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Records: 6  Duplicates: 0  Warnings: 0
person_id name
1 tom
2 dick
3 harry
4 susan
5 mary
6 jill
Records: 8  Duplicates: 0  Warnings: 0
friend1 friend2
2 1
1 2
3 2
2 3
4 3
3 4
6 5
5 6
person_id name person_id name
1 tom 2 dick
1 tom 3 harry
1 tom 4 susan
2 dick 1 tom
2 dick 3 harry
2 dick 4 susan
3 harry 1 tom
3 harry 2 dick
3 harry 4 susan
4 susan 1 tom
4 susan 2 dick
4 susan 3 harry
5 mary 6 jill
6 jill 5 mary