High Performance Relational Division in SQL Server
Relational division is used in SQL to select rows that conform to a number of different criteria. Dwain Camps explains how to use it, and shows the performance gains.
2014-04-04
3,369 reads
Relational division is used in SQL to select rows that conform to a number of different criteria. Dwain Camps explains how to use it, and shows the performance gains.
2014-04-04
3,369 reads
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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