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...
Create View: CREATE VIEW emp_view ASSELECT empid, empnameFROM empWHERE empid>5;select * from emp_view Drop view: Drop view view_name; 2 Rajanikant Hawaldar 32 38.8k 443.9k 5y Please refer these links for simple understanding https://www.w3schools.com/sql/sql_view.asp http://www.mys...
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: ...
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...
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 CREATEVIEWview_nameAS SELECTcolumn1,column2, ... FROMtable_name WHEREcondition; 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。
CREATE VIEWIn SQL, a view is a virtual table based on the result set of an SQL statement.The CREATE VIEW command creates a view. The following SQL creates a view that selects all customers from Brazil:Example CREATE VIEW [Brazil Customers] AS SELECT CustomerName, ContactName FROM Customers...
The CREATE OR REPLACE VIEW command updates a view.The following SQL adds the "City" column to the "Brazil Customers" view:Example CREATE OR REPLACE VIEW [Brazil Customers] AS SELECT CustomerName, ContactName, City FROM Customers WHERE Country = "Brazil"; Try it Yourself » ...
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: ...