgsql;
-- Get work time difference
CREATE OR REPLACE FUNCTION get_working_time(sdt TIMESTAMP, edt TIMESTAMP, swt TIME, ewt TIME) RETURNS INT AS
$$
DECLARE
seconds INT = 0;
strst VARCHAR(9) = ' 00:00:00';
stret VARCHAR(9) = ' 23:59:59';
tend TIMESTAMP; tempEdt TIMESTAMP;
x int;
BEGIN
<<test>>
WHILE sdt <= edt LOOP
tend = sdt::DATE || stret; -- get the false end datetime for start time
IF edt >= tend
THEN
tempEdt = tend;
ELSE
tempEdt = edt;
END IF;
-- skip saturday and sunday
x = EXTRACT(DOW FROM sdt);
if (x > 0 AND x < 6)
THEN
seconds = seconds + get_working_time_in_a_day(sdt, tempEdt, swt, ewt);
ELSE
-- RAISE NOTICE 'MISSED A DAY';
END IF;
sdt = (sdt + (INTERVAL '1 DAY'))::DATE || strst;
END LOOP test;
--RAISE NOTICE 'diff in minutes = %', (seconds / 60);
RETURN seconds;
END;
$$
LANGUAGE plpgsql;
-- Table Definition
DROP TABLE IF EXISTS test_working_time;
CREATE TABLE test_working_time(
pk SERIAL PRIMARY KEY,
start_datetime TIMESTAMP,
end_datetime TIMESTAMP,
start_work_time TIME,
end_work_time TIME
);
-- Test data insertion
INSERT INTO test_working_time VALUES
(1, '2015-11-03 01:00:00', '2015-11-03 07:00:00', '08:00:00', '22:00:00'),
(2, '2015-11-03 01:00:00', '2015-11-04 07:00:00', '08:00:00', '22:00:00'),
(3, '2015-11-03 01:00:00', '2015-11-05 07:00:00', '08:00:00', '22:00:00'),
(4, '2015-11-03 01:00:00', '2015-11-06 07:00:00', '08:00:00', '22:00:00'),
(5, '2015-11-03 01:00:00', '2015-11-07 07:00:00', '08:00:00', '22:00:00'),
(6, '2015-11-03 01:00:00', '2015-11-03 08:00:00', '08:00:00', '22:00:00'),
(7, '2015-11-03 01:00:00', '2015-11-04 08:00:00', '08:00:00', '22:00:00'),
(8, '2015-11-03 01:00:00', '2015-11-05 08:00:00', '08:00:00', '22:00:00'),
(9, '2015-11-03 01:00:00', '2015-11-06 08:00:00', '08:00:00', '22:00:00'),
(10, '2015-11-03 01:00:00', '2015-11-07 08:00:00', '08:00:00', '22:00:00'),
(11, '2015-11-03 01:00:00', '2015-11-03 11:00:00', '08:00:00', '22:00:00'),
(12, '2015-11-03 01:00:00', '2015-11-04 11:00:00', '08:00:00', '22:00:00'),
(13, '2015-11-03 01:00:00', '2015-11-05 11:00:00', '08:00:00', '22:00:00'),
(14, '2015-11-03 01:00:00', '2015-11-06 11:00:00', '08:00:00', '22:00:00'),
(15, '2015-11-03 01:00:00', '2015-11-07 11:00:00', '08:00:00', '22:00:00'),
(16, '2015-11-03 01:00:00', '2015-11-03 22:00:00', '08:00:00', '22:00:00'),
(17, '2015-11-03 01:00:00', '2015-11-04 22:00:00', '08:00:00', '22:00:00'),
(18, '2015-11-03 01:00:00', '2015-11-05 22:00:00', '08:00:00', '22:00:00'),
(19, '2015-11-03 01:00:00', '2015-11-06 22:00:00', '08:00:00', '22:00:00'),
(20, '2015-11-03 01:00:00', '2015-11-07 22:00:00', '08:00:00', '22:00:00'),
(21, '2015-11-03 01:00:00', '2015-11-03 23:00:00', '08:00:00', '22:00:00'),
(22, '2015-11-03 01:00:00', '2015-11-04 23:00:00', '08:00:00', '22:00:00'),
(23, '2015-11-03 01:00:00', '2015-11-05 23:00:00', '08:00:00', '22:00:00'),
(24, '2015-11-03 01:00:00', '2015-11-06 23:00:00', '08:00:00', '22:00:00'),
(25, '2015-11-03 01:00:00', '2015-11-07 23:00:00', '08:00:00', '22:00:00'),
(26, '2015-11-03 08:00:00', '2015-11-03 11:00:00', '08:00:00', '22:00:00'),
(27, '2015-11-03 08:00:00', '2015-11-04 11:00:00', '08:00:00', '22:00:00'),
(28, '2015-11-03 08:00:00', '2015-11-05 11:00:00', '08:00:00', '22:00:00'),
