Asked by: Eleuteria Olivar
technology and computing databases

What is the difference between view and table?

34
The difference between a view and atable is that views are definitions built on top of othertables (or views), and do not hold data themselves. If data ischanging in the underlying table, the same change isreflected in the view. A view can be built on top ofa single table or multiple tables.


Furthermore, is view better than table?

A table contains data, a view is just aSELECT statement which has been saved in the database (moreor less, depending on your database). The advantage of aview is that it can join data from several tablesthus creating a new view of it.

Similarly, can we update a view? Restrictions on Updating Data Through Views. Ifthe view contains joins between multiple tables, youcan only insert and update one table in the view,and you can't delete rows. You can't directly modifydata in views based on union queries. You can't modify datain views that use GROUP BY or DISTINCT statements.

Furthermore, what is a view in a table?

In SQL, a view is a virtual table based onthe result-set of an SQL statement. A view contains rows andcolumns, just like a real table. The fields in a vieware fields from one or more real tables in thedatabase.

What are the advantages of views in SQL?

The following are advantages of using databaseviews.

  • A database view allows you to simplify complex queries: adatabase view is defined by an SQL statement that associates withmany underlying tables.
  • A database view helps limit data access to specific users.
  • A database view provides extra security layer.

Related Question Answers

Marce Alvarez De Arcaya

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What are the types of views in SQL?

There are 2 types of Views in SQL: Simple Viewand Complex View. Simple views can only contain a singlebase table. Complex views can be constructed on more thanone base table. In particular, complex views can contain:join conditions, a group by clause, a order by clause.

Ahtisham Valdueza

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What is a view in SAP?

SAP ABAP - Views. A view is created bycombining the data of one or more tables containing informationabout an application object. Using views, you can represent asubset of the data contained in a table or you can join multipletables into a single virtual table.

Ferdaous Lanari

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What is foreign key in database?

A foreign key is a column or group of columns ina relational database table that provides a link betweendata in two tables. It acts as a cross-reference between tablesbecause it references the primary key of another table,thereby establishing a link between them.

Alcor Landero

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Are views more efficient than queries?

Views make queries faster to write, butthey don't improve the underlying query performance. Inshort, if an indexed view can satisfy a query, thenunder certain circumstances, this can drastically reduce the amountof work that SQL Server needs to do to return the required data,and so improve query performance.

Saqib Hannesschlager

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What schema means?

The term "schema" refers to the organization ofdata as a blueprint of how the database is constructed (dividedinto database tables in the case of relational databases). Theformal definition of a database schema is a set offormulas (sentences) called integrity constraints imposed on adatabase.

Laudino Canatario

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Can we create view on view?

A view can contain all rows of a table or selectrows from a table. A view can be created fromone or many tables which depends on the written SQL query tocreate a view.

Miguela Ildefonso

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What is a DB View?

A database view is a searchable object in adatabase that is defined by a query. Though a view doesn'tstore data, some refer to a views as “virtual tables,”you can query a view like you can a table. A view cancombine data from two or more table, using joins, and also justcontain a subset of information.

Abdenbi Koncke

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What is schema in SQL?

A schema is a collection of database objects (asfar as this hour is concerned—tables) associated with oneparticular database username. You may have one or multipleschemas in a database. The user is only associated with theschema of the same name and often the terms will be usedinterchangeably.

Synthia Toktahunov

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What are the benefits of using queries?

Queries can accomplish a few different tasks.Primarily, queries are used to find specific data byfiltering specific criteria. Queries can also calculate orsummarize data, as well as automate data management tasks. Otherqueries include parameter, totals, crosstab, make table,append, update and delete.

Esperança Truchet

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Can we update view in SQL?

If the view contains joins between multipletables, you can only insert and update one table inthe view, and you can't delete rows. You can'tdirectly modify data in views based on union queries. Youcan't modify data in views that use GROUP BY orDISTINCT statements.

Kaylene Pedro

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Why trigger is used in SQL?

A trigger cannot be called or executed; the DBMSautomatically fires the trigger as a result of a datamodification to the associated table. Triggers areused to maintain the referential integrity of data bychanging the data in a systematic fashion. In addition,triggers can also execute stored procedures.

Selva Awertchenko

Teacher

What is the difference between view and temporary table?

1 Answer. The main difference between temporarytables and views is that temporary tables arejust the tables in tempdb, but views are just storedqueries for existing data in existing tables. Buttemporary table needs to be populated first, and populationis the main preformance-concerned issue.

Asis Villullas

Teacher

What is the difference between View and materialized view?

The basic difference between View and MaterializedView is that Views are not stored physically on thedisk. However, Materialized View is a physical copy, pictureor snapshot of the base table. A view is always updated asthe query creating View executes each time the Viewis used.

Abdelkhaleq Zannoni

Teacher

What is difference between temp and table variable?

Whereas, a Temporary table (#temp) iscreated in the tempdb database. So table variable isfaster then temporary table. ⇒ Temporary tablesare allowed CREATE INDEXes whereas, Table variables aren'tallowed CREATE INDEX instead they can have index by using PrimaryKey or Unique Constraint.

Rouchdi Ndebeka

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What is SQL Indexing?

SQL - Indexes. Advertisements.Indexes are special lookup tables that the database searchengine can use to speed up data retrieval. Simply put, anindex is a pointer to data in a table. An index in adatabase is very similar to an index in the back of abook.

Clarinda Bollain

Reviewer

How do I view tables in MySQL?

To see all the tables in the db.mysql> show tables; To see table's fieldformats. mysql> describe [tablename];

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EveryThingWhat Staff Editor

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12th April, 2020

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