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select version();
version
PostgreSQL 13.1 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 8.3.1 20191121 (Red Hat 8.3.1-5), 64-bit
…
hidden batch(es)
CREATE TABLE test
(
the_date TIMESTAMP NOT NULL
);
✓
hidden batch(es)
INSERT INTO test VALUES
('2021-06-23 05:47:05'::TIMESTAMPTZ), -- NO gaps > 3 hours on this date!
('2021-06-23 07:47:05'::TIMESTAMPTZ),
('2021-06-23 09:47:05'::TIMESTAMPTZ),
('2021-06-23 11:47:05'::TIMESTAMPTZ),
('2021-06-23 13:47:05'::TIMESTAMPTZ),
('2021-06-23 14:47:05'::TIMESTAMPTZ),
('2021-06-23 16:47:05'::TIMESTAMPTZ),
('2021-06-23 17:47:05'::TIMESTAMPTZ),
('2021-06-24 05:47:05'::TIMESTAMPTZ), -- TWO gaps > 3 hours on this date
-- 1st gap > 3 hours
('2021-06-24 09:47:05'::TIMESTAMPTZ),
-- 2nd gap > 3 hours
('2021-06-24 13:47:05'::TIMESTAMPTZ),
('2021-06-24 14:47:05'::TIMESTAMPTZ), -- added for testing
('2021-06-24 16:47:05'::TIMESTAMPTZ), -- added for testing
('2021-06-24 17:47:05'::TIMESTAMPTZ);
14 rows affected
hidden batch(es)
WITH long_gaps AS
(
SELECT dat, MIN(td)
FROM
(
SELECT
the_date::DATE AS dat, the_date AS td, LEAD(the_date)
OVER (PARTITION BY the_date::DATE) AS l_td
FROM
test
) AS t1
WHERE l_td - td > INTERVAL '3 HOUR'
GROUP BY dat
),
short_gaps AS
(
SELECT the_date::DATE AS dat2, MAX(the_date)
FROM test
WHERE the_date::DATE NOT IN (SELECT dat FROM long_gaps)
GROUP BY dat2
)
SELECT * FROM long_gaps
UNION ALL
SELECT * FROM short_gaps
ORDER BY dat;
dat
min
2021-06-23
2021-06-23 17:47:05
2021-06-24
2021-06-24 05:47:05
…
hidden batch(es)
WITH long_gaps AS
(
SELECT
the_date::DATE AS dat, the_date AS td, LEAD(the_date)
OVER (PARTITION BY the_date::DATE) AS l_td
FROM
test
)
SELECT DISTINCT ON(dat)
dat, td
FROM long_gaps
WHERE l_td - td > INTERVAL '3 HOUR'
OR l_td IS NULL
ORDER BY dat, td ;
dat
td
2021-06-23
2021-06-23 17:47:05
2021-06-24
2021-06-24 05:47:05
…
hidden batch(es)
WITH gaps AS
(
SELECT
the_date::DATE AS dat, the_date AS td,
LEAD(the_date)
OVER (PARTITION BY the_date::DATE) AS l_td
FROM
test
),
long_gaps AS
(
SELECT
dat, td,
ROW_NUMBER()
OVER (PARTITION BY dat ORDER BY td) AS rn
FROM gaps
WHERE l_td - td > INTERVAL '3 HOUR'
OR l_td IS NULL
)
SELECT
dat, td
FROM long_gaps
WHERE rn = 1
ORDER BY dat, td ;
