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POCumulative monthly reporting
 

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    <p>I have a MySQL table of photovoltaic electricity generation data (pvdata) from which I need to produce a monthly summary table. A simplified table is shown:</p> <p>id &nbsp; &nbsp; &nbsp; &nbsp; date &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; time &nbsp; &nbsp; &nbsp; pvdata<br> 1 &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 2012-01-01 &nbsp; &nbsp; 10:00 &nbsp; &nbsp; 50<br> 1 &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 2012-01-31 &nbsp; &nbsp; 12:00 &nbsp; &nbsp; 60<br> 1 &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 2012-02-10 &nbsp; &nbsp; 13:00 &nbsp; &nbsp;&nbsp;70<br> 2 &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 2012-02-08 &nbsp; &nbsp; 10:00 &nbsp; &nbsp; 12<br> 2 &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 2012-03-20 &nbsp; &nbsp; 10:00 &nbsp; &nbsp; 17<br></p> <p>The monthly summary table needs to show the cumulative generation for all systems in the database, regardless of whether I have received data for that month, so for example month 3 below contains the total generation from id = 1 (data received in month 2). </p> <p>Also there may be more than one data point for an id in the same month, so the report must report the max(data) for the month.</p> <p>year &nbsp; &nbsp; &nbsp; month &nbsp; &nbsp; cum_data<br> 2012 &nbsp; &nbsp;&nbsp; 1 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 60<br> 2012 &nbsp; &nbsp;&nbsp; 2 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 82<br> 2012 &nbsp; &nbsp;&nbsp; 3 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 87<br></p> <p>I am pretty new to this, so have struggled for a while. The best I can come up with shows the cumulative total for the month, but without including the cumulative total for ids for which there is no data in the current month:</p> <pre><code>CREATE TEMPORARY TABLE intermed_gen_report SELECT year(date) AS year, month(date) AS month, id, max(pvdata) AS maxpvdata FROM pvdata GROUP BY id, year(date), month(date) ORDER BY year(date), month(date); SELECT year, month, SUM(maxpvdata) AS cum_data FROM intermed_gen_report GROUP BY year, month ORDER BY year, month; </code></pre> <p>Giving: </p> <p>year &nbsp; &nbsp; &nbsp; month &nbsp; &nbsp; cum_data<br> 2012 &nbsp; &nbsp;&nbsp; 1 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 60<br> 2012 &nbsp; &nbsp;&nbsp; 2 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 82<br> 2012 &nbsp; &nbsp;&nbsp; 3 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 17<br></p>
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    1. COSo your query doesn't actually have to accumulate your data - it's already accumulated (in other words, you dont' have to add together all the months previous to this one for pvdata - whatever is the max pvdata is the value to use) right?
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    2. COYes, the data in the table is cumulative, so it would be an easy exercise if there was data for each ID every month. Unfortunately this is not the case but my report must still show the total amount for each ID every month.
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