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SQL RIGHT JOIN 關鍵字
SQL RIGHT JOIN 關鍵字
RIGHT JOIN 關鍵字從右表（table2）返回所有的行，即使左表（table1）中沒有匹配。如果左表中沒有匹配，則結果為 NULL。
SQL RIGHT JOIN 語法
SELECT column_name(s)
FROM table1
RIGHT JOIN table2
ON table1.column_name=table2.column_name;
FROM table1
RIGHT JOIN table2
ON table1.column_name=table2.column_name;
或：
SELECT column_name(s)
FROM table1
RIGHT OUTER JOIN table2
ON table1.column_name=table2.column_name;
FROM table1
RIGHT OUTER JOIN table2
ON table1.column_name=table2.column_name;
注釋：在某些數據庫中，RIGHT JOIN 稱為 RIGHT OUTER JOIN。
演示數據庫
在本教程中，我們將使用眾所周知的 Northwind 樣本數據庫。
下面是選自 "Orders" 表的數據：
| OrderID | CustomerID | EmployeeID | OrderDate | ShipperID |
|---|---|---|---|---|
| 10308 | 2 | 7 | 1996-09-18 | 3 |
| 10309 | 37 | 3 | 1996-09-19 | 1 |
| 10310 | 77 | 8 | 1996-09-20 | 2 |
選自 "Employees" 表的數據：
| EmployeeID | LastName | FirstName | BirthDate | Photo | Notes |
|---|---|---|---|---|---|
| 1 | Davolio | Nancy | 12/8/1968 | EmpID1.pic | Education includes a BA in psychology..... |
| 2 | Fuller | Andrew | 2/19/1952 | EmpID2.pic | Andrew received his BTS commercial and.... |
| 3 | Leverling | Janet | 8/30/1963 | EmpID3.pic | Janet has a BS degree in chemistry.... |
SQL RIGHT JOIN 實例
下面的 SQL 語句將返回所有員工及他們處理的訂單：
實例
SELECT Orders.OrderID, Employees.FirstName
FROM Orders
RIGHT JOIN Employees
ON Orders.EmployeeID=Employees.EmployeeID
ORDER BY Orders.OrderID;
FROM Orders
RIGHT JOIN Employees
ON Orders.EmployeeID=Employees.EmployeeID
ORDER BY Orders.OrderID;
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