Suresh Raavi is a database professional, with a zest for SQL Server specializing in Administration and performance tuning. Presently, he is a Sr. SQL Server DBA at the Microsoft Products and Services IT SQL team, taking part in various challenging projects, focusing mainly on performance tuning, database development, high availability and database design. He is passionate about database technologies and "data" in general. He has earned the MCITP Database Administrator 2008, and holds a Master of Science degree in Engineering. He provides insights from the field on his blog at http://SqlServerZest.com. His hobbies includes Running and Travelling.
You can follow him on Twitter @SqlServerZest

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Fun with JSON II

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Changing Data Types

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Question of the Day

Fun with JSON II

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 t1.[key] AS row,
       t2.*
FROM OPENJSON(
     (
         SELECT t.* FROM #test_data AS t FOR JSON PATH
     )
             ) t1
    CROSS APPLY OPENJSON(t1.value) t2;

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