Christian lives in Guatemala. He has worked with Databases for about 12 years, at the beginning as a software developer and for the last 10 years as DBA. His expertise areas are Database migration, Performance tuning, Security of SQL Server and Designing and Implementing HA and DR environments. He has worked with SQL Server since version 2000. Passionate about SQL Server, Azure and joining to the Online SQL Server community. You can always find him on Twitter (@charaujo).

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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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