为了说明使用 LEFT JOIN 的 MySQL 视图的制作，我们使用“Customers”和“Resreve”表中的以下数据 -
mysql> Select * from customers;
+-------------+----------+
| Customer_Id | Name |
+-------------+----------+
| 1 | Rahul |
| 2 | Yashpal |
| 3 | Gaurav |
| 4 | Virender |
+-------------+----------+
4 rows in set (0.00 sec)
mysql> Select * from reserve;
+------+------------+
| ID | Day |
+------+------------+
| 1 | 2017-12-30 |
| 2 | 2017-12-28 |
| 2 | 2017-12-25 |
| 1 | 2017-12-24 |
| 3 | 2017-12-26 |
+------+------------+
5 rows in set (0.00 sec)现在，以下查询将使用上述表上的 LEFT JOIN 创建一个名为“customer_VLeft”的视图，其中包含尚未预订任何汽车的客户的姓名。< /p>
mysql> Create view customer_Vleft AS SELECT NAME from customers LEFT JOIN RESERVE ON customer_id = id WHERE id IS NULL;
Query OK, 0 rows affected (0.13 sec)
mysql> Select * from customer_Vleft;
+----------+
| NAME |
+----------+
| Virender |
+----------+
1 row in set (0.00 sec)
