The Hidden Danger of Wildcard Operators In Join Operations
This article looks at one of the killers of performance at scale, SELECT *.
2026-08-14
2,225 reads
JOIN
2024-11-13
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2023-08-04
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Learn about SQL Joins on Multiple Columns
Learn about joining SQL Server tables together for a query when there is a need to join on multiple columns.
2021-12-27
Join SQL Server tables where columns include NULL values
Dealing with NULL values especially when joining tables can become a challenge. Let's take a look at this issue and how this can be resolved.
2021-09-01
Join Two CSV Files with a Common Column
In this example we will join two CSV files with a common column using SQL Server.
2017-01-23
7,476 reads
SQL Server JOIN Hints
You, as a SQL Server data professional, are looking for ways to improve your queries. You've done the usual - avoided cursors and loops, used locks effectively, examined execution plans - what else can you tweak? Check out this tip to learn more.
2013-04-08
6,542 reads
2012-02-20
2,419 reads
2009-12-07 (first published: 2009-11-12)
3,094 reads
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Question of the Day
RegEx Functions II
I have this data in a table in a SQL Server 2025 database:
EmailAddressID EmailAddress 7 dylan0@ADVENTURE-WORKS.COM 8 Diane1@ADVENTURE-WORKS.COMIf I run this query, which row(s) are returned?
SELECT top 10 * FROM person.EmailAddress WHERE REGEXP_LIKE(EmailAddress, '^d') AND BusinessEntityID IN (7,8)See possible answers