It all depends on what the ED::database->execute_query subroutine returns. If it does really return a list of hashes than to print it you can do following: 
for $row (@rows){
    for $key (keys %{$row}){
        print "$key: $row->{$key}\n";
    }
}

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The hash %rows in your code is undefined when you use it so your code does not print enything (if you don't define it somewhere else).

Update Added keys for extracting keys - thanks to edoc.

In reply to Re: help on hashes by zby
in thread help on hashes by Anonymous Monk

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