Jeff's SQL Server Blog

Random Thoughts & Cartesian Products with Microsoft SQL Server
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Welcome to my weblog. My name is Jeff Smith, I am software developer in Boston, MA and I was recently named a 2009 SQL Server MVP. Check in frequently for tips, tricks, commentary and ideas on SQL Server and .NET programming.


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September 2005 Blog Posts

The power of the Cross Join

Many SQL books recommend that you “avoid cross joins” or “beware of Cartesian products” when writing your SELECT statements, which occur when you don't express joins between your tables. It’s true that you need to ensure that your join conditions are adequately stated so that you don’t accidentally produce this effect, but it is not true that you should avoid these types of joins in every situation.

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posted @ Monday, September 12, 2005 9:20 AM | Feedback (26) | Filed Under [ T-SQL Techniques Joins/Relations ]

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