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POSumming sales across different currencies in SQL
 

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    <p>This is a follow-up to a previous questions I asked: <a href="https://stackoverflow.com/questions/8885572/using-a-group-by-statement-to-sum-rows">Using a GROUP BY statement to sum rows</a>. I have a table with sales of different currencies, and I am using a GROUP BY statement to sum up the numbers per title.</p> <pre><code>mysql&gt; SELECT title, SUM(us_earnings_usd) AS usd, SUM(cad_earnings_cad) AS cad, SUM(uk_earnings_gbp) AS gbp, SUM(swedish_earnings_skk) AS skk FROM raw_financials WHERE date="2012-12-01" GROUP BY title +--------+-----------------+------------------+------------------+------------------+ | title | us_earnings_usd | cad_earnings_cad |swedish_earnings_ | uk_earnings_gbp | +--------+-----------------+------------------+------------------+------------------+ | Gamers | 7.7500 | 4.0000 | 1.0000 | 2.0000 | +--------+-----------------+------------------+------------------+------------------+ </code></pre> <p>Finally, I need to sum up the fields to get the total sales in USD. For this, I have an additional table called <code>exchange_rates</code>. This is how it can be queried:</p> <pre><code>mysql&gt; SELECT currency, conversion_to_usd FROM exchange_rates WHERE date="2011-12-01"; +----------+-------------------+ | currency | conversion_to_usd | +----------+-------------------+ | AUD | 0.98542 | | CAD | 0.95940 | | CHF | 1.05235 | | DKK | 0.17372 | | EUR | 1.29400 | | GBP | 1.54223 | | NOK | 0.16579 | | NZD | 0.74442 | | SEK | 0.14190 | | USD | 1.00000 | +----------+-------------------+ </code></pre> <p>How would I combine these using SQL to get:</p> <pre><code>total_earnings_in_usd = 7.75 (earnings in usd) *1.00 (conversion from usd to usd) + 4.00 (earnings in cad) *0.95 (conversion from cad to usd) + 1.00 (earnings in sek) *0.14 (conversion from sek to usd) + 2.00 (earnings in gbp) *1.54 (conversion from gbp to usd) = $14.77 USD </code></pre> <p><strong>Update</strong>: I have updated the SQL in the question.</p>
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