←SQL AUTO INCREMENT 字段SQL Server 和 MySQL 中的 Date 函数→ SQL CREATE VIEW、REPLACE VIEW、 DROP VIEW 语句 SQL 视图(Views) 视图是可视化的表。 本章讲解如何创建、更新和删除视图。 SQL CREATE VIEW 语句 在SQL 中,视图是基于 SQL 语句的结果集的可视化的表。 视图包含行和列,就像一个真实的表。
SQL Dropping a View A view is deleted with theDROP VIEWstatement. SQL DROP VIEW Syntax DROPVIEWview_name; The following SQL drops the "Brazil Customers" view: Example DROPVIEW[Brazil Customers]; Track your progress - it's free! Log inSign Up...
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 » ...
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 tables in the database. You can add SQL functions, WHERE, and JOIN statements to a vie...
| view | +---+ 6 rows in set (0.00 sec) 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. mysql>#进入数据库 view # mysql> USE view; Database changed 1. 2. 3. 2、删除名为 selectproduct 的视图 mysql>查看数据库 view 中视图...
如果找不到视图,Azure Databricks 会引发 TABLE_OR_VIEW_NOT_FOUND 错误。 示例 SQL 复制 -- Assumes a view named `employeeView` exists. > DROP VIEW employeeView; -- Assumes a view named `employeeView` exists in the `usersc` schema > DROP VIEW usersc.employeeView; -- Assumes a view ...
本文分为5个部分,即drop、alter、insert 和analyze、Flink SQL常见的操作示例。 一、DROP DROP 语句可用于删除指定的 catalog,也可用于从当前或指定的 Catalog 中删除一个已经注册的表、视图或函数。 Flink SQL 截至版本Flink 1.17支持以下 DROP 语句: DROP CATALOG DROP TABLE DROP DATABASE DROP VIEW DROP FUNCTI...
<drop_view_statement>::= DROP VIEW [<cascade_option>] Examples SQL Tutorial, View Tables Explanation The table name must identify an existing view table. The database user must be the owner of the specified view table or have the DROPIN privilege for the schema to which the view...
For more information, see CREATE VIEW. Note that if you include CASCADE and the count of database objects dropped runs to ten or more, it's possible that your database client won't list all of the dropped objects in the summary results. This is typically because SQL client tools have ...
An SQL view is a virtual table or a result-set generated by the SELECT query. Unlike physical tables, views do not store data in a database. When we run the SELECT query to populate the data, it executes a query that creates the view (View definition). ...