Database corruption

Learn about the critical 823 and 824 errors in SQL Server and how to deal with them in this article.

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2025-12-01

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Fixing system database corruption with setup.exe

Corruption of the system databases is a serious matter. Setup.exe is a brute force method of replacing them.

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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?