Removing Mirrored Pairs from SQL Join

Question

I have a table with 2 fields (name, interest) and I want to find all pairs that have the same interest, with all duplicates and mirrored pairs removed.

I am able to find

Answer 1

Suppose we have table Name with tuples:

 F1  F2           
Jon Smith          
Smith Jon

then to remove this pair we can make query like this:

SELECT n1.F1, n1.F2         
FROM Name n1            
WHERE n1.F1 > (SELECT n2.F1  
                  FROM Name n2  
                  WHERE n1.F1=n2.F2)

So Instead of using <> in

(SELECT * FROM Matches
WHERE name2 **<>** (select name1 from Matches);)

use > or < operator and It should work fine.