An Informal Look at Database Performance
A review on the basic steps to correct a poorly performing query
2010-09-08
12,480 reads
Timothy A Wiseman
- Interests: SQL Server, Python, Go, Mathematics, Legal Issues
Going From Many Schemas To One Schema
A Technique to deal with moving data from multiple schemas into one table
2010-08-09
6,401 reads
Undocumented Extended and Stored Procedures
Some useful undocumented extended and stored procedures in SQL Server 2005
2009-11-20 (first published: 2008-05-09)
33,452 reads
2009-01-17 (first published: 2008-05-28)
4,234 reads
2008-12-02
9,122 reads
2008-10-23 (first published: 2008-08-24)
1,915 reads
2008-09-09
12,787 reads
CTEs in Report Creation
A discussion on using CTEs to speed the development and maintenance of reports and enhance readability.
2008-03-31
6,159 reads
Reading Ad Hoc Text Files with OpenDataSource
Discusses the techniques and reasons to use opendatasource for reading text files in SQL Server 2005.
2007-12-13
10,376 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