gistfile1.js

function getName(callback) {
   client.select('name from people', function(err, result) {
     if (err) {
        callback(err);
        return;
     } else {
       // process result
     }
   });
}

// VERSUS

function getName() {
   err, result = client.select('name FROM people');
   if err:
     return err, false;
   else:
     return null, result;
}