(["a","b","c"]
["a","b","d"])
##</code><code>##

a
b
c,d
##</code><code>##

a
b
b

a
b
d
##</code><code>##

my arr_ref= $sth->fetchall_arrayref();
foreach my $row(@$arr_ref) {
   #missing something here
    my ($ele1,$ele2,$ele3)= @$row;
    print "$ele1\t",
    print "$ele2\t",
    print "$ele3\n",
}