Group Islands of Contiguous Dates (SQL Spackle)
Fill in another bit of your T-SQL knowledge by learning how to quickly group ranges of contiguous dates without RBAR.
2019-04-19 (first published: 2010-12-07)
26,338 reads
Jeff Moden
- Interests: SQL. When Im not having fun with that, then SQL. ;-)
Sorting Months By Number (SQL Spackle)
Fill in another bit of your T-SQL knowledge by learning how to sort a result set by the proper month order, but use the month name instead.
2019-04-12 (first published: 2010-11-15)
24,057 reads
What's in your CLR?
For today's Friday poll we have a guest editorial from Jeff Moden. The head of the anti-RBAR alliance has spent a lot of time trying to help others write better T-SQL and solve their problems with code that performs well. However this Friday Jeff asks about the CLR and how you are using it, or not using it, in the real world.
2017-08-11 (first published: 2009-12-11)
713 reads
A Simple Formula to Calculate the ISO Week Number
He admits it wasn't his idea but his head sure wishes it was. SQL Server MVP Jeff Moden explains a wonderful, super simple, very high performance formula that will calculate ISO Week Numbers. If you're "stuck" with SQL Server 2005 or less, you're going to like this a whole lot!
2015-10-23 (first published: 2013-04-08)
33,146 reads
Calculating Duration Using DATETIME Start and End Dates (SQL Spackle)
It's an old problem with a solution that's nearly as old. SQL Server MVP Jeff Moden shows us the old trick mixed with a slick trick to format the duration as extended hours, minutes, seconds, and milliseconds.
2015-04-03 (first published: 2014-01-16)
54,909 reads
Hierarchies on Steroids #1: Convert an Adjacency List to Nested Sets
SQL Server MVP Jeff Moden shows us a new very high performance method to convert an "Adjacency List" to “Nested Sets” on a million node hierarchy in less than a minute and 100,000 nodes in just seconds. Not surprisingly, the "steroids" come in a bottle labeled "Tally Table".
2014-09-19 (first published: 2012-11-13)
35,536 reads
How to Make Scalar UDFs Run Faster (SQL Spackle)
It's a well known fact that Scalar UDFs are the stuff of performance nightmares in T-SQL. But are they really as bad as they say? SQL Server MVP Jeff Moden shows us that they might not really be as big a problem as you might think and what you can do when they actually are.
2014-06-24 (first published: 2012-08-01)
25,287 reads
Find Customers Who Bought "A" and "B" But Not "C" (SQL Spackle)
A simple problem that can become complex in T-SQL. How do you find the rows that match 2 conditions, but not a third, in an efficient manner. MVP Jeff Moden gives us a solution.
2014-06-06 (first published: 2012-03-29)
39,508 reads
Finding “Active” Rows for the Previous Month (SQL Spackle)
SQL Server MVP Jeff Moden walks us through the classic problem of finding all the "Active" rows for the previous month using start and end dates. This is excellent for those new to T-SQL.
2014-01-30
8,008 reads
Skipping Columns (& other tricks) Using BCP Format Files (SQL Spackle)
BULK INSERT and BCP are powerful, high performance tools for importing text files. SQL Server MVP Jeff Moden gives us several nifty tips in this introduction to BULK INSERT and BCP Format Files including "Skipping Columns" and the sequestration of bad rows while still loading all the good data.
2014-01-23
19,262 reads
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