SQLServerCentral Editorial

Double-Entry Bookkeeping for SQL Programmers

All defensive programmers should, in general, avoid unsupported techniques. However, there is a balance to be struck between adherence to 'best practice' approaches to SQL programming, and the need to get the job done. Perhaps certain critical code would benefit from use of the age-old practice of double entry bookkeeping?

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Question of the Day

Getting the Average

I have this data in the dbo.Commission table in a SQL Server 2022 database.

salesperson commission
Brian       12
Brian       16
Andy        7
Andy        14
Andy        21
Steve       20
Steve       NULL
All the data is a varchar, and I decide to run this query to get the totals for each salesperson.
SELECT SalesPerson
     , AVG(TRY_PARSE(Commission AS int)) AS TotalCommission
 FROM commission
 GROUP BY SalesPerson
GO
What average commission is calculated for Steve?

See possible answers