CREATE [OR REPLACE] [FORCE|NOFORCE] VIEW view_name [(alias[, alias]...)] AS subquery [WITH CHECK OPTION [CONSTRAINT constraint]] [WITH READ ONLY] 说明 OR REPLACE :若所创建的试图已经存在,ORACLE自动重建该视图; FORCE :不管基表是否
b.语法:create [or replace][force] view [schema.]viewname [column1,column2,..] as select ... [with check option] [constraint constraint name] [with read only]; 说明:or replace:如果存在同名的视图, 则使用新视图"替代"已有的视图。 force:"强制"创建视图,不考虑基表是否存在,也不考虑是否具有...
CREATE [OR REPLACE] [ALGORITHM = { UNDEFINED | MERGE | TEMPTABLE}] [DEFINER = {user | CURRENT_USER }] [SQL SECURITY { DEFINER | INVOKER }] VIEW view_name [(column_list)] AS select_statement [WITH [CASCADED | LOCAL] CHECK OPTION] 虽然视图是虚拟表,但是可以对其进行更新,本质上就是更新...
-- 创建视图 CREATE [OR REPLACE] [ALGORITHM = {UNDEFINED | MERGE | TEMPTABLE}] VIEW view_name [(column_list)] AS select_statement - 视图名必须唯一,同时不能与表重名。 - 视图可以使用select语句查询到的列名,也可以自己指定相应的列名。 - 可以指定视图执行的算法,通过ALGORITHM指定。 - column_list...
create tableName(~~~)engine=InnoDB;# 在上面的engine=存储引擎类型 就是存储引擎的设计语句 # 我们默认情况下是InoDB存储引擎 复制 同样我们可以通过查看创建方法来得到表的存储引擎类型: show create table 表名; 复制 存储引擎类型以及特点 我们可以
CREATE OR REPLACE VIEW v AS SELECT '天天向上' AS 汉字,'TTXS' AS 首拼 FROM dual; 1. 使用CONNECT BY 子句,将视图 v 循环显示并给出定位表示,示例语句如下所示: SELECT v.汉字, v.首拼, LEVEL FROM v CONNECT BY LEVEL <= LENGTH (v.汉字); ...
CREATE TABLE dst_tbl LIKE src_tbl 要求src_tbl必须是base table。mysqldump和mysqlpump不会导出information_schema，不会导出MySQL Schema中数据字典表，需导出存储过程和事件需指定–routines和--events选项，并且用户需要全局selet权限。Authentication Plugin MySQL8.0将默认身份验证插件从mysql_native_password变更为...
CREATE TABLESPACE Create_tablespace_priv Server administration CREATE TEMPORARY TABLES Create_tmp_table_priv Tables CREATE USER Create_user_priv Server administration CREATE VIEW Create_view_priv Views DELETE Delete_priv Tables DROP Drop_priv Databases, tables, or views DROP ROLE Drop_role_priv Server ...
Then the view replicates properly, and can be dumped and reloaded without causing an error. To modify the definition, drop and create the view again with DROP VIEW and CREATE VIEW, or replace the definition with CREATE OR REPLACE VIEW. ...
4.DELETE：用于从数据库表中删除数据。5.CREATE：用于创建数据库、表、索引等。6.ALTER：用于修改数据...