What is the difference between view and table in oracle

If yes, how? View is a database object and also views are used to we can store data from table. Feel free to comment, ask questions if you have any doubt. Pages Home core java spring online courses thread java 8 coding sql books oop interview certification free resources best.

The difference between View and Materialized view is one of the popular SQL interview questions, much like truncate vs delete , correlated vs noncorrelated subquery , or primary key vs unique key. Views are a concept which not every programmer is familiar with, it is simply not in the category of CRUD operation or database transactions or SELECT query, its little advanced concept for the average programmer.

Views allow a level of separation than an original table in terms of access rights but it always fetches updated data. What is Materialized View in a Database? Materialized views are also the logical view of our data-driven by the select query but the result of the query will get stored in the table or disk, also the definition of the query will also store in the database.

When we see the performance of Materialized view it is better than normal View because the data of materialized view will be stored in table and table may be indexed so faster for joining also joining is done at the time of materialized views refresh time so no need to every time fire joins statement as in case of view. See Oracle Database 12c Fundamentals , an online course from Pluralsight to learn more about how Oracle database stores Views.

I suggest always preparing this question in good detail and if you can get some hands-on practice like creating Views, getting data from Views then try that as well. Labels: database , sql , SQL interview Question. A database is a digital collection of organized data or information which can be stored in computer memory or other storage devices.

It was developed in such a way that large amounts of data can be stored and accessed by users. A database has several objects that save, display, and analyze large amounts of information. Microsoft SQL provides database objects such as stored procedures, users, functions, tables, and views. Tables hold data which are used in applications and reports. They are designed in rows, columns, and fields. They can only have a specific number of columns but can contain as many rows as possible.

Relational databases use several tables to store linked data and records. Data in tables may or may not be physically stored in the database. There are two types of tables, namely; object tables which use an object type to define a column and hold instances of a defined object, and a relational table which holds basic user data in a relational database. View, on the other hand, is a query used as a table which can be linked to another table. It is a list of several records in a table format that are used for data that are queried frequently.

In querying the names and addresses which are located at different tables, views can be used. It is a virtual table that is gathered from data in the database.

To change the data stored in the database would also change the data shown in the view. Its content is based on base tables. The view is a database object with no values and contains rows and columns the same as real tables. It does not occupy space on our systems. In this article, we have made a comparison between table and view that are two database objects.

A user cannot create a view without using tables because it depends on the table. JavaTpoint offers too many high quality services. Mail us on [email protected] , to get more information about given services. Please mail your requirement at [email protected] Duration: 1 week to 2 week.

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