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Create a Tally Function (fnTally)

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Many people have published high performance, read-less, Inline Table Valued functions that use Itzik Ben-Gan's wonderful "Virtual Numbers Table" to replace WHILE loops and other forms of RBAR. This one is Jeff Moden's version.

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2019-08-13 (first published: )

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SQLServerCentral Article

A Love Hate Affair with User Defined Types

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Many new DBAs think that User-defined types are a very cool feature in SQL Server when they first encounter them. However many experienced DBAs soon realize that UDTs can be a pain to work with and longtime SQL Server guru David Poole discusses his experiences

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2007-07-23

7,949 reads

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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