CREATE OR REPLACE VIEW view_name AS SELECT column1, column2, ... FROM table_name WHERE condition; 以下SQL将 "City" 列添加到 "Brazil Customers" 视图中:实例 CREATE OR REPLACE VIEW [Brazil Customers] AS SELECT CustomerName, ContactName, City FROM Customers WHERE Country = 'Brazil'; 亲自...
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 tables in the database. Watch given below video link for better understanding. https://www.youtube...
A virtual table based on the result-set of an SQL statement A function that modifies data in the database A temporary table used for backup purposesSubmit Answer » What is an Exercise? Test what you learned in the chapter: SQL View by completing 6 relevant exercises. To try more SQL...
SQL Updating a View 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: ...
https://learn.microsoft.com/en-us/sql/relational-databases/performance/joins?view=sql-server-2017 ...
您可以将 SQL 语句和函数添加到视图中,并像数据来自单个表一样呈现数据。使用CREATE VIEW 语句创建视图。CREATE VIEW 创建视图语法CREATE VIEW view_name AS SELECT column1, column2, ... FROM table_name WHERE condition; 注意:视图总是显示最新的数据! 每次用户查询时,数据库引擎都会重新创建视图。
In SQL, a view is a virtual table based on the result set of an SQL statement. TheCREATE VIEWcommand creates a view. The following SQL creates a view that selects all customers from Brazil: Example CREATEVIEW[BrazilCustomers]AS SELECTCustomerName, ContactName ...
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You can add SQL statements and functions to a view and present the data as if the data were coming from one single table. A view is created with theCREATE VIEWstatement. CREATE VIEW Syntax CREATEVIEWview_nameAS SELECTcolumn1,column2, ... ...