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Basic usage of views and Indexes

ArticleDirectory Note: View Concept View is a transformation of the original database data, and is another way to view the data in the table.Method. You can think of a view as a moving window through which you can see the data you are interested in. A view is obtained from one or more actual tables whose data is stored in the dataLibrary. The tables used to generate a view are called the base tables of the view. A view can also beGenerated in another view. The view definition e

Data dictionaries and dynamic performance views

Built-indatabase ObjectsOther objects created with the database:· Data Dictionary· Performance tablesPl/sql Packages· Database event triggersData Dictionary· Central Toevery Oracle Database· Describes the database and it ' s objects· Contains read-only tables and views· Stored in the SYSTEM tablespace· Owned by the user SYS· Maintained by the Oracle server· Accessed with SELECTBase Tables Data Dictionary viewsThe data dictionary contains and parts:·

Django notes-generic views

Generic views 1. First glance at generic viewsGeneric views are actually a set of views functions, but these views functions are awesome.Help me write it. You can use it. This is more like a views library, but it focuses more on the followingSituations:1) complete a simple t

QT Models/views, delegates

The combination of the MVC view and the Controller object results in a model/view structure that still separates the data from the way it is presented to the user, making it possible to display the same data in several different views and implement a new type of view without altering the underlying data structure. In order to handle data input flexibly, the concept of delegation is introduced. There's something about introducing a delegate in this fra

Differences between simple and complex views in Oracle

A view is a logical table based on one or more tables or views. It does not contain data and allows you to query and modify the data in the table. A view-based table is called a base table, which is an Oracle database.There are five types of objects: tables, views, sequences, indexes, and synonyms. A view is a SELECT statement stored in the data dictionary. You can create a view to extract a logical set or

The difference between simple and complex views in Oracle ____oracle

A view is a logical table that is based on a table or multiple tables or views, and does not contain data, which allows you to query and modify the data in the table. The table on which the view is based is called the base table, and Oracle's database objects are grouped into five categories: tables, views, sequences, indexes, and synonyms. A view is a SELECT statement stored in a data dictionary. You can

Understanding of the concepts of indexes, views, triggers, stored procedures, cursors, etc. of the database

Tags: database index, views, triggers, stored procedures, cursors and other concepts of understandingUnderstanding of indexes, views, cursors, stored procedures, and triggersUnderstanding of indexes, views, cursors, stored procedures, and triggers1. Index1-1. Overview of the IndexWe combine a list of one or more columns in a table with the physical addresses reco

SQL Server Indexes and views

Ø Index1. What is an indexAn index is a list of data in a data table and a corresponding storage location that can be used to increase the speed of finding data in a table or view.2. Index classificationthe indexes in the database are divided into two main categories: Clustered and nonclustered indexes . SQL Server 2005 also provides unique indexes, indexed views, full-text indexes, XML indexes, and so on. clustered and nonclustered indexes are the mo

Oracle differentiates materialized views and tables at 10 GB

Oracle distinguishes materialized views from tables before 9i at the beginning of 10g. Many functions do not distinguish between tables and materialized views. After 10g. Many features differentiate tables from materialized views. The common comment on table statement is no longer valid for MATERIALIZED views and must

No_merge is used to solve inefficient access to data dictionary views

; Count (*)----------146 Used time: 00: 00: 00.08SQL> select count (*) from dba_objects; Count (*)----------31406 Used time: 00: 00: 00.08 The data volume of both views is not very large, and the result of the flute product is nothing more than 4 million. How can it be executed for such a long time: SQL> explain Plan2 select count (*) from dba_sequences, dba_objects; Explained. Used time: 00: 00: 00.00SQL> select * from table (dbms_xplan.display ); Pl

Openerp specifies view_id for both form and tree views.

Openerp specifies view_id for both form and tree views. This article describes how to use view_id to specify the form and tree views for the same object (inherited by the same name) in openerp. As this is not mentioned in the views and Events section in the official documentation, but it will be used in actual projects, so record and share it here! As mentioned

2. Understanding models, views, and controllers

1. Understanding models, views, and controllersThis articleArticleThe main purpose is to understand the three concepts of M, V, and C in ASP. net mvc.Through this article, we will learn how to coordinate ASP. net mvc and ASP. net mvc Architecture and ASP. NET web formsProgramStructure and ASP. Ii. Simple ASP. net mvc ProgramThe ASP. net mvc template of vs generates a very simple and complete ASP. net mvc program framework. Here we will use this prog

Typecho blog post views Statistics plugin stat Typecho installation Typecho code highlighting TYPECHOTTJX

This article to the Code Farm Introduction Typecho Blog Article views statistics plug-ins stat, need to code farmers can refer to. My new blog using the blog system is the Typecho blog system, the use of the time found that the blog system itself does not have the article browsing statistical functions, very unaccustomed. Search on the Internet after the discovery, there are related to the blog plug-ins can be implemented, the use of plug-ins is ver

discuz! Tutorial How to modify the theme views with a simple PHP file implementation?

This article explains how to modify the theme views with a simple PHP file. Many stationmaster needs to be able to modify the topic's view quantity under certain special needs, but does not know how to operate, this article introduces one kind of method which modifies the topic view quantity through a simple file; Create a file, such as: threadviews.php Write the following code Here is the post you want to edit tid, change to the one you want t

Views in Python3.1

Views in Python3.1 In Python3, the role of Views is similar to the role of Views in a database, which can reflect the changes of corresponding objects. After the database table changes, the View query results are the same as the changed values. The same is true for the values queried through Views in python. In Python

iOS Development > Learning-10 tips for accelerating table views development

English: David McGraw Translator: Cocoachina Translator yake_099 Website: http://www.cocoachina.com/ios/20150729/12795.html Click "Read original" To view this page Before we begin, I am prepared to listen to an opinion more than this year. Please take some time to give us some feedback through this brief survey. This will help me to help you.If you have ever dealt with CollectionView, you may have realized the value of this article. If you don't pay attention to the speed this w

Typecho blog post views Statistics plugin Stat

Typecho blog post views Stats plugin Stat This article to the Code Farm Introduction Typecho Blog Article views statistics plug-ins stat, need to code farmers can refer to. My new blog using the blog system is the Typecho blog system, the use of the time found that the blog system itself does not have the article browsing statistical functions, very unaccustomed. Search on the Internet after the discovery,

SQL Server indexed view with query overrides (materialized view) and indexed views

Often listen to the students of Oracle materialized view, one of the functions of materialized view is that you can implement query rewriting, it sounds like a tall feeling, SQL Server also has the function similar to Oracle materialized view, just called indexed view. To tell the truth, or materialized views sound more appropriate, compared to the normal view, materialized view is directly stored in the data in SQL Server indexed view also has the fu

Understanding of the concepts of indexes, views, triggers, stored procedures, cursors, etc. of the database

Tags: database index, views, triggers, stored procedures, cursors and other concepts of understandingUnderstanding of indexes, views, cursors, stored procedures, and triggersUnderstanding of indexes, views, cursors, stored procedures, and triggers1. Index1-1. Overview of the IndexWe combine a list of one or more columns in a table with the physical addresses reco

Understanding of the concepts of indexes, views, triggers, stored procedures, cursors, etc. of the database

Tags: database index, views, triggers, stored procedures, cursors and other concepts of understandingUnderstanding of indexes, views, cursors, stored procedures, and triggersUnderstanding of indexes, views, cursors, stored procedures, and triggers1. Index1-1. Overview of the IndexWe combine a list of one or more columns in a table with the physical addresses reco

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