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SQL - compare tables and create another tables that are different

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Last Modified: 2012-08-18
I would like to compare two tables A and B  with the identical schema.  
I try to compare if anything change and produce a table with the changes.

I use a query to query multiple tables and insert all the results into Table A for Day 1
I use the same query to query multiple tables and insert all the results into Table B on Day  2.
Then I would like to see what has changed in Table A by comparing with Table B and I would like to save the result into another Table same schema as Table A and Table B.

How do I do that?
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