350 lines
14 KiB
SQL
350 lines
14 KiB
SQL
--
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-- WINDOW FUNCTIONS
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--
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-- Enforce use of COMMIT instead of 2PC for temporary objects
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SET enforce_two_phase_commit TO off;
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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 1, 2, 3, 4;
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SELECT depname, empno, salary, rank() OVER (PARTITION BY depname ORDER BY salary) FROM empsalary ORDER BY 1, 2, 3, 4;
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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) ORDER BY empno,salary;
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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,empno;
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-- empty window specification
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SELECT COUNT(*) OVER () FROM tenk1 WHERE unique2 < 10 ORDER BY 1;
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SELECT COUNT(*) OVER w FROM tenk1 WHERE unique2 < 10 WINDOW w AS () ORDER BY 1;
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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 ORDER BY 1, 2, 3;
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SELECT row_number() OVER (ORDER BY unique2) FROM tenk1 WHERE unique2 < 10 ORDER BY 1;
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SELECT rank() OVER (PARTITION BY four ORDER BY ten) AS rank_1, ten, four FROM tenk1 WHERE unique2 < 10 ORDER BY 1, 2, 3;
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SELECT dense_rank() OVER (PARTITION BY four ORDER BY ten), ten, four FROM tenk1 WHERE unique2 < 10 ORDER BY 1, 2, 3;
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SELECT percent_rank() OVER (PARTITION BY four ORDER BY ten), ten, four FROM tenk1 WHERE unique2 < 10 ORDER BY 1, 2, 3;
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SELECT cume_dist() OVER (PARTITION BY four ORDER BY ten), ten, four FROM tenk1 WHERE unique2 < 10 ORDER BY 1, 2, 3;
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SELECT ntile(3) OVER (ORDER BY ten, four), ten, four FROM tenk1 WHERE unique2 < 10 ORDER BY 1, 2, 3;
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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 ORDER BY 1, 2, 3;
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SELECT lag(ten, four) OVER (PARTITION BY four ORDER BY ten), ten, four FROM tenk1 WHERE unique2 < 10 ORDER BY 1, 2, 3;
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SELECT lag(ten, four, 0) OVER (PARTITION BY four ORDER BY ten), ten, four FROM tenk1 WHERE unique2 < 10 ORDER BY 1, 2, 3;
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SELECT lead(ten) OVER (PARTITION BY four ORDER BY ten), ten, four FROM tenk1 WHERE unique2 < 10 ORDER BY 1, 2, 3;
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SELECT lead(ten * 2, 1) OVER (PARTITION BY four ORDER BY ten), ten, four FROM tenk1 WHERE unique2 < 10 ORDER BY 1, 2, 3;
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SELECT lead(ten * 2, 1, -1) OVER (PARTITION BY four ORDER BY ten), ten, four FROM tenk1 WHERE unique2 < 10 ORDER BY 1, 2, 3;
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SELECT first_value(ten) OVER (PARTITION BY four ORDER BY ten), ten, four FROM tenk1 WHERE unique2 < 10 ORDER BY 1, 2, 3;
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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, four), ten, four FROM tenk1 WHERE unique2 < 10 ORDER BY 1, 2, 3;
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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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ORDER BY four, ten;
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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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ORDER 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 ORDER BY 1, 2;
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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 ORDER BY 1;
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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 ORDER BY 1;
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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) ORDER BY 1, 2, 3, 4;
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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) ORDER BY 1, 2;
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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 ORDER BY 1;
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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) ORDER BY 1, 2;
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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 ORDER BY empno;
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-- window function over ungrouped agg over empty row set (bug before 9.1)
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SELECT SUM(COUNT(f1)) OVER () FROM int4_tbl WHERE f1=42;
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-- window function with ORDER BY an expression involving aggregates (9.1 bug)
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select ten,
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sum(unique1) + sum(unique2) as res,
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rank() over (order by sum(unique1) + sum(unique2)) as rank
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from tenk1
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group by ten order by ten;
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-- window and aggregate with GROUP BY expression (9.2 bug)
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explain (costs off, nodes off)
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select first_value(max(x)) over (), y
