Dan Ryan

Enforce business rules with indexed views and a two-row table

Here’s a technique that uses a view with a unique index and a dummy table with only two rows to trick SQL Server into enforcing your business rules.

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2012-08-20

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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?