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Developer-C 11.1
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CREATE TABLE tablename([col1] varchar(2), [col2] varchar(3), [col3] varchar(5)); INSERT INTO tablename([col1], [col2], [col3]) VALUES ('a', 'a1', 'blah'), ('a', 'a1', 'blah2'), ('a', 'aa1', 'blah'), ('a', 'aa1', 'blah3'), ('a1', 'b1', 'blah'), ('b', 'b1', 'blah'), ('b', 'b1', 'blah2'), ('b', 'bb1', 'blah'), ('b', 'bb1', 'blah2'), ('b1', 'c1', 'blah'), ('c', 'c1', 'blah'), ('c', 'c1', 'blah2'), ('c', 'cc1', 'blah'), ('c', 'cc1', 'blah3'), ('c1', 'd1', 'blah');
15 rows affected
select col1, col2 from tablename where len(rtrim(ltrim(coalesce(col1, '')))) > 0 group by col1, col2 having count(*) > 1
col1
col2
a
a1
a
aa1
b
b1
b
bb1
c
c1
c
cc1