JOIN SQL查詢日期

Question

非常感謝...這是我的最後一個問題：

我有三個表有以下欄目：

1. 客戶：

客戶名稱姓氏

1. 個交易：

反式ID的ClientID RepresentativeID訂購日期

代表：

代表ID名姓

I需要顯示的所有交易信息，以及在特定日期發生的代表名稱和客戶名稱。這個查詢是否正確？

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'; 

這是正確的還是我得到了所有錯誤？

Answer 1

WHERE去ON後ORDER BY

也;在去年底沒有中間

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'; 

您預期的結果列應該把什麼它SELECT之前。 From是你的表或數據集。

另外，您可以使用別名來簡化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';