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  1. or download this
       my $sth = $dbh->prepare("SELECT foo, bar, baz FROM bif");
  2. or download this
       my @cols = qw(foo bar baz);
   my $sth = $dbh->prepare("SELECT " . join(', ', @cols) . " FROM bif"
+);
  3. or download this
       foreach $field (@cols) {