2 JOINS MYSQL和LIMIT 1

Question

我有3个表，并希望做出正确的查看他们的SQL查询。

1）Zakaz

id | Comment 

2.）托瓦尔

id | id_clients | zakaz 

3.）用户

id | name 

它们连接为：

zakaz.id = tovar.zakaz 
tovar.id_clients = users.id 

我希望看到

zakaz.id | users.name 

但我想只限制每zakaz 1串，所以我所做的：

SELECT zakaz.id, zakaz.comment, tovar.id_clients 
    FROM zakaz 
    JOIN tovar ON zakaz.id = tovar.zakaz 
GROUP BY zakaz.id 

，然后我想加入的用户，但它不工作

SELECT zakaz.id, zakaz.comment, tovar.id_clients, users.name 
    FROM zakaz 
    JOIN tovar ON zakaz.id = tovar.zakaz 
    GROUP BY zakaz.id 
JOIN users ON users.id = tovar.id_clients 

Answer 1

它会显示最新的ID Zakaz

SELECT a.name, c.id 
FROM Users a 
      INNER JOIN 
      (
       SELECT id_clients, zakaz, MAX(id) maxID 
       FROM Tovar 
       GROUP BY id_clients, zakaz 
      ) d 
       ON d.id_clients = a.id 
      INNER JOIN Zakaz c 
       ON d.zakaz = c.id