Re: Date for a week day of a month

am Tue, dem 03.07.2007, um 14:27:24 -0400 mailte Emi Lu folgendes:
> Hello,
>
> Can I know how to get the date of each month's last Thursday please?
>
> For example, something like
>
> Query: select getDateBaseOnWeekday('2007-04-01', 'Last Thursday');
> Result: 2007-04-26

Write you own function. You can get the last date for a month like this:
select '2007-04-01'::date+'1month'::interval-'1day'::interval;

You can get the weekday with:
select extract('dow' from '2007-04-01'::date+'1month'::interval-'1day'::interval);

Now you know the weekday. If this value = 4, its okay. If not, subtract
days until the date is a Thursday.

Andreas
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Andreas Kretschmer
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