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I work with database programming on an almost daily basis. Typically, the format that our development team has taken is to use an Integer value for primary keys. Are there any advantages to using a GUID for this purpose? Are there any differences in storage space for a GUID as opposed to an integer?
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Here's a good article that will give you some humor as well as some insight into these data types:

http://www.sqlteam.com/item.asp?ItemID=4123

Hope it helps.
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