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POMySQL - Calculating Net Dues against two tables
 

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  1. POMySQL - Calculating Net Dues against two tables
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    <p>Thanks in advance for any assistance. I am new to SQL and have looked at several related threads on this site, and numerous other sites on Google, but have not been able to figure out what I am doing wrong. I have looked at sub-selects, various JOIN options, and keeping bumping into the wrong solution/result. I have two tables that I am trying to do a query on. </p> <pre><code>Table:Doctors idDoctors PracticeID FirstName LastName Table: Vendor Sales Id ProductSales SalesCommission DoctorFirstName DoctorLastName </code></pre> <p>Here is the Query I am struggling with:</p> <pre><code>SELECT t1.PracticeID , SUM( t2.ProductSales ) AS Total_Sales , COUNT( t1.LastName ) AS Doctor_Count , COUNT( t1.LastName ) *150 AS Dues , SUM( t2.ProductSales * t2.SalesCommission ) AS Credit FROM Doctors AS t1 JOIN VendorSales AS t2 ON t1.Lastname = t2.DoctorLastName GROUP BY t1.PracticeID LIMIT 0 , 30 </code></pre> <p>The objective of the Query is to calculate net dues owed by a Practice. I am not yet attempting to calculate the net amount, just trying to get the initial calculations correct.</p> <p>Result (limited to one result for this example)</p> <pre><code>PracticeID Total_Sales Doctor_Count Dues Credit Practice A 16583.04 4 600 304.07360 </code></pre> <p>This is what the result should be:</p> <pre><code>PracticeID Total_Sales Doctor_Count Dues Credit Practice A 16583.04 3 450 304.07360 </code></pre> <p>The problem is that Total Sales sums the aggregate sales transactions (in this case 4 sales entries totaling 16584.04). Each of the 4 sales has an associated commission rate. The Credit amount is the total (sum) of the commission.<br> The sales and credit numbers are accurate. But the Doctor count should be 3 (number of Doctors in the practice). Dues should be $450 (150x3). But as you can see it is multiplying by 4 instead of 3. What do I need to change in the query to get the proper calculations (Doctors and dues multiplied by 3 instead of 4? Or should I be doing this differently? Thanks again.</p>
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