Re: show all record between two date after group by and aggrigation...

> select cal.date, coalesce(foo.x, 0) AS x
>  from (select (date_trunc('day', current_timestamp) + (s.s * interval '1
> day'))::date AS date
>          from generate_series(1,365) AS s) AS cal
> left join foo ON cal.date = foo.create_date;

Why not, for the date part, the simpler alternative:

SELECT CURRENT_DATE + s.s AS DATE FROM generate_series(1, 365) AS s;