我们如何通过基于基表中的模式匹配选择数据来创建MySQL视图？
MySQLLIKE运算符用于根据模式匹配选择数据。同样，我们可以将LIKE运算符与视图结合使用，以根据基表中的模式匹配选择特定数据。为了理解这个概念，我们使用具有以下数据的基本表“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)
示例
以下查询将创建一个名为“Info”的视图，以使用“LIKE”运算符基于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%'; 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)
我们也可以将NOT与LIKE运算符一起使用-
mysql> Create or Replace view Info AS SELECT * from student_info WHERE Name NOT LIKE'%Ra%'; 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)