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from (select unique1 as x, ten+four as y from tenk1) ss
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group by y;
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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 ORDER BY 1, 2, 3, 4;
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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 ORDER BY 1, 2, 3, 4;
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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 ORDER BY 1, 2, 3, 4;
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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 ORDER BY 1, 2, 3, 4;
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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 ORDER BY 1, 2, 3, 4;
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SELECT sum(unique1) over (order by four, unique1 range between current row and unbounded following),
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unique1, four
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FROM tenk1 WHERE unique1 < 10;
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SELECT sum(unique1) over (rows between current row and unbounded following),
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unique1, four
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FROM (SELECT unique1, four FROM tenk1 WHERE unique1 < 10 ORDER BY 1, 2) stenk1 ORDER BY 1, 2, 3;
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SELECT sum(unique1) over (rows between 2 preceding and 2 following),
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unique1, four
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FROM (SELECT unique1, four FROM tenk1 WHERE unique1 < 10 ORDER BY 1, 2) stenk1 ORDER BY 1, 2, 3;
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SELECT sum(unique1) over (rows between 2 preceding and 1 preceding),
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unique1, four
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FROM (SELECT unique1, four FROM tenk1 WHERE unique1 < 10 ORDER BY 1, 2) stenk1 ORDER BY 1, 2, 3;
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SELECT sum(unique1) over (rows between 1 following and 3 following),
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unique1, four
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FROM (SELECT unique1, four FROM tenk1 WHERE unique1 < 10 ORDER BY 1, 2) stenk1 ORDER BY 1, 2, 3;
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SELECT sum(unique1) over (rows between unbounded preceding and 1 following),
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unique1, four
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FROM (SELECT unique1, four FROM tenk1 WHERE unique1 < 10 ORDER BY 1, 2) stenk1 ORDER BY 1, 2, 3;
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SELECT sum(unique1) over (w range between current row and unbounded following),
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unique1, four
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FROM tenk1 WHERE unique1 < 10 WINDOW w AS (order by four, unique1);
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-- fail: not implemented yet
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SELECT sum(unique1) over (order by four, ten, unique1 range between 2::int8 preceding and 1::int2 preceding),
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unique1, four
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FROM tenk1 WHERE unique1 < 10;
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SELECT first_value(unique1) over w,
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nth_value(unique1, 2) over w AS nth_2,
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last_value(unique1) over w, unique1, four
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FROM tenk1 WHERE unique1 < 10
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WINDOW w AS (order by four, ten, unique1 range between current row and unbounded following);
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SELECT sum(unique1) over
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(order by unique1
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rows (SELECT unique1 FROM tenk1 ORDER BY unique1 LIMIT 1) + 1 PRECEDING),
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unique1
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FROM (SELECT unique1, four FROM tenk1 WHERE unique1 < 10 ORDER BY 1, 2) stenk1;
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CREATE TEMP VIEW v_window AS
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SELECT i, sum(i) over (order by i rows between 1 preceding and 1 following) as sum_rows
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FROM generate_series(1, 10) i;
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SELECT * FROM v_window;
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SELECT pg_get_viewdef('v_window');
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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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-- can't order by another window function
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SELECT rank() OVER (ORDER BY rank() OVER (ORDER BY random()));
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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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CREATE TABLE DISTRIBUTE_WINDOW_T1(A INT, B INT, C INT, D INT);
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INSERT INTO DISTRIBUTE_WINDOW_T1 VALUES (GENERATE_SERIES(1, 2), GENERATE_SERIES(1, 3), GENERATE_SERIES(1, 5), GENERATE_SERIES(1, 7));
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EXPLAIN (COSTS OFF, VERBOSE ON)
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SELECT
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RANK() OVER (PARTITION BY A ORDER BY B, C, D),
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A, B, C, D,
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SUM(A) OVER (PARTITION BY A ORDER BY B, C, D),
