Well done. Some corrections if I may.
(a) bind_columns SHOULD be after execute has been called. As DBI's manual says, that's for maximum compatibility.
(b) You call bind_columns with four parameters (the first one been undef) while your execute only returns three (id, name and phone). While I have never used bind_columns before execute, I beleive that should fail.

My way is similar but not the same (I include just the different part):

my $sth = $dbh->prepare_cached(<<SQL);
select id, name, phone from people
where birth_month = ?
SQL

for my $month (@months) {
  print "People born in $month:\n";

  my($id, $name, $phone);
 
  # Execute the statement for this $month
  $sth->execute($month);
  $sth->bind_columns(\$id, \$name, \$phone);
  # Also valid:  $sth->bind_columns(\($id, $name, $phone));
  # Fetch each row and print out the values
  while ($sth->fetch) {
     print "\t", join("\t", $id, $name, $phone), "\n";
  }
}
[download]

---

---

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		&
	<		&lt;
	>		&gt;
	[		&#91;
	]		&#93;

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.