连接具有相同字段名称的2个表

Question

I have 2 tables :

authors
+-----------+--------------+------+-----+
| Field     | Type         | Null | Key |
+-----------+--------------+------+-----+
| id        | int(6)       | NO   | PRI | 
| name      | varchar(255) | NO   |     |
| age       | varchar(255) | NO   |     |
+-----------+--------------+------+-----+

books
+-----------+--------------+------+-----+
| Field     | Type         | Null | Key |
+-----------+--------------+------+-----+
| id        | int(6)       | NO   | PRI | 
| name      | varchar(255) | NO   |     |
| pub_date  | datetime     | NO   |     |
| author_id | int(11)      | YES  | MUL | 
+-----------+--------------+------+-----+

I'd like to get the author information with his last written book information. Something that would look like that :

{
  name:"Tolkien",
  age:null,
  last_book:{
    name:"The Children of Hurin",
    pub_date:"2007"
  }
}

For now I am doing it that way :

Select Aut.name, Aut.age, Book.name AS Book_name, Book.pub_date 
FROM authors AS Aut 
LEFT JOIN books AS Book ON (Aut.id=Book.author_id) 
WHERE Aut.name="Tolkien" 
ORDER BY Book.pub_date DESC 
LIMIT 1 

This means that I have to process the result and then order it to have the json that I showed previously.

Answer 1

Only way is post-processing, but is not so much if you use json_encode for serializing an object:

$res = mysqli_query("SELECT ...");
$obj = new stdClass();
if($row = mysqli_fetch_object($res)) {
    $obj->name=$row->name;
    $obj->age=$row->age;
    $book = new stdClass();
    $book->name = $row->Book_name;
    $book->pub_date = $row->pub_date;
    $obj->last_book = $book;
}

print json_encode($obj);