gistfile1.js

var async = require('async');
mysqlConnection.query(queryString, function selectCb(error, results, fields) {
  var subQueryFns = [];
  for (i=0; results.length; i++) {
    subQueryFns.push(function (cb) {
      mysqlConnection.query(deeperQueryString, function selectCb (error, results, fields) {
        cb(error, results);
      }
    });
  }
  async.parallel(subQueryFns, function (error, results) {
    console.log(results); // this will contain an array of the results from each subquery's cb call
    callback(null, results);
  })
}