Обсуждение: Re: Adding an INTERVAL to a variable

>>>>> "GC" == Graham Coates <graham@mindvision.com.au> writes:

GC> SELECT Invoices.InvoiceDate + INTERVAL '41 Days'
GC> works fine
GC> but when trying to substitute the number of days with a value form a field
GC> e.g.

GC> SELECT Invoices.InvoiceDate + INTERVAL Acct.AverageDaysToPay 'Days'

try 
SELECT Invoices.InvoiceDate + Acct.AverageDaysToPay::interval



-- 
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Vivek Khera, Ph.D.                Khera Communications, Inc.
Internet: khera@kciLink.com       Rockville, MD       +1-240-453-8497
AIM: vivekkhera Y!: vivek_khera   http://www.khera.org/~vivek/

Graham,

> GC> SELECT Invoices.InvoiceDate + INTERVAL Acct.AverageDaysToPay
> 'Days'

Actually, all you're missing is some punctuation.  Don't skimp on the ::
and () !  Plus, you should use explicit CASTs wherever you remember
them:

SELECT Invoices.InvoiceDate + INTERVAL(CAST(Acct.AverageDaysToPay AS
VARCHAR) || ' days');

Will work fine.  Here I've explicitly cast the Average Days integer (if
it's NUMERIC or FLOAT, you will have to use TO_CHAR()) to varchar, then
concatinated it with the  word "days".  *Then* I convert it to INTERVAL,
which will recognize '# days' as a valid expression.

IMHO, you've been lucky being able to skip the parens and CASTs so far;
get used to using them.

-Josh



______AGLIO DATABASE SOLUTIONS___________________________
                                       Josh Berkus
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Thanks for the inspiration Vivek!
Didn't quite work, but when I made it...
dSalesHdrDateDue + (iAcctPayDaysAv || 'Days')::INTERVAL

BINGO! it works.
Happiness is :-)

Graham Coates


"Vivek Khera" <khera@kcilink.com> wrote in message
news:x73d737w54.fsf@onceler.kciLink.com...
> >>>>> "GC" == Graham Coates <graham@mindvision.com.au> writes:
>
> GC> SELECT Invoices.InvoiceDate + INTERVAL '41 Days'
> GC> works fine
> GC> but when trying to substitute the number of days with a value form a
field
> GC> e.g.
>
> GC> SELECT Invoices.InvoiceDate + INTERVAL Acct.AverageDaysToPay 'Days'
>
> try
>
>  SELECT Invoices.InvoiceDate + Acct.AverageDaysToPay::interval
>
>
>
> --
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
> Vivek Khera, Ph.D.                Khera Communications, Inc.
> Internet: khera@kciLink.com       Rockville, MD       +1-240-453-8497
> AIM: vivekkhera Y!: vivek_khera   http://www.khera.org/~vivek/