2024-12-27
652 reads
T-SQL
Why a Self-Join Requires Halloween Protection
I was asked recently why Halloween Protection was needed for data modification statements that include a self-join of the target table. This gives me a chance to explain, while also covering some interesting product bug history from the SQL Server 7 and 2000 days.
2024-12-18
2024-12-18
1,374 reads
2024-12-16
1,763 reads
2024-12-09
623 reads
2024-12-06
623 reads
Calculate a Moving Average with T-SQL Windowing Functions
Learn how to create a moving average in SQL Server using older and less performant T-SQL and a modern way using windowing functions.
2024-12-06
2024-12-04
642 reads
2024-12-03 (first published: 2024-12-02)
692 reads
SQL IS NULL and SQL IS NOT NULL Examples
This article looks at how to use SQL IS NULL and SQL IS NOT NULL operations in SQL Server along with use cases and working with NULL values.
2024-12-02
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Question of the Day
UNISTR Basics
What does this code return in SQL Server 2025+? (assume the database has an appropriate collation)
SELECT UNISTR('Hello 4E16754C') AS 'A Classic';
A: 
B: 
See possible answers