在MySQL中,我们可以创建一个基于另一个现有视图的视图。为了让它理解,我们有一个名为'Info'的视图,其中包含以下数据-
mysql> Create view info AS Select Id, Name, Subject FROM student_info; Query OK, 0 rows affected (0.11 sec) 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,通过以下查询,我们正在创建一个名为'info_less'的新视图,该视图基于现有视图'info' -
mysql> Create view info_less AS Select Id, Name, Subject FROM info WHERE id >= 120; Query OK, 0 rows affected (0.25 sec) mysql> Select * from info_less; +------+-------+-----------+ | Id | Name | Subject | +------+-------+-----------+ | 125 | Raman | Computers | +------+-------+-----------+ 1 row in set (0.03 sec)
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