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Select distinct('more than one column') from ....

user128148Apr 22 2002 — edited Dec 2 2009
Why does this sql statement not work:
select distinct(column_a, column_b, column_c), empno
from emp;

How can I 'select distinct' using more than one column.
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Locked on Dec 30 2009
Added on Apr 22 2002
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