在MySQL中，使用CREATE OR REPLACE VIEW语句可以修改视图。视图存在时，可以对视图进行修改；视图不存在时，可以创建视图。CREATE OR REPLACE VIEW语句的语法格式如下：CREATE OR REPLACE [ALGORITHM={UNDEFINED|MERGE|TEMPTABLE}]VIEW 视图名[(属性清单)]AS SELECT语句 [WITH [CASCADED|LOCAL] CHECK OPTION...
create or replace view用法 在MySQL中,CREATE OR REPLACE VIEW语句用于创建或替换视图。其语法格式为: `CREATE [ORREPLACE] [ALGORITHM={UNDEFINEDTEMPTABLE} ] VIEW view_name [ (column_list) ] ASselect_statement [WITH[CASCADED|LOCAL] CHECK OPTION]` * `CREATE`关键词用于创建新的视图。 * `ORREPLACE`...
创建视图是指在已经存在的MySQL数据库表上建立视图。视图可以建立在一张表中,也可以建立在多张表中。 基本语法 可以使用 CREATE VIEW 语句来创建视图。 语法格式如下: CREATE VIEW <视图名> AS <SELECT语句> 语法说明如下。 <视图名>:指定视图的名称。该名称在数据库中必须是唯一的,不能与其他表或视图同名。
$add_a_food_database_ID = mysql_query($mysql_query); //mysql_query contains the above CREATE OR REPLACE VIEW sql code $CountQuery_ID = mysql_query("SELECT COUNT(*) FROM UserPrefsPlusNewFoods"); $result_array = mysql_fetch_array($CountQuery_ID); ...
二. 创建MySQL视图——create view 语法 create [or replace] [algorithm = {undefined | merge | temptable}] view [db_name.]view_name [(column_list)] as select_statement [with [cascaded | local] check option] 通过该语句可以创建视图,若给定了[or replace],则表示当已具有同名的视图时,将覆盖原...
MySQL Updating a View A view can be updated with theCREATE OR REPLACE VIEWstatement. CREATE OR REPLACE VIEW Syntax CREATEORREPLACEVIEWview_nameAS SELECTcolumn1,column2, ... FROMtable_name WHEREcondition; The following SQL adds the "City" column to the "Brazil Customers" view: ...
mysql> CREATE OR REPLACE ALGORITHM=TEMPTABLE -> VIEW work_view(ID,NAME)-> AS SELECT id,name FROM work;话说，CREATE OR REPLACE语句非常灵活 在视图存在的情况下可对视图进行修改，视图不在的情况下可创建视图 其基本用法和CREATE VIEW 几乎一致 ALTER语句修改视图 mysql> ALTER VIEW work_view2...
mysql> create or replace view vwEmployees(EmployeeName,gender) as select concat(first_name, " ",last_name),gender from tblEmployees; Run the following SELECT query to view the data fromvwEmployees: mysql> select * from vwEmployees Query output: ...
theuservalue should be a MySQL account specified as'user_name'@'host_name',CURRENT_USER, orCURRENT_USER(). The permitteduservalues depend on the privileges you hold, as discussed inSection 27.6, “Stored Object Access Control”. Also see that section for additional information about view securi...
CREATE [OR REPLACE] [ALGORITHM = {UNDEFINED | MERGE | TEMPTABLE}] [DEFINER = user] [SQL SECURITY { DEFINER | INVOKER }] VIEW view_name [(column_list)] AS select_statement [WITH [CASCADED | LOCAL] CHECK OPTION] The CREATE VIEW statement creates a new view, or replaces an existing vie...