char

Sherlee Dizon looks at the basic differences between char, nchar, varchar, and nvarchar, as well as what to be aware of when using each data type.

2016-07-21

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Generate script to change column length of string datatypes in a DB

This script can be used to generate alter column length of any string data type column(s) in a database.

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2011-12-27 (first published: 2011-11-22)

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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?