Brad McGehee

Brad M. McGehee is a MCSE+I, MCSD, and MCT (former) with a Bachelors’ degree in Economics and a Masters in Business Administration. Currently the Director of DBA Education for Red Gate Software, Brad is an accomplished Microsoft SQL Server MVP with over 13 years’ SQL Server experience, and over 6 years’ training experience.

Brad is a frequent speaker at SQL PASS, SQL Connections, SQLTeach, SQL Saturdays, TechFests, Code Camps, SQL Server user groups, and other industry seminars, where he shares his 13 years’ cumulative knowledge.

Brad was the founder of the popular community site SQL-Server-Performance.Com, and operated it from 2000 through 2006, where he wrote over one million words on SQL Server topics.

In 2008, Brad attended 16 conferences/user group events, presented 26 sessions, and had 1,402 people attend them.

A well-respected and trusted name in SQL Server literature, Brad is the author or co-author of more than 14 technical books and over 100 published articles. His most recent books include “How to Become an Exceptional DBA,” and “Brad's Sure Guide to SQL Server 2008: The Top Ten New Features for DBAs,” and “Mastering SQL Server Profiler.”

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SQLServerCentral Article

SSC Clinic: Can Implementing "Optimize for Ad Hoc Queries" Boost Performance for the SQLServerCentral.com and Simple-Talk.Com SQL Servers?

With the introduction of the instance-level option “optimize for ad hoc workloads” in SQL Server 2008, DBAs have a tool to deal with a problem known as plan cache pollution, or plan cache bloat. It’s often caused when one-time use ad hoc queries are sent to SQL Server from Object-Relational Mapping (ORM) solutions, such as LINQ, NHibernate, or Entity Framework. The problem can prevent SQL Server from using its available memory optimally, potentially hurting performance.

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2012-06-14

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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?

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