mysql - 複数のテーブルを持つ複雑なSQLクエリ

Question

私は3つのテーブルを持っています：

お客様

ID_CUSTOMER
NAME

製品

ID_PRODUCT
PRODUCTNAME
PRICE

注文

ID_ORDER
CUSTOMER_ID
PRODUCT_ID
QUANTITY

10,000ドル以上で注文したすべての顧客を選択するにはどうすればよいですか？

Answer 1

select c.*
from customers c
inner join orders o on o.customer_id = c.id_customer
inner join products p on p.id_product = o.product_id
group by c.id_customer
having sum(p.price * o.quantity) >= 10000

Answer 2

これを試して：

 SELECT   a.ID_CUSTOMER, 
          a.NAME
   FROM   CUSTOMERS a
            INNER JOIN ORDERS b 
              ON b.CUSTOMER_ID = a.ID_CUSTOMER
            INNER JOIN PRODUCTS c
              ON c.ID_PRODUCT = b.product_id
GROUP BY  a.ID_CUSTOMER, a.NAME
  HAVING  SUM(c.PRICE * b.QUANTITY) >= 10000

Answer 3

次のようなものを試してください：

SELECT C.ID_CUSTOMER, C.Name, 
      SUM(P.PRICE * O.QUANTITY) AS Total FROM Customers C 
      JOIN Orders O ON C.CUSTOMER_ID = O.CUSTOMER_ID
      JOIN Procucts P ON P.PRODUCT_ID = O.PRODUCT_ID
      GROUP BY C.ID_CUSTOMER, C.Name
      HAVING SUM(P.PRICE * O.QUANTITY) >= 10000

Answer 4

実際には複雑なクエリではありません。同じことを行う別の構文:

SELECT C.ID_CUSTOMER, C.NAME, SUM(P.PRICE * O.QUANTITY) TOTAL
  FROM Products P, Customers C, Orders O
 WHERE O.CUSTOMER_ID = C.ID_CUSTOMER 
   AND O.PRODUCT_ID = P.ID_PRODUCT
 GROUP BY C.ID_CUSTOMER, C.NAME
HAVING SUM(P.PRICE * O.QUANTITY) >= 10000