html - 合并数据库表并形成一张表

Question

我有两张表，一张是客户详情，另一张是订单详情。每次客户订购东西时，它都会将其存储在数据库中。我怎样才能找到哪些客户订单以及他们订购了多少次，并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

Answer 2

假设您有这样的架构：

客户表（客户）

ID (Customer Id) int primary key
Name varchar(100)

订单表（订单）

ID (Order ID) int
cusotmer_id (reference id of customer table primary key-ID) int
quality int
price float

针对 eash 客户的第一次订单计数：

select count(o.customer_id) as total_order, c.* from customer c left join orders o on c.ID = o.customer_id

针对单个客户的订单列表：

select c.*, o.* from customer c内部连接订单 o on c.ID = o.customer_id where c.ID = 1

我希望这能帮到您。

Answer 3

以下查询给出了我的期望。

SELECT name,items,price FROM customerdetail INNER JOIN orderdetail ON customerdetail .sno=orderdetail .id WHERE id=1 ;