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8e8854daa2
patch. This includes the ability to force the frame to cover the whole partition, and the ability to make the frame end exactly on the current row rather than its last ORDER BY peer. Supporting any more of the full SQL frame-clause syntax will require nontrivial hacking on the window aggregate code, so it'll have to wait for 8.5 or beyond.
199 lines
7.8 KiB
SQL
199 lines
7.8 KiB
SQL
--
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-- WINDOW FUNCTIONS
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--
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CREATE TEMPORARY TABLE empsalary (
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depname varchar,
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empno bigint,
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salary int,
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enroll_date date
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);
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INSERT INTO empsalary VALUES
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('develop', 10, 5200, '2007-08-01'),
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('sales', 1, 5000, '2006-10-01'),
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('personnel', 5, 3500, '2007-12-10'),
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('sales', 4, 4800, '2007-08-08'),
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('personnel', 2, 3900, '2006-12-23'),
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('develop', 7, 4200, '2008-01-01'),
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('develop', 9, 4500, '2008-01-01'),
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('sales', 3, 4800, '2007-08-01'),
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('develop', 8, 6000, '2006-10-01'),
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('develop', 11, 5200, '2007-08-15');
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SELECT depname, empno, salary, sum(salary) OVER (PARTITION BY depname) FROM empsalary ORDER BY depname, salary;
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SELECT depname, empno, salary, rank() OVER (PARTITION BY depname ORDER BY salary) FROM empsalary;
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-- with GROUP BY
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SELECT four, ten, SUM(SUM(four)) OVER (PARTITION BY four), AVG(ten) FROM tenk1
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GROUP BY four, ten ORDER BY four, ten;
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SELECT depname, empno, salary, sum(salary) OVER w FROM empsalary WINDOW w AS (PARTITION BY depname);
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SELECT depname, empno, salary, rank() OVER w FROM empsalary WINDOW w AS (PARTITION BY depname ORDER BY salary) ORDER BY rank() OVER w;
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-- empty window specification
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SELECT COUNT(*) OVER () FROM tenk1 WHERE unique2 < 10;
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SELECT COUNT(*) OVER w FROM tenk1 WHERE unique2 < 10 WINDOW w AS ();
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-- no window operation
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SELECT four FROM tenk1 WHERE FALSE WINDOW w AS (PARTITION BY ten);
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-- cumulative aggregate
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SELECT sum(four) OVER (PARTITION BY ten ORDER BY unique2) AS sum_1, ten, four FROM tenk1 WHERE unique2 < 10;
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SELECT row_number() OVER (ORDER BY unique2) FROM tenk1 WHERE unique2 < 10;
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SELECT rank() OVER (PARTITION BY four ORDER BY ten) AS rank_1, ten, four FROM tenk1 WHERE unique2 < 10;
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SELECT dense_rank() OVER (PARTITION BY four ORDER BY ten), ten, four FROM tenk1 WHERE unique2 < 10;
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SELECT percent_rank() OVER (PARTITION BY four ORDER BY ten), ten, four FROM tenk1 WHERE unique2 < 10;
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SELECT cume_dist() OVER (PARTITION BY four ORDER BY ten), ten, four FROM tenk1 WHERE unique2 < 10;
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SELECT ntile(3) OVER (ORDER BY ten, four), ten, four FROM tenk1 WHERE unique2 < 10;
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SELECT ntile(NULL) OVER (ORDER BY ten, four), ten, four FROM tenk1 LIMIT 2;
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SELECT lag(ten) OVER (PARTITION BY four ORDER BY ten), ten, four FROM tenk1 WHERE unique2 < 10;
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SELECT lag(ten, four) OVER (PARTITION BY four ORDER BY ten), ten, four FROM tenk1 WHERE unique2 < 10;
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SELECT lag(ten, four, 0) OVER (PARTITION BY four ORDER BY ten), ten, four FROM tenk1 WHERE unique2 < 10;
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SELECT lead(ten) OVER (PARTITION BY four ORDER BY ten), ten, four FROM tenk1 WHERE unique2 < 10;
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SELECT lead(ten * 2, 1) OVER (PARTITION BY four ORDER BY ten), ten, four FROM tenk1 WHERE unique2 < 10;
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SELECT lead(ten * 2, 1, -1) OVER (PARTITION BY four ORDER BY ten), ten, four FROM tenk1 WHERE unique2 < 10;
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SELECT first_value(ten) OVER (PARTITION BY four ORDER BY ten), ten, four FROM tenk1 WHERE unique2 < 10;
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-- last_value returns the last row of the frame, which is CURRENT ROW in ORDER BY window.
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SELECT last_value(four) OVER (ORDER BY ten), ten, four FROM tenk1 WHERE unique2 < 10;
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SELECT last_value(ten) OVER (PARTITION BY four), ten, four FROM
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(SELECT * FROM tenk1 WHERE unique2 < 10 ORDER BY four, ten)s
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ORDER BY four, ten;
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SELECT nth_value(ten, four + 1) OVER (PARTITION BY four), ten, four
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FROM (SELECT * FROM tenk1 WHERE unique2 < 10 ORDER BY four, ten)s;
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SELECT ten, two, sum(hundred) AS gsum, sum(sum(hundred)) OVER (PARTITION BY two ORDER BY ten) AS wsum
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FROM tenk1 GROUP BY ten, two;
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SELECT count(*) OVER (PARTITION BY four), four FROM (SELECT * FROM tenk1 WHERE two = 1)s WHERE unique2 < 10;
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SELECT (count(*) OVER (PARTITION BY four ORDER BY ten) +
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sum(hundred) OVER (PARTITION BY four ORDER BY ten))::varchar AS cntsum
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FROM tenk1 WHERE unique2 < 10;
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-- opexpr with different windows evaluation.
