hexid1 hexid2 jaccard
A      A      0
A      B      ab
A      C      ac
B      A      ba
B      B      0
B      C      bc
C      A      ca
C      B      cb
C      C      0

hexid1 hexid2
A      B
A      C
B      A
B      C
C      A
C      B

[field1] & "_" & [field2]