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help / color / mirror / Atom feedFrom: Rob Sargent <robjsargent@gmail.com>
To: pgsql-sql@postgresql.org
Subject: Re: how many times
Date: Wed, 23 Aug 2017 12:15:52 -0600
Message-ID: <864a1386-2c98-5060-1a72-d663671af917@gmail.com> (raw)
In-Reply-To: <B75CD08C73BD3543B97E4EF3964B7D7047D3E9E8@CITESMBX1.ad.uillinois.edu>
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On 08/23/2017 12:03 PM, Campbell, Lance wrote:
>
> I am not for sure how to do the below. I was hoping someone could
> share their thoughts.
>
> Assume I have a table called T1. It contains a single filed called
> “viewed” that is of type timestamp.
>
> Every time someone views a particular web page we insert the current
> timestamp into T1.
>
> Now I need to ask this business question:
>
> On average in any consecutive five minute time frame how many times is
> the web page viewed?
>
> Thanks,
>
> Lance
>
window functions are your friends
https://www.postgresql.org/docs/current/static/functions-window.html
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Subject: Re: how many times
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