我们如何基于另一个现有视图创建MySQL视图?
在MySQL中,我们可以创建基于另一个现有视图的视图。为了使其理解,我们使用以下数据查看“信息”-
mysql> Create view info AS Select Id, Name, Subject FROM student_info;mysql> Select * from Info;
+------+---------+------------+
| Id | Name | Subject |
+------+---------+------------+
| 101 | YashPal | History |
| 105 | Gaurav | Literature |
| 125 | Raman | Computers |
| NULL | Ram | Computers |
+------+---------+------------+
4 rows in set (0.00 sec)
现在,借助以下查询,我们正在基于现有视图“ info”创建另一个视图名称“ info_less”-
mysql> Create view info_less AS Select Id, Name, Subject FROM info WHERE id >= 120;mysql> Select * from info_less;
+------+-------+-----------+
| Id | Name | Subject |
+------+-------+-----------+
| 125 | Raman | Computers |
+------+-------+-----------+
1 row in set (0.03 sec)
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