我们如何通过从基表中选择某些范围的值来创建 MySQL 视图？

mysql> Select * from Student_info; +------+---------+------------+------------+ | id | Name | Address | Subject | +------+---------+------------+------------+ | 101 | YashPal | Amritsar | History | | 105 | Gaurav | Chandigarh | Literature | | 125 | Raman | Shimla | Computers | | 130 | Ram | Jhansi | Computers | | 132 | Shyam | Chandigarh | Economics | | 133 | Mohan | Delhi | Computers | +------+---------+------------+------------+ 6 rows in set (0.00 sec)

示例

以下查询将创建一个名为“Info”的视图，通过使用“BETWEEN”运算符选择特定范围内的某些值 -

mysql> Create or Replace view Info AS SELECT * from student_info WHERE Name BETWEEN 'C' AND 'P';
Query OK, 0 rows affected (0.14 sec)

mysql> Select * from info;
+------+--------+------------+------------+
| id   | Name   | Address    | Subject    |
+------+--------+------------+------------+
| 105  | Gaurav | Chandigarh | Literature |
| 133  | Mohan  | Delhi      | Computers  |
+------+--------+------------+------------+
2 rows in set (0.00 sec)

同样，我们可以将 NOT 与 BETWEEN 运算符结合使用来选择与查询中写入的值不同的范围 -

mysql> Create or Replace view Info AS SELECT * from student_info WHERE Name NOT BETWEEN 'C' AND 'P';
Query OK, 0 rows affected (0.06 sec)

mysql> Select * from Info;
+------+---------+------------+-----------+
| id   | Name    | Address    | Subject   |
+------+---------+------------+-----------+
| 101  | YashPal | Amritsar   | History   |
| 125  | Raman   | Shimla     | Computers |
| 130  | Ram     | Jhansi     | Computers |
| 132  | Shyam   | Chandigarh | Economics |
+------+---------+------------+-----------+
4 rows in set (0.00 sec)

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