Queries

You’ve got one SQL Server hosting a bunch of databases, and performance is bad. Which database should you focus on first?

2019-05-02

Using APPLY to make your queries DRYer

Using the APPLY operator to reduce repetition and make queries DRYer.

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2016-06-10 (first published: 2015-04-02)

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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?