From: Aaron Bono <postgresql@aranya.com>
To: joseppi c <joseppic@yahoo.co.uk>
Cc: pgsql-sql@postgresql.org
Subject: Re: Date ranges + DOW select question
Date: Thu, 22 Jun 2006 10:25:06 -0500
Message-ID: <bf05e51c0606220825v29e4319w8736c3183cfbdb5d@mail.gmail.com> (raw)
In-Reply-To: <20060615101412.3443.qmail@web25413.mail.ukl.yahoo.com>
References: <20060615101412.3443.qmail@web25413.mail.ukl.yahoo.com>
I am a little confused. Where are you casting dateStart and dateEnd? I
don't see either in your query. I assume dayOfWeek is a number between 0
and 6, or maybe not?
A little more detail would help.
Thanks,
Aaron Bono
On 6/15/06, joseppi c <joseppic@yahoo.co.uk> wrote:
>
> Hi,
> I have a table which contains starttime, endtime and
> DOW; i.e. a weekly list of times for when a process
> must be started and ended.
>
> TABLE: cronTimes
> FIELDS: starttime, endtime, dayOfWeek
>
> I have another table which contains date ranges.
>
> TABLE: dateRanges
> FIELDS: dateStart, dateEnd
>
> I need to get a list of cronTimes records for a record
> in dateRanges and push these to a temporary table.
> i.e. tell me which dates are affected by cronTimes.
>
> I have got a little way on this but need some
> assistance.
>
> SELECT * FROM cronTimes WHERE
> starttime >= '00:00:00' AND endtime <= '23:59:59'
> AND dayOfWeek >= (EXTRACT(DOW FROM TIMESTAMP
> '2006-06-26')) AND dayOfWeek <= (EXTRACT(DOW FROM
> TIMESTAMP '2006-07-04'));
>
> The problem with the above is that by casting the
> dateStart and dateEnd they become numbers between 0
> and
> 6 which inturn invalidates the < & > as they are
> nolonger working on dates, nor a sequence as numbers
> can be repeated.
>
> Do I need to generate a sequence of dates somehow so
> that each date in the range can be compared to the
> cronTimes table (so I can use the 'IN' condition)?
>
> Am I in the realms of plpgsql?
>
> Any advice on the above welcome.
>
> Joseppic.
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To: pgsql-sql@postgresql.org
Cc: postgresql@aranya.com, joseppic@yahoo.co.uk
Subject: Re: Date ranges + DOW select question
In-Reply-To: <bf05e51c0606220825v29e4319w8736c3183cfbdb5d@mail.gmail.com>
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