data definition language

There is a myth that DDL statements can't be rolled back. This article tests and debunks the myth.

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2019-01-24

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List columns data type and size for every table in a database

This script will list columns data type and size for every table in a database.

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2009-09-15 (first published: 2009-09-02)

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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?