I have a table with columns id, a, and b.
a+b should be unique, but this is a legacy database that is not constrained correctly. How can I get a set of ids for records in which a+b is not unique?
If I have
ID A B
1 2 3
2 2 3
3 1 3
4 1 4
Then I want to get records 1 and 2 back from the query.