identify key variable for joining tables

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I have two large tables (562000*2500) imported from a sql database with non-identical headers. I know these tables have 1 or 2 idetical column values which I want to use for joining the two tables. How is it possible to identify the potential key column for joining them?
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Guillaume
Guillaume 2019-5-23
With no a priori knowledge and no way to narrow it down, this sounds like a monumental task, if not impossible. In theory, you'd have to do up to 562000 ^ 3123750 comparisons to find the two columns with the most collisions.
If the two tables come from the same database, is there something in the database schema that could tell you the common column, i.e is there foreign keys?
Geoff Hayes
Geoff Hayes 2019-5-23
Johnny - how do you even know that there are common columns between the two tables? What has led you to believe that?

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