SQLServerCentral.com Articles tagged Tally Table

A Simple Formula to Calculate the ISO Week Number

Mon, 08 Apr 2013 06:00:00 UT

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!

Tally OH! An Improved SQL 8K “CSV Splitter” Function

Fri, 28 Dec 2012 07:00:00 UT

The Tally Table has proven to be a simple and elegant method for avoiding many varieties of RBAR. Unfortunately, one of its more common uses, that of a CSV splitter, has a well-known and serious performance problem. MVP Jeff Moden shows us what that problem is and how to correct it. (UPDATED with additional info and attachments on 5/12/2011).

Hierarchies on Steroids #2: A Replacement for Nested Sets Calculations

Thu, 15 Nov 2012 07:00:00 UT

In this sequel to his first "Hierarchies on Steroids" article, SQL Server MVP Jeff Moden shows us how to build a pre-aggregated table that will answer most of the questions that you could ask of a typical hierarchy. Any bets on whether Santa is packin’ a Tally Table in his bag or not?

Hierarchies on Steroids #1: Convert an Adjacency List to Nested Sets

Tue, 13 Nov 2012 07:00:00 UT

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".

Hidden RBAR: Counting with Recursive CTE's

Mon, 08 Aug 2011 06:00:00 UT

"Counting" is essential to many high performance code techniques. SQL Server MVP, Jeff Moden, shows us how to make sure that we're "Counting" and not "Crippling" our trick-code.

Tally OH! An Improved SQL 8K “CSV Splitter” Function

Fri, 28 Dec 2012 07:00:00 UT

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Tally Table Uses - Part II

Tue, 03 Aug 2010 06:00:00 UT

In part II of his series, Stefan Krzywicki shos us another way Tally Tables have helped solve problems - Text Parsing.

Tally Table Uses - Part I

Mon, 02 Aug 2010 06:00:00 UT

In the first part of a series on Tally Tables, Stefan Krzywick shows how a Tally Table has helped out with fiscal year calculations.

Cross Tabs and Pivots, Part 2 - Dynamic Cross Tabs

Fri, 30 Apr 2010 06:00:00 UT

In Part 1, we learned how to make both Cross-Tabs and Pivots. In Part 2, we'll learn how to automate a very common type of Cross-Tab report and maybe learn some extra tricks on the way.

Tally Table - Character Date Validation

Thu, 17 Dec 2009 07:00:00 UT

Tally (or numbers) tables are one of my favorite query writing tools. Such a simple premise that can be applied...

‘Disturbing Development’
Grant Fritchey & the DBA Team present the latest installment of the Top 5 hard-earned lessons of a DBA – read it now

The Dynamic Tally or Numbers Table

Tue, 22 Sep 2009 06:00:00 UT

Building a tally table is a common T-SQL problem that many new developers struggle with. Lynn Pettis brings us an article that shows how to use CTEs to accomplish this.

Cross Tabs and Pivots, Part 2 - Dynamic Cross Tabs

Fri, 30 Apr 2010 06:00:00 UT

In Part 1, we learned how to make both Cross-Tabs and Pivots. In Part 2, we'll learn how to automate a very common type of Cross-Tab report and maybe learn some extra tricks on the way.