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Předminulou středu jsme opět poobědvali a zároveň si nasdíleli řadu novinek ze světa dat. Tak doufám, že příště dorazíte i vy! Můžete klidně i jen poslouchat, pokud vás novinky...

2022-01-25

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Why Is “WHERE 1=0” Slow?

I saw a question the other day, questioning why they’re creation of temporary tables was so slow. What they were doing was (a much more complicated version of) this:...

2022-01-24 (first published: )

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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