How To Know if this Data Table column is Exist to Other Data able

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1

Hi team I have two Build data table

First data table

Column1 | Column2
A       | A
A       | B
B       | A
C       | D

Second Data table

Column1 | Column2
A       | F
A       | D
A       | A
A       | D

What is the Best approach to Know
that this row and Column A | A is exists in Second Data Table
and A | B is exists in Second Data Table as so on.