SQL INNER JOIN 关键字
SQL INNER JOIN 关键字
INNER JOIN 关键字在表中存在至少一个匹配时返回行。
SQL INNER JOIN 语法
SELECT column_name(s)
FROM table1
INNER JOIN table2
ON table1.column_name=table2.column_name;
FROM table1
INNER JOIN table2
ON table1.column_name=table2.column_name;
或：
SELECT column_name(s)
FROM table1
JOIN table2
ON table1.column_name=table2.column_name;
FROM table1
JOIN table2
ON table1.column_name=table2.column_name;
注释：INNER JOIN 与 JOIN 是相同的。
演示数据库
在本教程中，我们将使用众所周知的 Northwind 样本数据库。
下面是选自 \”Customers\” 表的数据：
| CustomerID | CustomerName | ContactName | Address | City | PostalCode | Country |
|---|---|---|---|---|---|---|
| 1 | Alfreds Futterkiste | Maria Anders | Obere Str. 57 | Berlin | 12209 | Germany |
| 2 | Ana Trujillo Emparedados y helados | Ana Trujillo | Avda. de la Constitución 2222 | México D.F. | 05021 | Mexico |
| 3 | Antonio Moreno Taquería | Antonio Moreno | Mataderos 2312 | México D.F. | 05023 | Mexico |
选自 \”Orders\” 表的数据：
| 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 |
SQL INNER JOIN 实例
下面的 SQL 语句将返回有下订单的所有客户：
实例
SELECT Customers.CustomerName, Orders.OrderID
FROM Customers
INNER JOIN Orders
ON Customers.CustomerID=Orders.CustomerID
ORDER BY Customers.CustomerName;
FROM Customers
INNER JOIN Orders
ON Customers.CustomerID=Orders.CustomerID
ORDER BY Customers.CustomerName;
常见问题
相关文章
猜你喜欢
- SQL 简介 2015-09-07
- SQL 连接 2015-09-07
- SQL CREATE INDEX 2015-09-07
- SQL SUM() 2015-09-07
- SQL SELECT 2015-09-07
- SQL LEFT JOIN 2015-09-07
- SQL ALTER 2015-09-07
- SQL GROUP BY 2015-09-07
- SQL 语法 2015-09-07
- SQL RIGHT JOIN 2015-09-07
