Tạo View MySQL có subquery

Tạo view với subquery. Bảng Cars:

mysql> select * from cars;
+------+--------------+---------+
| ID   | Name         | Price   |
+------+--------------+---------+
|    1 | Nexa         |  750000 |
|    2 | Maruti Swift |  450000 |
|    3 | BMW          | 4450000 |
|    4 | VOLVO        | 2250000 |
|    5 | Alto         |  250000 |
|    6 | Skoda        | 1250000 |
|    7 | Toyota       | 2400000 |
|    8 | Ford         | 1100000 |
+------+--------------+---------+
8 rows in set (0.08 sec)

Tạo view cars_avgprice lấy xe có giá > trung bình (subquery trong ngoặc):

mysql> Create view cars_avgprice AS SELECT NAME, Price FROM Cars WHERE price > (SELECT AVG(Price) from cars);
Query OK, 0 rows affected (0.12 sec)
mysql> Select * from cars_avgprice;
+--------+---------+
| NAME   | Price   |
+--------+---------+
| BMW    | 4450000 |
| VOLVO  | 2250000 |
| Toyota | 2400000 |
+--------+---------+
3 rows in set (0.03 sec)

Chạy subquery riêng để hiểu:

mysql> Select AVG(Price) from cars;
+--------------+
| AVG(Price)   |
+--------------+
| 1612500.0000 |
+--------------+
1 row in set (0.00 sec)

View chỉ chứa xe giá > 1.612.500.