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SUM(B) OVER (PARTITION BY B ORDER BY A, C, D),
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SUM(C) OVER (PARTITION BY C ORDER BY A, B, D),
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SUM(D) OVER (PARTITION BY D ORDER BY A, B, C)
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FROM DISTRIBUTE_WINDOW_T1 ORDER BY 1, 2, 3, 4, 5;
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SELECT
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RANK() OVER (PARTITION BY A ORDER BY B, C, D),
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A, B, C, D,
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SUM(A) OVER (PARTITION BY A ORDER BY B, C, D),
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SUM(B) OVER (PARTITION BY B ORDER BY A, C, D),
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SUM(C) OVER (PARTITION BY C ORDER BY A, B, D),
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SUM(D) OVER (PARTITION BY D ORDER BY A, B, C)
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FROM DISTRIBUTE_WINDOW_T1 ORDER BY 1, 2, 3, 4, 5;
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DROP TABLE DISTRIBUTE_WINDOW_T1;
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CREATE TABLE DISTRIBUTE_WINDOW_T1(ID INT ,NAME VARCHAR(20),ZIP VARCHAR(20));
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CREATE TABLE DISTRIBUTE_WINDOW_T2(ID INT,STREET VARCHAR(20),ZIP VARCHAR(20),C_D_ID INT,C_ID INT) ;
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CREATE TABLE DISTRIBUTE_WINDOW_T3(C_ID INT,STREET VARCHAR(20),ZIP VARCHAR(20) ,C_D_ID INT,ID INT) ;
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CREATE TABLE DISTRIBUTE_WINDOW_T4 (ID INTEGER,STREET VARCHAR(20),ZIP CHAR(9),C_D_ID INTEGER,C_W_ID INTEGER);
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EXPLAIN (COSTS OFF, VERBOSE ON)
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SELECT MAX(DT1.ID) OVER W
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FROM
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(
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SELECT DISTRIBUTE_WINDOW_T1.ID, DISTRIBUTE_WINDOW_T1.NAME, DISTRIBUTE_WINDOW_T1.ZIP
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FROM DISTRIBUTE_WINDOW_T1
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WHERE (DISTRIBUTE_WINDOW_T1.ID IN ( SELECT A.ID FROM DISTRIBUTE_WINDOW_T4 A WHERE NOT (EXISTS ( SELECT B.C_ID, B.STREET, B.ZIP, B.C_D_ID, B.ID FROM DISTRIBUTE_WINDOW_T2 B WHERE B.C_ID = A.ID)))) ORDER BY DISTRIBUTE_WINDOW_T1.ID, DISTRIBUTE_WINDOW_T1.NAME, DISTRIBUTE_WINDOW_T1.ZIP LIMIT 7
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) DT1 LEFT JOIN
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(
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SELECT A.ID, A.STREET, A.ZIP, A.C_D_ID, A.C_ID
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FROM DISTRIBUTE_WINDOW_T3 A
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RIGHT JOIN DISTRIBUTE_WINDOW_T4 B ON A.ID = B.ID::NUMERIC AND A.C_D_ID = B.C_D_ID
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WHERE A.ID IS NOT NULL
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)EXPLICIT_JOIN_02 ON DT1.ID=EXPLICIT_JOIN_02.ID
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WHERE DT1.ID>=1
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WINDOW W AS (PARTITION BY DT1.ZIP ORDER BY DT1.ID DESC)
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ORDER BY 1;
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SELECT MAX(DT1.ID) OVER W
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FROM
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(
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SELECT DISTRIBUTE_WINDOW_T1.ID, DISTRIBUTE_WINDOW_T1.NAME, DISTRIBUTE_WINDOW_T1.ZIP
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FROM DISTRIBUTE_WINDOW_T1
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WHERE (DISTRIBUTE_WINDOW_T1.ID IN ( SELECT A.ID FROM DISTRIBUTE_WINDOW_T4 A WHERE NOT (EXISTS ( SELECT B.C_ID, B.STREET, B.ZIP, B.C_D_ID, B.ID FROM DISTRIBUTE_WINDOW_T2 B WHERE B.C_ID = A.ID)))) ORDER BY DISTRIBUTE_WINDOW_T1.ID, DISTRIBUTE_WINDOW_T1.NAME, DISTRIBUTE_WINDOW_T1.ZIP LIMIT 7
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) DT1 LEFT JOIN
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(
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SELECT A.ID, A.STREET, A.ZIP, A.C_D_ID, A.C_ID
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FROM DISTRIBUTE_WINDOW_T3 A
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RIGHT JOIN DISTRIBUTE_WINDOW_T4 B ON A.ID = B.ID::NUMERIC AND A.C_D_ID = B.C_D_ID
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WHERE A.ID IS NOT NULL
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)EXPLICIT_JOIN_02 ON DT1.ID=EXPLICIT_JOIN_02.ID
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WHERE DT1.ID>=1
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WINDOW W AS (PARTITION BY DT1.ZIP ORDER BY DT1.ID DESC)
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ORDER BY 1;
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DROP TABLE DISTRIBUTE_WINDOW_T1;
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DROP TABLE DISTRIBUTE_WINDOW_T2;
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DROP TABLE DISTRIBUTE_WINDOW_T3;
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DROP TABLE DISTRIBUTE_WINDOW_T4;
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CREATE FUNCTION nth_value_def(val anyelement, n integer = 1) RETURNS anyelement
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LANGUAGE internal WINDOW IMMUTABLE STRICT AS 'window_nth_value';
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SELECT nth_value_def(ten) OVER (PARTITION BY four order by unique1) as No1, *
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FROM (SELECT * FROM tenk1 WHERE unique2 < 10 ORDER BY four, ten) s order by No1;
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