Your error is because @data is an array of ARRAY references not HASH references. Try

my %homes_by_names=();
my @data=();
foreach my $rdata ( @{ $sqldata } ) {
  ++$homes_by_names{  $rdata->{'NAME'} };  
  push @data,$rdata;
}

foreach my $row ( @data ) {
  $row->{'HOME_COUNT'} = $homes_by_names{ $row->{ NAME } };
}
print Dumper \@data;

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poj

In reply to Re^7: Adding an element to an array by poj
in thread Adding an element to an array by Anonymous Monk

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