Gordon Pollokoff

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SQLServerCentral Article

A Case Study in Performance Tuning

SQL Server does a wonderful job of tuning itself, selecting the optimum query plans and in general performing very well under a variety of conditions. That does not mean the a good DBA cannot add value by setting up the system and ensuring the optimizer receives the information that it needs. New author Gordon Pollokoff brings us a short case study from a project he as recently involved in where a new application required a bit of tuning.

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2005-01-24

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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