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SELECT * FROM(
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SELECT count(*) OVER (PARTITION BY four ORDER BY ten) +
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sum(hundred) OVER (PARTITION BY two ORDER BY ten) AS total,
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count(*) OVER (PARTITION BY four ORDER BY ten) AS fourcount,
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sum(hundred) OVER (PARTITION BY two ORDER BY ten) AS twosum
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FROM tenk1
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)sub
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WHERE total <> fourcount + twosum;
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SELECT avg(four) OVER (PARTITION BY four ORDER BY thousand / 100) FROM tenk1 WHERE unique2 < 10;
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SELECT ten, two, sum(hundred) AS gsum, sum(sum(hundred)) OVER win AS wsum
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FROM tenk1 GROUP BY ten, two WINDOW win AS (PARTITION BY two ORDER BY ten);
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-- more than one window with GROUP BY
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SELECT sum(salary),
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row_number() OVER (ORDER BY depname),
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sum(sum(salary)) OVER (ORDER BY depname DESC)
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FROM empsalary GROUP BY depname;
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-- identical windows with different names
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SELECT sum(salary) OVER w1, count(*) OVER w2
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FROM empsalary WINDOW w1 AS (ORDER BY salary), w2 AS (ORDER BY salary);
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-- subplan
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SELECT lead(ten, (SELECT two FROM tenk1 WHERE s.unique2 = unique2)) OVER (PARTITION BY four ORDER BY ten)
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FROM tenk1 s WHERE unique2 < 10;
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-- empty table
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SELECT count(*) OVER (PARTITION BY four) FROM (SELECT * FROM tenk1 WHERE FALSE)s;
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-- mixture of agg/wfunc in the same window
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SELECT sum(salary) OVER w, rank() OVER w FROM empsalary WINDOW w AS (PARTITION BY depname ORDER BY salary DESC);
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-- strict aggs
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SELECT empno, depname, salary, bonus, depadj, MIN(bonus) OVER (ORDER BY empno), MAX(depadj) OVER () FROM(
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SELECT *,
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CASE WHEN enroll_date < '2008-01-01' THEN 2008 - extract(YEAR FROM enroll_date) END * 500 AS bonus,
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CASE WHEN
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AVG(salary) OVER (PARTITION BY depname) < salary
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THEN 200 END AS depadj FROM empsalary
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)s;
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-- test non-default frame specifications
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SELECT four, ten,
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sum(ten) over (partition by four order by ten),
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last_value(ten) over (partition by four order by ten)
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FROM (select distinct ten, four from tenk1) ss;
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SELECT four, ten,
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sum(ten) over (partition by four order by ten range between unbounded preceding and current row),
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last_value(ten) over (partition by four order by ten range between unbounded preceding and current row)
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FROM (select distinct ten, four from tenk1) ss;
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SELECT four, ten,
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sum(ten) over (partition by four order by ten range between unbounded preceding and unbounded following),
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last_value(ten) over (partition by four order by ten range between unbounded preceding and unbounded following)
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FROM (select distinct ten, four from tenk1) ss;
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SELECT four, ten/4 as two,
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sum(ten/4) over (partition by four order by ten/4 range between unbounded preceding and current row),
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last_value(ten/4) over (partition by four order by ten/4 range between unbounded preceding and current row)
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FROM (select distinct ten, four from tenk1) ss;
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SELECT four, ten/4 as two,
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sum(ten/4) over (partition by four order by ten/4 rows between unbounded preceding and current row),
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last_value(ten/4) over (partition by four order by ten/4 rows between unbounded preceding and current row)
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FROM (select distinct ten, four from tenk1) ss;
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-- with UNION
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SELECT count(*) OVER (PARTITION BY four) FROM (SELECT * FROM tenk1 UNION ALL SELECT * FROM tenk2)s LIMIT 0;
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-- ordering by a non-integer constant is allowed
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SELECT rank() OVER (ORDER BY length('abc'));
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-- but this draws an error: "ORDER BY 1" means order by first SELECT column
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SELECT rank() OVER (ORDER BY 1);
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-- some other errors
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SELECT * FROM empsalary WHERE row_number() OVER (ORDER BY salary) < 10;
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SELECT * FROM empsalary INNER JOIN tenk1 ON row_number() OVER (ORDER BY salary) < 10;
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SELECT rank() OVER (ORDER BY 1), count(*) FROM empsalary GROUP BY 1;
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SELECT * FROM rank() OVER (ORDER BY random());
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DELETE FROM empsalary WHERE (rank() OVER (ORDER BY random())) > 10;
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DELETE FROM empsalary RETURNING rank() OVER (ORDER BY random());
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SELECT count(*) OVER w FROM tenk1 WINDOW w AS (ORDER BY unique1), w AS (ORDER BY unique1);
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SELECT rank() OVER (PARTITION BY four, ORDER BY ten) FROM tenk1;
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SELECT count() OVER () FROM tenk1;
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SELECT generate_series(1, 100) OVER () FROM empsalary;
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SELECT ntile(0) OVER (ORDER BY ten), ten, four FROM tenk1;
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SELECT nth_value(four, 0) OVER (ORDER BY ten), ten, four FROM tenk1;
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-- cleanup
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DROP TABLE empsalary;
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