Postgres (PL/pgSQL) を使用してアルゴリズムを開発しています。週末は機能せず、残りの日は午前 8 時から午後 15 時までしかカウントされないことを考慮して、2 つのタイムスタンプ間の稼働時間数を計算する必要があります。
例:
12 月 3 日の午後 14 時から 12 月 4 日の午前 9 時までは 2 時間をカウントする必要があります。
3rd = 1, 4th = 1
12 月 3 日の午後 15 時から 12 月 7 日の午前 8 時までは 8 時間と見なす必要があります。
3rd = 0, 4th = 8, 5th = 0, 6th = 0, 7th = 0
時間の分数も考慮するとよいでしょう。
ご質問によると、勤務時間は月～金、08:00～15:00です。
1時間単位で運行。分数は無視されるため、正確ではありませんが単純です。
SELECT count(*) AS work_hours
FROM generate_series (timestamp '2013-06-24 13:30'
, timestamp '2013-06-24 15:29' - interval '1h'
, interval '1h') h
WHERE EXTRACT(ISODOW FROM h) < 6
AND h::time >= '08:00'
AND h::time <= '14:00';この関数generate_series()は、終了が開始よりも大きい場合に 1 つの行を生成し、指定された間隔 (1 時間)ごとに別の行を生成します。これは、 に入力された 1 時間ごとにカウントされます。端数時間を無視するには、末尾から 1 時間を引きます。また、14:00 より前の時間はカウントしないでください。
式を簡略化するには、 forISODOWの代わりにフィールド パターンを使用します。日曜日の代わりに戻ります。DOWEXTRACT()70
への単純な (そして非常に安価な) キャストtimeにより、適格な時間を簡単に識別できます。
間隔の開始時と終了時の端数の合計が 1 時間以上になる場合でも、時間の端数は無視されます。
CREATE TEMP TABLE t (t_id int PRIMARY KEY, t_start timestamp, t_end timestamp);
INSERT INTO t VALUES
(1, '2009-12-03 14:00', '2009-12-04 09:00')
,(2, '2009-12-03 15:00', '2009-12-07 08:00') -- examples in question
,(3, '2013-06-24 07:00', '2013-06-24 12:00')
,(4, '2013-06-24 12:00', '2013-06-24 23:00')
,(5, '2013-06-23 13:00', '2013-06-25 11:00')
,(6, '2013-06-23 14:01', '2013-06-24 08:59'); -- max. fractions at begin and end
クエリ:
SELECT t_id, count(*) AS work_hours
FROM (
SELECT t_id, generate_series (t_start, t_end - interval '1h', interval '1h') AS h
FROM t
) sub
WHERE EXTRACT(ISODOW FROM h) < 6
AND h::time >= '08:00'
AND h::time <= '14:00'
GROUP BY 1
ORDER BY 1;
精度を上げるには、より小さな時間単位を使用できます。たとえば、5 分間のスライス:
SELECT t_id, count(*) * interval '5 min' AS work_interval
FROM (
SELECT t_id, generate_series (t_start, t_end - interval '5 min', interval '5 min') AS h
FROM t
) sub
WHERE EXTRACT(ISODOW FROM h) < 6
AND h::time >= '08:00'
AND h::time <= '14:55' -- 15.00 - interval '5 min'
GROUP BY 1
ORDER BY 1;
単位が小さいほど、コストが高くなります。
LATERALPostgres 9.3 以降のクリーナーPostgres 9.3の新機能と組み合わせるとLATERAL、上記のクエリは次のように記述できます。
1 時間の精度:
SELECT t.t_id, h.work_hours
FROM t
LEFT JOIN LATERAL (
SELECT count(*) AS work_hours
FROM generate_series (t.t_start, t.t_end - interval '1h', interval '1h') h
WHERE EXTRACT(ISODOW FROM h) < 6
AND h::time >= '08:00'
AND h::time <= '14:00'
) h ON TRUE
ORDER BY 1;
5 分精度:
SELECT t.t_id, h.work_interval
FROM t
LEFT JOIN LATERAL (
SELECT count(*) * interval '5 min' AS work_interval
FROM generate_series (t.t_start, t.t_end - interval '5 min', interval '5 min') h
WHERE EXTRACT(ISODOW FROM h) < 6
AND h::time >= '08:00'
AND h::time <= '14:55'
) h ON TRUE
ORDER BY 1;
これには、上記のバージョンのように、ゼロ労働時間を含む間隔が結果から除外されないという追加の利点があります。
についての詳細LATERAL:
または、時間枠の開始と終了を別々に処理して、マイクロ秒までの正確な結果を取得します。クエリをより複雑にしますが、安価で正確です。
WITH var AS (SELECT '08:00'::time AS v_start
, '15:00'::time AS v_end)
SELECT t_id
, COALESCE(h.h, '0') -- add / subtract fractions
- CASE WHEN EXTRACT(ISODOW FROM t_start) < 6
AND t_start::time > v_start
AND t_start::time < v_end
THEN t_start - date_trunc('hour', t_start)
ELSE '0'::interval END
+ CASE WHEN EXTRACT(ISODOW FROM t_end) < 6
AND t_end::time > v_start
AND t_end::time < v_end
THEN t_end - date_trunc('hour', t_end)
ELSE '0'::interval END AS work_interval
FROM t CROSS JOIN var
LEFT JOIN ( -- count full hours, similar to above solutions
SELECT t_id, count(*)::int * interval '1h' AS h
FROM (
SELECT t_id, v_start, v_end
, generate_series (date_trunc('hour', t_start)
, date_trunc('hour', t_end) - interval '1h'
, interval '1h') AS h
FROM t, var
) sub
WHERE EXTRACT(ISODOW FROM h) < 6
AND h::time >= v_start
AND h::time <= v_end - interval '1h'
GROUP BY 1
) h USING (t_id)
ORDER BY 1;
tsrange新しい範囲型は、交差演算子と組み合わせて正確な結果を得るためのより洗練されたソリューションを提供します。*
1 日だけにまたがる時間範囲の単純な関数:
CREATE OR REPLACE FUNCTION f_worktime_1day(_start timestamp, _end timestamp)
RETURNS interval AS
$func$ -- _start & _end within one calendar day! - you may want to check ...
