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? ??? ??? MySQL ???? PostgreSQL?? ?? ?? ??? ?? ?? ???? ??? ??????

PostgreSQL?? ?? ?? ??? ?? ?? ???? ??? ??????

Dec 19, 2024 pm 04:14 PM

How to Count Previous Rows Within a Time Range in PostgreSQL?

?? ?? ?? ?? ? ??

PostgreSQL??? ??? ?? ??? ?? ?? ?? ?? ???? ? ?? ??? ? ????. ? ??? ???? ?.

? ???? RANGE ??(Postgres 11 ?? ??)

Postgres 11 ??? ?? RANGE ??? ???? PRECEDING ? EXCLUDE ??? ???? ?? ??? ??? ? ????.

SELECT id, ts
, count(*) OVER (ORDER BY ts RANGE '1 hour' PRECEDING EXCLUDE CURRENT ROW)
FROM test
ORDER BY ts;

?? PostgreSQL ??

?? ??? PostgreSQL? ?? ?? ?? ??? ??? ????. ?? ??:

Roman's Query(ROM)

SELECT id, ts
, (SELECT count(*)::int - 1
FROM unnest(dates) x
WHERE x >= sub.ts - interval '1h') AS ct
FROM (
SELECT id, ts
, array_agg(ts) OVER (ORDER BY ts) AS dates
FROM test
) sub;

?? ??(ARR)

SELECT id, ts
, (SELECT count(*)
FROM test t1
WHERE t1.ts >= t.ts - interval '1h'
AND t1.ts < t.ts) AS ct
FROM test t
ORDER BY ts;

PL/pgSQL ?? (FNC)

CREATE OR REPLACE FUNCTION running_window_ct(_intv interval = '1 hour')
RETURNS TABLE (id bigint, ts timestamp, ct int) AS
$func$
DECLARE
cur CURSOR FOR
SELECT t.ts + _intv AS ts1
, row_number() OVER (ORDER BY t.ts ROWS UNBOUNDED PRECEDING) AS rn
FROM test t
ORDER BY t.ts;
rec record;
rn int;
BEGIN
OPEN cur;
FETCH cur INTO rec;
ct := -1;

FOR id, ts, rn IN
SELECT t.id, t.ts, row_number() OVER (ORDER BY t.ts ROWS UNBOUNDED PRECEDING)
FROM test t ORDER BY t.ts
LOOP
IF rec.ts1 >= ts THEN
ct := ct + 1;
ELSE
LOOP
FETCH cur INTO rec;
EXIT WHEN rec.ts1 >= ts;
END LOOP;
ct := rn - rec.rn;
END IF;

RETURN NEXT;
END LOOP;
END
$func$;

??? ?? ???? ?? ??:

SELECT * FROM running_window_ct('1 hour');

? ??? PostgreSQL?? ?? ?? ??? ?? ?? ???? ??? ??????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!

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