select Column1, Column2, count(*) from yourTable group by Column1, Column2 HAVING count(*) > 1
select * from yourTable ou where (select count(*) from yourTable inr where inr.sid = ou.sid) > 1
DELETE FROM sf_table WHERE id IN (SELECT id FROM (SELECT id, ROW_NUMBER() OVER( PARTITION BY tosp, icd ORDER BY id ) AS row_num FROM sf_table ) t WHERE t.row_num > 1 );