Concat加入

Question

我正在尝试连接此表并加入另外两个表。
我的输出应包含以下列：客户全名（名字和姓氏），产品描述，订购数量。

Table Name Customers:
CustomerId
FirstName 
Lastname
City 
State

Table Name: Orders
OrderNo
CustomerId
ProductID
Quantity

Table: Products
ProductID
Description
Quantity

Answer 1

假设客户ID或产品ID均不能为null，则进行内部联接。

SELECT C.FirstName + ' ' + C.LastName AS [FullName],
       P.Description AS [ProductDescription],
       O.Quantity AS [QuantityOrdered]
  FROM Orders O
  JOIN Customers C
    ON C.CustomerId = O.CustomerId
  JOIN Products P
    ON P.ProductId = O.ProductId