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I want to select sql:
SELECT "year-month" from table group by "year-month" AND order by date, where
year-month – format for date “1978-01″,”1923-12”.
select to_char of couse work, but not “right” order:
to_char(timestamp_column, 'YYYY-MM')
e.g.
http://www.postgresql.org/docs/8.0/interactive/functions-datetime.html