JOIN SQL 按日期查询

Question

非常感谢...这是我的最后一个问题：

我有三个包含以下列的表格：

1. 客户：

客户 ID 名字 姓氏

1. 交易：

Trans ID 客户 ID 代表 ID 订单日期

1. 代表：

代表身份证名姓氏

我需要显示所有交易信息，以及在特定日期发生的代表姓名和客户姓名。这个查询对吗？

SELECT * 
FROM [Transactions], Clients.first name, Clients.last name,     Representatives.first name, Representatives. last name
 INNER JOIN [Clients]
 ON Transactions.ClientID= Clients.Client ID
 INNER JOIN [Representatives]
 ON Transactions.RepresntativeID = Representatives.Represntative ID
 WHERE Transactions.OrderDate BETWEEN '1996-09-18' AND '1996-11-27';

这是对的还是我全错了？

Answer 1

WHERE 在ON 之后和ORDER BY 之前

; 也放在最后而不是在中间

SELECT * 
FROM [Orders] 
JOIN [Customers]
  ON Orders.CustomerID = Customers.CustomerID
WHERE Orders.OrderDate BETWEEN '1996-09-18' AND '1996-11-27'
ORDER BY Customers.CustomerName;

Answer 2

SELECT Clients.[first NAME] AS ClientFirstName
      ,Clients.[last NAME] AS ClientLastName
      ,Representatives.[first NAME] AS RepresentativesFirstName
      ,Representatives.[last NAME] AS RepresentativesLastName
      ,Transactions.*
FROM [Transactions]
INNER JOIN [Clients]
    ON Transactions.ClientID = Clients.Client ID
INNER JOIN [Representatives]
    ON Transactions.RepresntativeID = Representatives.Represntative ID
WHERE Transactions.OrderDate BETWEEN '1996-09-18'
        AND '1996-11-27';

你期望的结果列应该把它放在SELECT。 From 是您的表或数据集。

此外，您可以使用别名来简化 SQL，如下所示。

SELECT c.[first NAME] AS ClientFirstName
      ,c.[last NAME] AS ClientLastName
      ,r.[first NAME] AS RepresentativesFirstName
      ,r.[last NAME] AS RepresentativesLastName
      ,t.*
FROM [Transactions] t
INNER JOIN [Clients] c
    ON t.ClientID = c.Client ID
INNER JOIN [Representatives] r
    ON t.RepresntativeID = r.Represntative ID
WHERE t.OrderDate BETWEEN '1996-09-18'
        AND '1996-11-27';