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How can we create a MySQL view using INNER JOIN?

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2023-09-10 15:09:17740browse

我们如何使用 INNER JOIN 创建 MySQL 视图?

To illustrate how to make a MySQL view using INNER JOIN, we use the following data from the "Customers" and "Resreve" tables -

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)

Now, the following The query will use INNER JOIN on the above table to create a view called "customer_V" which will contain the names of customers who booked one or more cars.

mysql> CREATE VIEW customer_V AS Select DISTINCT Name FROM customers c INNER JOIN Reserve R ON R.id = c.customer_id;
Query OK, 0 rows affected (0.08 sec)

mysql> Select * from customer_V;
+---------+
| Name    |
+---------+
| Rahul   |
| Yashpal |
| Gaurav  |
+---------+
3 rows in set (0.02 sec)

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