Outer Join Trouble
Writing outer joins can be more difficult than it appears at first glance. Steve Jones examines this less often used query technique and brings to light a few places where you can lose data.
2006-01-05
18,603 reads
SQL Puzzles
Male, Female and The Other One (NULL)
When programming in T-SQL, the impact of NULL values can be severe in many cases, especially aggregates. New Author Peter Ward brings us a great explanation on how NULLs can impact things like SUM operations.
2005-12-28
11,048 reads
SET ROWCOUNT and TVFs
SQL Server 2000 has table valued functions that are very useful in many ways. However when you try to limit results with the ROWCOUNT setting, you can end up with some strange results. Peter He brings us a comprehensive look at some of the unpredictable results that you can get and how to code around them.
2005-12-21
10,149 reads
Quick Hints for using the RAISERROR Command
SQL Server 2000 error handling isn't the most mature system for dealing with unexpected events. It has been much enhanced in SQL Server 2005, but many people will be using SQL Server 2000 for a long time. RAISERROR is one of those functions that can really aid in troubleshooting, but is often underutilized. David Poole brings us some hints on how this can help you out in your code.
2005-11-23
19,619 reads
Reporting a menu structure using a recursive UDF
Selecting a menu structure from a series of tables is pretty easy. If you bound the number of levels in the menu. However if you have potentially variable numbers of levels. Stephen Lasham brings us a new piece on using recursion to select the data.
2005-10-11
8,823 reads
An Audit Trail Generator
Auditing is becoming more and more important in many SQL Server environments. DBAs are being tasked with setting up, maintaining, and reporting on audit data. Author Leo Peysakhovich brings us one of his solutions to automatically generate an audit trail for your data.
2005-10-10
23,044 reads
All About Transactions - Part 2
Transactions in SQL Server can be very complicated, and are often misunderstood. Don Peterson brings us part 2 of his series on transactions. This part deals with XACT_ABORT, compilation errors and error handling in transactions.
2004-11-24
19,717 reads
An Is Null Gotcha
In T-SQL you should use the IS NULL keywords to test for a null value. But David Poole runs into a strange gotcha in one of his applications where he is testing for a null value. It's an interesting read following Sherlock Poole around on his hunt to find an error.
2004-07-14
11,706 reads
Missing Temp Tables - Follow Up
Two weeks ago Andy challenged the readers of SQLServerCentral.com to figure out a small puzzle. Come see the results for yourself and find out who won some cash!
2001-06-27
4,865 reads
Missing Temp Tables
In part one of a two part article, Andy Warren challenges the readers of SQLServerCentral.com to solve a problem involving ADO and SQL Server. Are you up to the challenge?
2001-06-01
4,243 reads
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Forums
AllocationType as ROW_OVERFLOW_DATA
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Question of the Day
Missing the Jaro Winkler Distance
I upgraded a SQL Server 2019 instance to SQL Server 2025. I wanted to test the fuzzy string search functions. I run this code:
SELECT JARO_WINKLER_DISTANCE('tim', 'tom')
I get this error message:Msg 195, Level 15, State 10, Line 1 'JARO_WINKLER_DISTANCE' is not a recognized built-in function name.What is wrong? See possible answers