基本语法 可以使用 DROP VIEW 语句来删除视图。 语法格式如下: DROP VIEW <视图名1> [ , <视图名2> …] 其中:<视图名>指定要删除的视图名。DROP VIEW 语句可以一次删除多个视图,但是必须在每个视图上拥有 DROP 权限。 mysql>DROP VIEW IF EXISTS v_students_info; Query OK,0rows affected (0.00sec) mys...
DROPVIEWIFEXISTSemployees_view; 1. 这样,如果employees_view视图不存在,MySQL将不会报错。 删除多个视图 如果需要删除多个视图,可以按照以下语法来操作: DROPVIEW[IFEXISTS]view_name1,view_name2,...; 1. 其中,view_name1,view_name2等表示要删除的视图的名称列表。 删除所有视图 如果想要删除所有的视图,可以...
AS SELECT id,name,job from emp where id < 8; 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 🚀删除视图: -- IF EXISTS关键字,表示只有视图存在时才删除,视图不存在则不执行删除。 DROP VIEW [IF EXISTS] 视图1 [,视图2,视图3...]; 1. 2. -- 演示 -- 删除视图emp_v_1 DROP VIE...
stu_v_1; select * from stu_v_1; select *from stu_v_1 where id < 3; -- 修改视图 create or replace view stu_v_l as select id,name,no from student where id <= 10; alter view stu_v_1 as select id,name from student where id <= 10; -- 删除视图 drop view if exists stu_...
CREATE VIEW province_view AS SELECT * FROM province; SELECT * FROM province_view; 说明:创建的视图表province_view与province表一模一样。 2.1指定视图显示的字段: CREATE VIEW province_view1(id,name) AS SELECT id,pro_name FROM province; mysql> SELECT * FROM province_view1; ...
例如,我们创建视图view_user_course,如下: drop view if exists view_user_course; create view view_user_course as ( select uc.id as id, u.name as username, c.name as coursename from user u left join user_course uc on u.id = uc.userid ...
TheDROP DATABASE IF EXISTS,DROP TABLE IF EXISTS, andDROP VIEW IF EXISTSstatements are always replicated, even if the database, table, or view to be dropped does not exist on the source. This is to ensure that the object to be dropped no longer exists on either the source or the replic...
13.1.32 DROP VIEW Statement DROPVIEW[IFEXISTS]view_name[,view_name]...[RESTRICT|CASCADE] DROP VIEWremoves one or more views. You must have theDROPprivilege for each view. If any views named in the argument list do not exist, the statement returns an error indicating by name which nonex...
DROP VIEW[IF EXISTS] view_name; 例如: DROP VIEW IF EXISTS active_users; 如果视图active_users存在,则会成功删除该视图;如果不存在,则会忽略删除操作[^2^]。 3. 注意事项 权限要求:执行DROP语句需要相应的权限,通常需要管理员权限[^1^]。 不可恢复:一旦执行DROP语句,被删除的对象将无法恢复,因此在执行前...
DROP VIEW IF EXISTS view_name, ...#删除数据库db_school中的视图v_studentDROP VIEW IF EXISTS db_school. v_student; 修改视图定义 像修改表一样,可以使用ALTER VIEW语句来修改视图定义,语法如下: ALTER VIEW view_name [(column_list)] ASSELECT_statement [WITH[CASCADED | LOCAL] CHECK OPTION] #修改...