加入兩個內聯表 - 未知列？

Question

我收到「錯誤代碼：1054.未知列'E1.extensao'in'field list'」。我改變了表名，但我的查詢如下：

SELECT E1.stateName, E1.city, E1.boughtEnough, E2.bought 
FROM 
    (SELECT count(DISTINCT idClient),city,stateName FROM 
     (SELECT 
      max(n.ordervalue) as boughtEnough, 
      m.idClient, 
      i.nome AS city, 
      i.id AS cityId, 
      i.stateName 
     FROM Clients c 
     INNER JOIN client_order m ON c.idClient = m.idClient 
     INNER JOIN orders n ON m.client_order = n.client_order 
     INNER JOIN orderDetail p ON n.idorder = p.idorder 
           AND p.idCurso = m.idCurso 
     INNER JOIN cities i ON c.city = i.id 

     WHERE 
      m.idCurso = '10' 
     GROUP BY 
      m.idClient, 
      i.nome, 
      i.id, 
      i.stateName 
     HAVING max(n.orders) >= 6) t 
    GROUP BY t.city, t.stateName 
    ORDER BY t.stateName,t.city) E1 
JOIN (SELECT count(DISTINCT idClient),city,stateName FROM 
     (SELECT 
      count(n.ordervalue) as bought, 
      m.idClient, 
      i.nome AS city, 
      i.id AS cityId, 
      i.stateName 
     FROM Clients c 
     INNER JOIN client_order m ON c.idClient = m.idClient 
     INNER JOIN orders n ON m.client_order = n.client_order 
     INNER JOIN orderDetail p ON n.idorder = p.idorder 
           AND p.idCurso = m.idCurso 
     INNER JOIN cities i ON c.city = i.id 

     WHERE 
      m.idCurso = '10' 
     GROUP BY 
      m.idClient, 
      i.nome, 
      i.id, 
      i.stateName 
     HAVING ((max(n.orders) < 6) AND (count(n.orders) >= 1))) t 
    GROUP BY t.city, t.stateName 
    ORDER BY t.stateName,t.city) E2 ON E1.cityId = E2.cityId 

我更習慣於SQL Server，而不是MySQL。我錯了什麼？

Answer 1

我認爲E1.extensao意味着E1.boughtEnough？在E1是如何定義仔細一看：

(SELECT count(DISTINCT idClient),city,stateName FROM 
     (SELECT 
      max(n.ordervalue) as boughtEnough, 
     ...) t 
    ...) E1 

有一個t.boughtEnough，但你沒有「傳遞了」以E1。