Dennis Cheung is a Senior DBA currently living in Hong Kong, he has been working with SQL server since 2000. He has supported a different version of SQL and loves to learn new technology.

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SQL Licensing

Recently, there are lots of questions about SQL licenses, many of them came from the fact that they starting to upgrade to 2012/2014 from their old 2005 servers as...

2015-09-30

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Fun with JSON II

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Changing Data Types

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Answering Questions On Dropped Columns

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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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