(29, '2015-11-03 08:00:00', '2015-11-06 11:00:00', '08:00:00', '22:00:00'),
(30, '2015-11-03 08:00:00', '2015-11-07 11:00:00', '08:00:00', '22:00:00'),
(31, '2015-11-03 08:00:00', '2015-11-03 22:00:00', '08:00:00', '22:00:00'),
(32, '2015-11-03 08:00:00', '2015-11-04 22:00:00', '08:00:00', '22:00:00'),
(33, '2015-11-03 08:00:00', '2015-11-05 22:00:00', '08:00:00', '22:00:00'),
(34, '2015-11-03 08:00:00', '2015-11-06 22:00:00', '08:00:00', '22:00:00'),
(35, '2015-11-03 08:00:00', '2015-11-07 22:00:00', '08:00:00', '22:00:00'),
(36, '2015-11-03 08:00:00', '2015-11-03 23:00:00', '08:00:00', '22:00:00'),
(37, '2015-11-03 08:00:00', '2015-11-04 23:00:00', '08:00:00', '22:00:00'),
(38, '2015-11-03 08:00:00', '2015-11-05 23:00:00', '08:00:00', '22:00:00'),
(39, '2015-11-03 08:00:00', '2015-11-06 23:00:00', '08:00:00', '22:00:00'),
(40, '2015-11-03 08:00:00', '2015-11-07 23:00:00', '08:00:00', '22:00:00'),
(41, '2015-11-03 12:00:00', '2015-11-03 18:00:00', '08:00:00', '22:00:00'),
(42, '2015-11-03 12:00:00', '2015-11-04 18:00:00', '08:00:00', '22:00:00'),
(43, '2015-11-03 12:00:00', '2015-11-05 18:00:00', '08:00:00', '22:00:00'),
(44, '2015-11-03 12:00:00', '2015-11-06 18:00:00', '08:00:00', '22:00:00'),
(45, '2015-11-03 12:00:00', '2015-11-07 18:00:00', '08:00:00', '22:00:00'),
(46, '2015-11-03 12:00:00', '2015-11-03 22:00:00', '08:00:00', '22:00:00'),
(47, '2015-11-03 12:00:00', '2015-11-04 22:00:00', '08:00:00', '22:00:00'),
(48, '2015-11-03 12:00:00', '2015-11-05 22:00:00', '08:00:00', '22:00:00'),
(49, '2015-11-03 12:00:00', '2015-11-06 22:00:00', '08:00:00', '22:00:00'),
(50, '2015-11-03 12:00:00', '2015-11-07 22:00:00', '08:00:00', '22:00:00'),
(51, '2015-11-03 12:00:00', '2015-11-03 23:00:00', '08:00:00', '22:00:00'),
(52, '2015-11-03 12:00:00', '2015-11-04 23:00:00', '08:00:00', '22:00:00'),
(53, '2015-11-03 12:00:00', '2015-11-05 23:00:00', '08:00:00', '22:00:00'),
(54, '2015-11-03 12:00:00', '2015-11-06 23:00:00', '08:00:00', '22:00:00'),
(55, '2015-11-03 12:00:00', '2015-11-07 23:00:00', '08:00:00', '22:00:00'),
(56, '2015-11-03 22:00:00', '2015-11-03 23:00:00', '08:00:00', '22:00:00'),
(57, '2015-11-03 22:00:00', '2015-11-04 23:00:00', '08:00:00', '22:00:00'),
(58, '2015-11-03 22:00:00', '2015-11-05 23:00:00', '08:00:00', '22:00:00'),
(59, '2015-11-03 22:00:00', '2015-11-06 23:00:00', '08:00:00', '22:00:00'),
(60, '2015-11-03 22:00:00', '2015-11-07 23:00:00', '08:00:00', '22:00:00'),
(61, '2015-11-03 22:30:00', '2015-11-03 23:30:00', '08:00:00', '22:00:00'),
(62, '2015-11-03 22:30:00', '2015-11-04 23:30:00', '08:00:00', '22:00:00'),
(63, '2015-11-03 22:30:00', '2015-11-05 23:30:00', '08:00:00', '22:00:00'),
(64, '2015-11-03 22:30:00', '2015-11-06 23:30:00', '08:00:00', '22:00:00'),
(65, '2015-11-03 22:30:00', '2015-11-07 23:30:00', '08:00:00', '22:00:00');
-- select query to get work time difference
SELECT
start_datetime,
end_datetime,
start_work_time,
end_work_time,
get_working_time(start_datetime, end_datetime, start_work_time, end_work_time) AS diff_in_minutes
FROM
test_working_time;
Это даст разницу только рабочих часов в секундах между начальной и конечной датой и временем