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Can I join these two tables?

Posted on 2013-05-15
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Last Modified: 2013-05-15
I want to join two tables. TableA to TableB.

TableA has a Primary Key but TableB has no foreign key.

They both have a column named Type1_ID.  And Type1_ID is not a primary or foreign key in either table.

Is there a best practice approach in this type of situation?
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Question by:rhservan
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Expert Comment

by:STHOMP02169
ID: 39168801
Joining on a primary or foreign key isn't required. You do want to make your join unique though. Can you provide a little more infromation on the nature of the two tables? Do both contain attributes of a specific fact? or does TableB define Type1_ID?
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by:rhservan
ID: 39168830
Yes on the attributes.  

Type1_ID column in TableA & TableB are define the same.
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Patrick Matthews earned 500 total points
ID: 39168837
To join tables, you need some way of specifying the relationship between the two.  That is, you have to have some way of identifying which row(s) on TableB correspond to a given row on TableA, and vice versa.

So, if the relationship is based on having the same values in the Type1_ID columns, then yes, joining on that is perfectly fine.
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