Sub query expressions vs. Joins.
Do sub query expressions introduce a performance penalty on retrieving large data sets?
2012-01-20 (first published: 2010-07-22)
28,777 reads
Do sub query expressions introduce a performance penalty on retrieving large data sets?
2012-01-20 (first published: 2010-07-22)
28,777 reads
By Vinay Thakur
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Hi Team, I am trying to refresh the Azure Synapse Dedicated pool from production...
hi everyone I am not sure how to write the query that will produce...
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