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create table deal ( start_date date, end_date date, "sum" integer ); insert into deal values ('2010-01-01', '2011-01-01', 3), ('2010-01-01', '2010-04-01', 5), ('2011-01-01', '2012-01-01', 1); select '2010-05-01' as "date", sum("sum") from deal where '2010-05-01'::date between start_date and end_date union select '2010-02-01', sum("sum") from deal where '2010-02-01'::date between start_date and end_date
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