SELECT CASE WHEN extract(ISODOW from _start) < 6 THEN (
SELECT COALESCE(upper(h) - lower(h), '0')
FROM (
SELECT tsrange '[2000-1-1 08:00, 2000-1-1 15:00)' -- hours hard coded
* tsrange( '2000-1-1'::date + _start::time
, '2000-1-1'::date + _end::time ) AS h
) sub
) ELSE '0' END
$func$ LANGUAGE sql IMMUTABLE;
範囲が複数日にわたることがない場合は、それだけで十分です。
それ以外の場合は、このラッパー関数を使用して間隔を処理します。
CREATE OR REPLACE FUNCTION f_worktime(_start timestamp
, _end timestamp
, OUT work_time interval) AS
$func$
BEGIN
CASE _end::date - _start::date -- spanning how many days?
WHEN 0 THEN -- all in one calendar day
work_time := f_worktime_1day(_start, _end);
WHEN 1 THEN -- wrap around midnight once
work_time := f_worktime_1day(_start, NULL)
+ f_worktime_1day(_end::date, _end);
ELSE -- multiple days
work_time := f_worktime_1day(_start, NULL)
+ f_worktime_1day(_end::date, _end)
+ (SELECT count(*) * interval '7:00' -- workday hard coded!
FROM generate_series(_start::date + 1
, _end::date - 1, '1 day') AS t
WHERE extract(ISODOW from t) < 6);
END CASE;
END
$func$ LANGUAGE plpgsql IMMUTABLE;
電話：
SELECT t_id, f_worktime(t_start, t_end) AS worktime
FROM t
ORDER BY 1;
これはどうですか: 24*7 行の小さなテーブルを作成し、1 行が 1 週間の各時間に対応します。
CREATE TABLE hours (
hour timestamp not null,
is_working boolean not null
);
INSERT INTO hours (hour, is_working) VALUES
('2009-11-2 00:00:00', false),
('2009-11-2 01:00:00', false),
. . .
('2009-11-2 08:00:00', true),
. . .
('2009-11-2 15:00:00', true),
('2009-11-2 16:00:00', false),
. . .
('2009-11-2 23:00:00', false);
同様に、他の日についても 24 行追加します。すぐにわかるように、与える年月は関係ありません。週の 7 日間すべてを表す必要があるだけです。
SELECT t.id, t.start, t.end, SUM(CASE WHEN h.is_working THEN 1 ELSE 0 END) AS hours_worked
FROM mytable t JOIN hours h
ON (EXTRACT(DOW FROM TIMESTAMP h.hour) BETWEEN EXTRACT(DOW FROM TIMESTAMP t.start)
AND EXTRACT(DOW FROM TIMESTAMP t.end))
AND (EXTRACT(DOW FROM TIMESTAMP h.hour) > EXTRACT(DOW FROM TIMESTAMP t.start)
OR EXTRACT(HOUR FROM TIMESTAMP h.hour) >= EXTRACT(HOUR FROM TIMESTAMP t.start))
AND (EXTRACT(DOW FROM TIMESTAMP h.hour) < EXTRACT(DOW FROM TIMESTAMP t.end)
OR EXTRACT(HOUR FROM TIMESTAMP h.hour) <= EXTRACT(HOUR FROM TIMESTAMP t.end))
GROUP BY t.id, t.start, t.end;
この次の関数は、1 日の
勤務開始時刻、1 日の
勤務終了時刻、
開始時刻、
終了時刻の入力を受け取ります。
-- 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;
これにより、開始日時と終了日時の間の秒単位の作業時間のみの差が得られます