$hash{ column_name1 }{ value1 } = value2;
$hash{ column_name2 }{ value2 } = value1;

##</code><code>##

$hash{ DATA }{ table1 }{ column_name1 }{ value1 } = value2;
$hash{ DATA }{ table1 }{ column_name2 }{ value2 } = value1;