Hidden RBAR: Triangular Joins

Friday Jan 16th 2009 by DatabaseJournal.com Staff
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Just because it looks set based, doesn't mean it is. T-SQL Crackerjack Jeff Moden takes a look at a mistake that many query writers make.

[From SQL Server Central]

If you've been around the forums on SQLServerCentral.com, you've probably seen me use the term "RBAR". "RBAR" is pronounced "ree-bar" and is a "Modernism" for "Row-By-Agonizing-Row". I use the term "RBAR" for anything that isn't set based. Some others have picked up on it because it's easy to remember as a form of "Death By SQL".

Many folks think that "set-based" programming means one of two things...

  1. It's all done in a single query or...
  2. It simply doesn't have a Cursor or a While Loop

Both of those are very bad misconceptions as to what set based programming is.

The article continues at http://www.sqlservercentral.com/articles/T-SQL/61539/

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