How efficient is a details table?

Posted by Jeffrey Lott on Stack Overflow See other posts from Stack Overflow or by Jeffrey Lott
Published on 2010-03-19T21:13:26Z Indexed on 2010/03/19 22:11 UTC
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sql-server

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tsql

At my job, we have pseudo-standard of creating one table to hold the "standard" information for an entity, and a second table, named like 'TableNameDetails', which holds optional data elements. On average, for every row in the main table will have about 8-10 detail rows in it.

My question is: What kind of performance impacts does this have over adding these details as additional nullable columns on the main table?

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