Andy Warren

I started my SQL journey here at SQLServerCentral as one of the founders, helping to build a place to share and learn that continues to thrive under the editorial guidance of my friend Steve Jones. I've done a lot of volunteer work over the years ranging from our local SQL group (oPASS, SQLOrlando) to serving on the Board of Directors of PASS to designing and building the framework of SQLSaturday (which has gone on to produce more than 1000 locally managed events since we started in 2007). These days I manage a DBA team, but over the years I've been a trainer, consultant, contractor, and DBA. I'm rarely present on social media, the best way to contact me is here, LinkedIn, or via email.

SQLServerCentral Article

Is all code really code? One question from an interview

Andy discusses one of the questions he uses to screen senior developer candidates. While the question itself is interesting, we think it will be more interesting to see how many of you agree with one of his positions - that developers think of program code and sql code as different animals, especially when it comes to debugging.

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2004-07-09

11,918 reads

SQLServerCentral Article

Mini Disaster - AC Failure

Are you prepared to handle a full or partial failure of your AC system? Ever thought about what would happen if it did happen. Once again Andy offers comments on a real world incident. While we'd all like to think it will never happen to us, we think sharing these incidents is a great way to prevent it from happening to others.

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2004-06-07

6,158 reads

SQLServerCentral Article

Case Sensitivity in Selects - Part 1

Your SQL Server has a case insensitive collation, but you need a case sensitive join? Do you know what happens? There are a couple options but do you know the performance implications of using each? Or a way to mitigate the performance degradation that can result?

(1)

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2004-06-03

10,111 reads

SQLServerCentral Article

Replication Gotcha - Columns with Defaults

Some days the simplest things go wrong. On this particular day Andy tried to remove a column that was part of an article in a transactional publication, wound up in an inconsistent state that required a snapshot to fix. Deeper investigation reveals the cause and a work around.

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2004-05-25

7,549 reads

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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;

See possible answers