MySQL 如何通过选择基表的模式匹配数据来创建MySQL视图？

MySQL LIKE运算符用于基于模式匹配选择数据。同样，我们可以使用带有视图的LIKE运算符来从基表中根据模式匹配选择特定数据。为了理解这个概念，我们使用拥有以下数据的基表’student_info’ –

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)

阅读更多：MySQL 教程

例子

以下查询将创建一个名为’Info’的视图，通过使用’LIKE’运算符根据模式匹配选择一些特定值 –

mysql> Create or Replace view Info AS SELECT * from student_info WHERE Name LIKE '%Ra%';
Query OK，0 rows affected（0.11 sec）

mysql> Select * from Info;
+------+--------+------------+------------+
| id   | Name   | Address    | Subject    |
+------+--------+------------+------------+
| 105  | Gaurav | Chandigarh | Literature |
| 125  | Raman  | Shimla     | Computers  |
| 130  | Ram    | Jhansi     |  Computers |
+------+--------+------------+------------+
3 rows in set (0.00 sec)

我们也可以使用NOT与LIKE运算符，如下所示-

mysql> Create or Replace view Info AS SELECT * from student_info WHERE Name NOT LIKE'%Ra%';
Query OK，0 rows affected（0.14 sec）

mysql> Select * from info;
+------+---------+------------+-----------+
| id   | Name    | Address    | Subject   |
+------+---------+------------+-----------+
| 101  | YashPal | Amritsar   | History   |
| 132  | Shyam   | Chandigarh | Economics |
| 133  | Mohan   | Delhi      | Computers |
+------+---------+------------+-----------+
3 rows in set (0.00 sec)