CREATEORREPLACEVIEWview_nameASselect_statement; 注意:在CREATE VIEW语句中使用OR REPLACE子句时,如果该视图不存在,它将创建一个新视图,否则将替换现有视图。 下面的SQL语句将替换或更改现有视图emp_dept_view视图的定义,方法是向其添加一个新列salary。
DB2 - SQL Create View Statement A view provides a different way of looking at the data in one or more tables. View is a virtual table consisting of a SQL SELECT statement that accesses data from one or more tables or views. A view contains rows and columns, just like a real table. ...
第二十四章 SQL命令 CREATE VIEW(一) 创建视图 大纲 CREATE [OR REPLACE] VIEW view-name [(column-commalist)] AS select-statement [ WITH READ ONLY | WITH [level] CHECK OPTION ] 参数 view-name - 正在创建的视图的名称。有效的标识符,受与表名相同的附加命名限制。视图名称可以是限定的(schema.view...
<create_view_statement>::= CREATE [OR REPLACE] VIEW [(<alias_name>,...)] AS <query_expression> [WITH CHECK OPTION] Examples SQL Tutorial, View Tables Concepts of the Database System, Objects in the Schema HOTEL Explanation If no schema is specified in the view table name ( ...
A view can be updated with theCREATE OR REPLACE VIEWstatement. SQL CREATE OR REPLACE VIEW Syntax CREATEORREPLACEVIEWview_nameAS SELECTcolumn1,column2, ... FROMtable_name WHEREcondition; The following SQL adds the "City" column to the "Brazil Customers" view: ...
Oracle CREATE VIEW syntax To create a new view in a database, you use the following Oracle CREATE VIEW statement: CREATE [OR REPLACE] VIEW view_name [(column_aliases)] AS defining-query [WITH READ ONLY] [WITH CHECK OPTION] Code language: SQL (Structured Query Language) (sql) ...
CREATE VIEW [Current Product List] AS SELECT ProductID,ProductName,Category FROM Products WHERE Discontinued=NoSQL ServerALTER VIEW [ schema_name . ] view_name [ ( column [ ,...n ] ) ] [ WITH <view_attribute> [ ,...n ] ] AS select_statement [ WITH CHECK OPTION ] [ ; ] <view...
This chapter shows how to create, update, and delete a view. SQL CREATE VIEW Statement In SQL, a view is a virtual table based on the result-set of an SQL statement. A view contains rows and columns, just like a real table. The fields in a view are fields from one or more real ...
CREATE VIEW +2 6 Contributors TheCREATE VIEWstatement saves aSELECTstatement as a queryable object, similar to a table. Views in TiDB are non-materialized. This means that as a view is queried, TiDB will internally rewrite the query to combine the view definition with the SQL query....
create view语句是将某个查询数据的定义保留下来,以便随时调用,这就是所谓的视图。视图本身不存储查询结果,只是一个定义。 Syntax:CREATE[ORREPLACE] [ALGORITHM={UNDEFINED|MERGE|TEMPTABLE}] [DEFINER={user|CURRENT_USER}] [SQLSECURITY { DEFINER|INVOKER }]VIEWview_name [(column_list)]ASselect_statement ...