hash slices

I'm using DBI's selectall_hashref with 5 key columns. I want to display
each row where key col 1 is 'yes' or NULL (undef or '' ?)


foreach my $medCategory (keys
%{$href->{'yes'}->{qw('' 'yes')}->{qw('' 'yes')}}) {
foreach my $med (keys
%{$href->{qw('yes')}->{qw('' 'yes')}->{qw('' 'yes')}->{$medCategory}}) {
foreach my $ID (keys
%{$href->{qw('yes')}->{qw('' 'yes')}->{qw(''
'yes')}->{$medCategory}->{$med}}) {


print qq{ $href->{qw('yes')}->{qw(''
'yes')}->{qw('' 'yes')}->{$medCategory}->{$med}->{$ID}->{ID} };
print qq{ $href->{qw('yes')}->{qw(''
'yes')}->{qw('' 'yes')}->{$medCategory}->{$med}->{$ID}->{Medication} };
}
}
}

This isn't working of course because I don't quite understand the syntax I
need. Can someone give me a hint? Thanks!

Ryan

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