TSQL Challenge 33 - Calculate list of bookings fully paid on the book
This problem is related to a reservation system where customers book a service and pay it in one or more transactions which may happen on different dates.
2010-06-28
1,598 reads
Articles
Operator of the Week - Lazy Spool
Continuing to illuminate the depths of SQL Server's Query Optimizer, Fabiano shines a light on the sixth major Showplan Operator on his list: the Lazy Spool. What does the Lazy Spool do that's so special, how does the Query Optimizer use it, and why is it so Lazy? Fabiano Amorim explains all.
2010-06-28
2,774 reads
SSAS: Explaining the State Transitions Viewer for Sequence Clustering
In SQL Server 2005 and SQL Server 2008, Microsoft has added some fantastic visualizations around data-mining algorithms. These visual aids allow us to see exactly what a particular algorithm is predicting or describing—making a difficult subject easier to understand.
2010-06-25
2,023 reads
Concurrent processing in SSIS – Part 2
The second part of a series that looks at two additional techniques for processing data in parallel in Integration Services.
2010-06-24
6,725 reads
I’m a SQL Server DBA, and I’m in Love with PowerShell
To learn PowerShell, Laerte Junior suggests that you just start using it. To encourage you to start, he provides a series of tips on using PowerShell with SQL Server to solve various everyday problems. With a little patience, a good IDE, and a bit of help and advice, "the lion is dead".
2010-06-24
5,883 reads
2010-06-23 (first published: 2008-12-24)
37,410 reads
Late June 2010 PASS VC Presentations
PASS BI and DBA Virtual Chapters have free training available on Wednesday June 23rd.
2010-06-23
477 reads
Using the UPTIME Utility to Monitor Servers
Learn how to use a free utility to quickly monitor the uptime of your SQL Server instances.
2010-06-23
8,395 reads
Voting opens for Exceptional DBA of 2010
The voting for the 2010 Exceptional DBA opens today, and you can read about the finalists and prizes inside.
2010-06-23
669 reads
Making your SQL Server database changes backward compatible: Adding a new column
As multi-tier architectures grow over time, it is often challenging to coordinate those changes across the data, logic and presentation tiers. Unless planned and implemented carefully, an act as simple as adding a column to a table can grind all of the components of your application to a halt. While some of us have comfortable 12-hour maintenance windows every weekend, many of us are bound by service level agreements that are much more strict. So we must find ways to introduce fixes and new features with zero downtime, and without requiring every single component to be refactored at the same time.
2010-06-23
3,366 reads
Blogs
RANK() vs DENSE_RANK(): #SQLNewBlogger
By Steve Jones
I haven’t done one of these in awhile, but I saw an article recently...
Using CAT for Testing of Data Agents
In last months one of the scenarios where you can use AI has been...
Forums
Missing the Jaro Winkler Distance
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Doing Good at SQL Server Central
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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