Adding a Computed Column to a Table (2)

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Adding a Computed Column to a Table (2) - SQL School Video

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Andy Warren

Posted Tuesday, June 16, 2009 12:18 PM

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Comments posted to this topic are about the item Adding a Computed Column to a Table (2) - SQL School Video

Andy
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Post #735920

mikelawton

Posted Thursday, June 25, 2009 8:56 AM

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Hi Andy,

I'm curious to whether you'd recommend this approach for a particularly gnarly database I've inherited. It uses a concept of "partial text" for it's keys. For example, 2007-000123-001 might be the key in a table. The first 11 characters is, in essence, the primary key of the parent table in a parent-child hierarchy. The -001 makes it unique in the child table and also gives it a sequential order.

As you can imagine, it's painful because searches invariably rely upon substrings or LIKE clauses. I know that's killing the performance.

My thought was that I could use this computed column approach to slowly migrate us out of this hell, while still maintaining legacy support. I'd be curious to hear your thoughts.

Great work!

-Mike L

Post #741880

Peter Cronin

Posted Thursday, June 25, 2009 12:40 PM

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I was wondering what the performance advantages are between a derived field in a view and computed field in a table. Would you do one over the other because one performs better?

Post #742113

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