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Select values from a table and compare with other table values

I have the following two tables A B C x1 a1 x1 x2 a1 x5 x3 a1 x7 x5 b1 x3 x6 b1 x6 x7 b1 x7 x8 c1 x1 x9 c1 x7 I want find fields "b1" in table B, then ...