I was wondering what really is a Key lookup in a database ?
And what are the differences between Key Lookup and Business Rules?
Thank you guys !
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I was wondering what really is a Key lookup in a database ?
And what are the differences between Key Lookup and Business Rules?
Thank you guys !
A key lookup is an operator used in a query plan and as a general rule points to a lack of a covering index
http://technet.microsoft.com/en-us/library/bb326635.aspx
I’m not sure about what context you are using business rules in, maybe some kind of check constraint?