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From: Jonathan Katz <[email protected]>
To: [email protected]
Cc: pgsql-sql <[email protected]>
Subject: Re: Electricity bill
Date: Tue, 7 Jun 2022 21:42:27 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <CAPDmd-CjfhW5pSkthOGmb1rDpznDWYOetrhVh1gcquwQM9n5eA@mail.gmail.com>
References: <CAPDmd-CjfhW5pSkthOGmb1rDpznDWYOetrhVh1gcquwQM9n5eA@mail.gmail.com>


> On Jun 7, 2022, at 9:39 PM, Theodore M Rolle, Jr. <[email protected]> wrote:
> 
> I'm putting in YYYY-MM-DD dates of electricity bills and would like to not have starting and ending dates in the same row. Only ending date.
> Will someone show me the SQL to compute the months’ usage? This requires retrieving two rows to compute the number of days…

Based on your description, what I can offer right now is:

	SELECT date_trunc(‘month’, date_col), sum(val_col);

Jonathan

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