If you're trying to do a SQL insert based on a hash, SQL::Abstract may work for you.
use SQL::Abstract;
my $abstractor = SQL::Abstract->new();
my %value_of = ( name => 'Martin', age => 28 );
my ($stmt,@bind) = $abstractor->insert( 'table', \%value_of );
$dbh->do( $stmt, undef, @bind );
If you want to make a hash with keys and not values, that doesn't make sense, as fullermd says. You can, however, easily get a hash with all values set to undef like so:
my %h;
@h{@keys_wanted} = ();
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