// dependencies
var mysql =  require("mysql");
// db connection settings
var con = mysql.createConnection({
	host:"localhost",
	user:"root",
	password:"xxxxxx",
	database:"xxxx"
});

// connect to the database

con.connect(function(err){
	if(err)
		console.log(err)
	else
		var sql = "SELECT * FROM employee WHERE emp_id = 4";
		con.query(sql, function(err, data){
			if(err){
				console.log(err)
			}
			else{
				console.log(data.sex);
			}
		});
});

 here is the query result

 [ RowDataPacket {
    emp_id: 4,
    first_name: 'Micheal',
    last_name: 'Scott',
    birth_date: 1964-06-04T07:00:00.000Z,
    sex: 'M',
    salary: 75000,
    super_id: 2,
    branch_id: null } ]