html - 合并数据库表并形成一张表

Question

我有两个表，一个是 Customer Detail，另一个是 Order Detail。每次客户订购东西时，它都会将其存储在数据库中。如何找到哪些客户订单以及他们的订单次数，以及如何结合客户名称和订单？

CUSTOMER DETAIL:

ID  NAME        AGE COUNTRY
1   AAA     22  US
2   BBB     26  UK
3   CCC     25  TN


ORDER DETAIL:

ID  ITEMS   PRICE QUANTITY
1   APPLE   5
1   ORANGE  6
1   MANGO   4

客户AAA有很多订单。

预期结果:

CUSTOMERDETAIL  ORDERDETAIL
AAA (HOW MANY TIMES HE ORDER AND ORDER DETAILS)

Answer 1

     Create Table Customer (CustomerId int identity(1,1),Name varchar(20))
     Create Table OrderDetail(OrderDetailId int identity(1,1), CustomerId int, Item varchar(20), Quantity int)

    Insert into Customer values('AAA')
    Insert into Customer values('BBB')
    Insert into Customer values('CCC')

    Insert into OrderDetail values(1,'Apple',10)
    Insert into OrderDetail values(1,'Banana',10)
    Insert into OrderDetail values(1,'Mango',10)

    select y.total, x.Item,x.quantity from
    (
    select c.customerId as customerId, d.Item, d.quantity from customer c inner join orderdetail d
    on      c.customerId = d.customerId
    )x
    inner join 
    (
        select customerid, COUNT(customerId)as total from orderdetail group by customerId
    )y
    on x.customerId = y.customerId