1、普通视图 数据库中的视图(view)是从一张或多张数据库表查询导出的虚拟表,反映基础表中数据的变化,且本身不存储数据。 2、物化视图【materialized view】 2.1、概念:物化视图是查询结果集的一份持久化存储,所以它与普通视图完全不同,而非常趋近于表。可以是基础表中部分数据的一份简单拷贝,也可以是多表join之...
1、普通视图 数据库中的视图(view)是从一张或多张数据库表查询导出的虚拟表,反映基础表中数据的变化,且本身不存储数据。 2、物化视图【materialized view】 2.1、概念:物化视图是查询结果集的一份持久化存储,所以它与普通视图完全不同,而非常趋近于表。 可以是基础表中部分数据的一份简单拷贝,也可以是多表join...
Understanding PostgreSQL views and materialized views is key to using the database effectively. Learn the difference between views and materialized views here!
In such cases, we must be able to create a virtual table that can only display the required attributes from a table. This is possible via View and Materialized View which we will discuss in this article. We will also discuss the differences between view and materialized View with the help ...
任务在每晚使用这个 SQL 语句更新该统计信息: REFRESH MATERIALIZED VIEW sales_summary; CREATE MATERIALIZED VIEW 定义一个新的物化视图 CREATE MATERIALIZED VIEW [ IF NOT EXISTS ] table_name [ (column_name [, ...] ) ] [ WITH ( storage_parameter [= value] [, ... ] ) ] ...
一个有用的物化视图示例是，用于为销售员创建控制面板显示图表。通过计划任务，每天运行特定SQL语句更新该统计信息。创建一个新的物化视图，即通过`CREATE MATERIALIZED VIEW`命令定义，该命令执行查询填充视图，除非使用`WITH NO DATA`选项。之后，可以使用`REFRESH MATERIALIZED VIEW`命令刷新视图内容。物化...
Materialized View - A materialized view takes a different approach in which the query result is cached as a concrete table that may be updated from the original base tables from time to time. This enables much more efficient access, at the cost of some data being potentially out-of-date. ...
Materialized View responds faster as compared to View. But View always provides up to date information to the user. Related Differences: Difference Between Where and Having Clause in SQL Difference Between Group By and Order By in SQL Difference Between Fact Table and Dimension Table ...
SQL复制 -- Create a materialized view if it doesn't exist>CREATEMATERIALIZEDVIEWIFNOTEXISTSsubscribed_moviesASSELECTmo.member_id, mb.full_name, mo.movie_titleFROMmoviesASmoINNERJOINmembersASmbONmo.member_id = mb.id;-- Create and schedule a materialized view to be refreshed every day....
SQL复制 -- Refreshes the materialized view to reflect the latest available data> REFRESH MATERIALIZED VIEW catalog.schema.view_name;-- Refreshes the streaming table to process the latest available data-- The current catalog and schema will be used to qualify the table> REFRESH STREAMING TABLE st...