public ArrayList<String> select(String[] columnsArray, String table){
        ArrayList<String> data = new ArrayList<String>();

        String columnsString = String.join(", ", columnsArray);
        String sql = "SELECT w.FirstName, w.LastName, w.Title, w.City, w.Country, m.FirstName as RepName FROM Employees w LEFT JOIN Employees m ON m.EmployeeId = w.ReportsTo";

        System.out.println(sql);
        try{
            stmt = conn.createStatement();
            rs = stmt.executeQuery(sql);
            while(rs.next()){
                data.add(rs.getString("FirstName") + "---" +
                        rs.getString("LastName") + "---" +
                        rs.getString("Title") + "---" +
                        rs.getString("City") + "---" +
                        rs.getString("Country") + "---" +
                        rs.getString("RepName"));
            }
        } catch (SQLException e) {
            System.out.println(e.getMessage());
        }
        return data;
    }