Thomas LeBlanc

Thomas LeBlanc is a Business Intelligence Consultant/Data Warehouse Architect in Baton Rouge, Louisiana. He uses his 25+ years in IT to help develop OLTP systems with normalized databases for high-performing T-SQL and end-to-end dimensional data marts using SSIS, SSAS, PPS, and Excel. His SQL Server certifications include MCSA 12, MCITP 08 BI and DBA, MCITP 2005 DBA, and MCDBA 2000. As a PASS volunteer, he is current chair of the Excel BI virtual chapter, past chair of the Data Architecture virtual chapter, and past virtual chapter mentor. He has helped the Baton Rouge SQL Server User Group with SQLSaturdays and speaks at local IT meetings.
  • Interests: #SQLFamily

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Blog Post

Covering Indexes

Microsoft continues to improve indexes and options for additional performance enhancements. One I see frequently is the need for a...

2015-12-03 (first published: )

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Blogs

What DevOps Look Like in Microsoft Fabric

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Microsoft Fabric (not to be confused with the more general term “fabric” in DevOps)...

T-SQL Tuesday #192: What career risks have you taken?

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I’m honored to be hosting T-SQL Tuesday — edition #192. For those who may...

AI: Blog a Day – Day 3: LLM Models – Open Source vs Closed Source

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Continuing from Day 2 , we learned introduction on Generative AI and Agentic AI,...

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Question of the Day

Fun with JSON I

I have some data in a table: 

CREATE TABLE #test_data
(
    id INT PRIMARY KEY,
    name VARCHAR(100),
    birth_date DATE
);

-- Step 2: Insert rows  
INSERT INTO #test_data
VALUES
(1, 'Olivia', '2025-01-05'),
(2, 'Emma', '2025-03-02'),
(3, 'Liam', '2025-11-15'),
(4, 'Noah', '2025-12-22');
If I run this query, how many rows are returned? 
SELECT *
FROM OPENJSON(
     (
         SELECT t.* FROM #test_data AS t FOR JSON PATH
     )
             ) t;

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