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PostgreSQL "pivot table" example using tablefunc extension
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| CREATE EXTENSION tablefunc; | |
| select * | |
| from (values (2007, 1, 1000), | |
| (2007, 2, 1500), | |
| (2007, 7, 500), | |
| (2007, 11, 1500), | |
| (2007, 12, 2000), | |
| (2008, 1, 1000), | |
| (2009, 5, 2500), | |
| (2009, 9, 800)) x (year, month, qty); | |
| year | month | qty | |
| ------+-------+------ | |
| 2007 | 1 | 1000 | |
| 2007 | 2 | 1500 | |
| 2007 | 7 | 500 | |
| 2007 | 11 | 1500 | |
| 2007 | 12 | 2000 | |
| 2008 | 1 | 1000 | |
| 2009 | 5 | 2500 | |
| 2009 | 9 | 800 | |
| (8 rows) | |
| select * | |
| from crosstab($$ | |
| select year, month, qty | |
| from (values (2007, 1, 1000), | |
| (2007, 2, 1500), | |
| (2007, 7, 500), | |
| (2007, 11, 1500), | |
| (2007, 12, 2000), | |
| (2008, 1, 1000), | |
| (2009, 5, 2500), | |
| (2009, 9, 800)) x (year, month, qty) | |
| order by 1 | |
| $$, | |
| $$ | |
| select m from generate_series(1,12) m | |
| $$ | |
| ) as ("Year" int, "Jan" int, "Feb" int, "Mar" int, "Apr" int, "May" int, "Jun" int, "Jul" int, "Aug" int, "Sep" int, "Oct" int, "Nov" int, "Dec" int); | |
| year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
| ------+------+------+-----+-----+------+-----+-----+-----+-----+-----+------+------ | |
| 2007 | 1000 | 1500 | | | | | 500 | | | | 1500 | 2000 | |
| 2008 | 1000 | | | | | | | | | | | | |
| 2009 | | | | | 2500 | | | | 800 | | | | |
| (3 rows) |
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