Tim Mitchell

Tim Mitchell is a business intelligence consultant, author, and trainer. He has been building data solutions for over 20 years, and is a 13-time recipient of the Microsoft Data Platform MVP award (2010-2022). He is the founder and principal data architect at Tyleris Data Solutions.

Tim has spoken at international and local events including the SQL PASS Summit, SQLBits, SQL Connections, along with dozens of tech fests, code camps, and SQL Saturday events. He is the author of the book The SSIS Catalog: Install, Manage, Secure, and Monitor your Enterprise ETL Infrastructure, coauthor of the book SSIS Design Patterns, and is a contributing author on the charity book project MVP Deep Dives Vol 2.

You can visit his website and blog at TimMitchell.net or follow him on Bluesky at https://bsky.app/profile/tmitch.net.
  • Interests: SQL Server, Data Warehousing, ETL, Data Architecture, Python, Dbt

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Blog Post

Why Before How

I’ve spent a lot of time browsing and participating in online technical forums. In my early years in the industry...

2017-03-28 (first published: )

1,892 reads

Blog Post

Managing Bad Data

In the last post in my ongoing series about ETL best practices, I discussed the importance of error handling in ETL...

2017-02-21 (first published: )

2,208 reads

Blog Post

What is ETL?

In my ongoing series on ETL Best Practices, I am illustrating a collection of extract-transform-load design patterns that have proven...

2017-01-16 (first published: )

2,518 reads

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Blogs

Prep data for AI vs. Fabric Data Agent Instructions: What Goes Where?

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Making Data AI-Ready, Part 3 (This is the final article in a three-part series...

Keeping Track of my ConEmu CLIs

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I use ConEmu for my terminal interface. I’m still on Windows 10 at home,...

10 Decisions to Make Before You Create A Fabric Workspace

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Creating a Fabric workspace takes about 30 seconds. Restructuring workspaces after people have built...

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Question of the Day

Adding new column with DEFAULT II

Which number did the two COUNT(*) return: 

DROP TABLE IF EXISTS #tmp
CREATE TABLE #tmp (id INT NOT NULL)

INSERT INTO #tmp (id) 
SELECT gs.value
  FROM GENERATE_SERIES(1, 5) AS gs

ALTER TABLE #tmp ADD my_value INT NOT NULL CONSTRAINT df_tmp_my_value DEFAULT 1

SELECT COUNT(*)  FROM #tmp AS t WHERE my_value = 1

ALTER TABLE #tmp DROP CONSTRAINT df_tmp_my_value

ALTER TABLE #tmp ADD CONSTRAINT df_tmp_my_value DEFAULT 2 FOR my_value

SELECT COUNT(*)  FROM #tmp AS t WHERE my_value = 1

See possible answers