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sql server Foreign Key to a GUID

Posted on 2014-09-12
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I have two tables, tblpeople and tbladdresses.  Both have a PersonID, in tblpeople that id is a Primary Key data type GUID.  In the tbladdresses it is a varchar, but has the same info from tblpeople but there are duplicates due to multiple addresses.  I am trying to get a foreign key reference but it is complaining about the data type issue.  What is the best way to fix this?
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Question by:gwarcher
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Brian Crowe earned 2000 total points
ID: 40320224
I would recommend changing the datatype of the tblAddresses column to UNIQUEIDENTIFIER.  The datatype name "uniqueidentifier" does not mean that the value must be unique within the table.
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by:gwarcher
ID: 40320237
I was not aware of that.  Thank you.  I thought it had to be unique.
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by:Brian Crowe
ID: 40320262
It just means that it s intended to be globally unique so that if you execute NEWID() on multiple machines at the same time and/or the same machine multiple times you are "guaranteed" to get unique values in each case.  Actually this isn't 100% true but it is generally "true enough".
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