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+----+----------+----------+-------+-----------------+
| id | nickname | password | socks | favorite_number |
...
|  1 | Cowlick  | salty    |     0 |               4 |
|  2 | andy     | bandy    |     3 |               7 |
+----+----------+----------+-------+-----------------+

#!/usr/bin/perl -w
use warnings;
...
}

$dbh->disconnect();

my $sth = $dbh->prepare( qq/select * from users/);

my $sth = $dbh->prepare( qq/select id, password from users where nickn
+ame = '$input_nickname'/);