postgresql and perl?

Hi-
I'm a newbie at postgresql and was working on
sorting by category. What my question is, how do you
sort by category when using a variable. For instance,
you can sort by name in perl by doing:

$sqh = $dbh->prepare(q{select name from company order
by name;});
$sqh->execute();

but what if you have a variable set like:
$sort_selection = name;

How do you sort by the variable?

For instance you cannot do:
$sqh = $dbh->prepare(q{select name from company order
by ?;});
$sqh->execute($sort_selection);

OR

$sqh = $dbh->prepare(q{select name from company order
by $sort_selection;});
$sqh->execute();

If anyone could help, I would greatly appreciate it.

Thanks again!

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