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SQL functions RANK(), PERCENT_RANK(), CUME_DIST() and NTILE()
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CREATE TABLE test_rank ( | |
i integer, | |
s varchar(1) | |
); | |
INSERT INTO test_rank (i, s) VALUES (1, 'A'); | |
INSERT INTO test_rank (i, s) VALUES (2, 'B'); | |
INSERT INTO test_rank (i, s) VALUES (2, 'b'); | |
INSERT INTO test_rank (i, s) VALUES (3, 'D'); | |
INSERT INTO test_rank (i, s) VALUES (4, 'E'); | |
SELECT | |
ROW_NUMBER() OVER (ORDER BY i), | |
RANK() OVER (ORDER BY i), | |
DENSE_RANK() OVER (ORDER BY i), | |
PERCENT_RANK() OVER (ORDER BY i), | |
CUME_DIST() OVER (ORDER BY i), | |
NTILE(4) OVER (ORDER BY i), | |
s | |
FROM test_rank ORDER BY i, s; | |
row_number | rank | dense_rank | percent_rank | cume_dist | ntile | s | |
------------+------+------------+--------------+-----------+-------+--- | |
1 | 1 | 1 | 0 | 0.2 | 1 | A | |
2 | 2 | 2 | 0.25 | 0.6 | 1 | B | |
3 | 2 | 2 | 0.25 | 0.6 | 2 | b | |
4 | 4 | 3 | 0.75 | 0.8 | 3 | D | |
5 | 5 | 4 | 1 | 1 | 4 | E | |
(5 rows) |
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