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The SQL of Gaps and Islands in Sequences

Some SQL problems are intriguing because, just when good methods emerge and are accepted, other alternative solutions are discovered. The fun of exploring problems such as 'Gaps and Islands' is all the greater when we have a thorough test-harness to try out the alternative solutions.

2013-08-13

2,738 reads

Technical Article

SQLServerCentral.com Users Survey 2013

We want to make sure we're covering the things that are relevant to you, so we're asking for some feedback on what you use on SSC, where we need to improve, and what you'd like to see.

It should only take a few minutes, and three randomly-selected people will win a $100 Amazon gift card for their efforts.

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2013-08-08 (first published: )

4,695 reads

External Article

The Big Data DBA

Many IT enterprises are starting pilot projects to implement big data solutions. This article highlights what you need to know to check if you're ready to support these efforts, and integrate them into your current architecture, processes, and standards.

2013-08-02

3,540 reads

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VS Code, Unresolved References.

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Hi all, I just started using VS Code to work with DB projects.  I...

Fun with JSON II

By Steve Jones - SSC Editor

Comments posted to this topic are about the item Fun with JSON II

Changing Data Types

By Steve Jones - SSC Editor

Comments posted to this topic are about the item 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;

See possible answers