Select Code to Download

        use Fcntl;   # For O_RDWR, O_CREAT, etc.
        use SDBM_File;
...
        ...

        untie %h;

        $h{user} = "bob";

        $h{prefs} = { color => 'red', font => 'large' };

server:  foo
database: stuff
...
|bob|blue|large|
|mary|blue|tiny|

  SELECT name FROM prefs WHERE font = 'tiny';
|name|
...
|bob|blue|M|
|mary|blue|F|

  $result => [
    {
...
      sex => 'F'
    }
];