Re: using a generated series in function

Hi John,

Well, maybe the best would be to say on english what you want to achieve...

From SQL code in your mail - it is not clear ( at least to me...)

but: SELECT now() - it will just execute function ant there is not possible
to say WHERE in that...

and like you said:

*select function_name(integer, date); -- function returns a numeric*
*
*
it works - there is no place for WHERE...

If the query have WHERE - then it also at leasy must have FROM clausule...

Kind Regards,

Misa

2011/12/16 John Fabiani <johnf(at)jfcomputer(dot)com>

> Actually what would the "from" be - this could be a newbie issue here?
> Neither statement requires a "from" because neither of the statements uses
> a
> table - I think! I'll try to add one but the first part is a function
> like a
> any other function. What is the "from" when you do:
> "select now()" - really I don't know!
>
> The second part is tricky because I don't really understand it. Howerver,
> I
> have used it several times (got it off the web somewhere) but only in a
> "for
> loop". If I just run it by it's self it generates a table of dates.
> Therefore, I have always thought of it as a function. Again, like "select
> now()"
>
> So I know this must sound like I'm sort of idiot - just never considered
> the
> second half (the part that provides the dates) anything other than a
> postgres
> function.
>
> Johnf
>
>
> On Friday, December 16, 2011 01:30:53 AM Misa Simic wrote:
> > It is not totally clear to me what are u trying to do... But in second
> > query it seems there is missing "from"
> >
> > It is as
> >
> > SELECT week-date::date AS week-date WHERE week-date in (subquery which
> > have from)
> >
> > So week-date column in main query does not exist..
> >
> > Sent from my Windows Phone From: John Fabiani
> > Sent: 16 December 2011 05:16
> > To: pgsql-sql(at)postgresql(dot)org
> > Subject: [SQL] using a generated series in function
> > Hi,
> >
> > I am attempting (without success) use the generated series of dates that
> > come from:
> > select (cast(date_trunc('week', '2011-11-20'::date ) as date) + (i+6)) as
> > week_date from generate_series(0,84,7) i
> >
> > in a function.
> > select function_name(integer, date); -- function returns a numeric
> >
> > This does NOT work:
> > select (function_name(303, week_date::date)) as week_date where
> week_date in
> > (select (cast(date_trunc('week', '2011-11-20'::date ) as date) + (i+6))
> as
> > week_date from generate_series(0,84,7) i )
> >
> > The error is:
> > ERROR: column "week_date" does not exist
> > LINE 1: select (xchromasun._chromasun_getqtyordered(303, week_date::...
> >
> > I hope I can do this? What am I doing wrong?
> > Johnf
>
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