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How to select duplicate columns data from table

If I understand correctly:

select col1, col2, col3, col4
from table t
where exists (select 1 from table t2 where t2.col1
= t.col1 and t2.col1 <> t.col1) and
      exists (select 1 from table t2 where t2.col2
= t.col2 and t2.col1 <> t.col1) and
      exists (select 1 from table t2 where t2.col3
= t.col3 and t2.col1 <> t.col1);

Categories : SQL

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