What is views in SQL with example?

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.

What is view explain with example?

View is one of the database objects in SQL. It logically represents subsets of data from one or more table. We can presents logical subset of data by creating views of tables. A view is a logical table based on table or another view. A view is a window of table .

How do you write a view in SQL?

SQL Server CREATE VIEW

  1. First, specify the name of the view after the CREATE VIEW keywords. The schema_name is the name of the schema to which the view belongs.
  2. Second, specify a SELECT statement ( select_statement ) that defines the view after the AS keyword. The SELECT statement can refer to one or more tables.

Can we query on views?

A view is nothing more than a SQL statement that is stored in the database with an associated name. A view is actually a composition of a table in the form of a predefined SQL query. A view can contain all rows of a table or select rows from a table.

Why view is used in SQL?

Views can be used as a security mechanism A view can select certain columns and/or rows from a table (or tables), and permissions set on the view instead of the underlying tables. This allows surfacing only the data that a user needs to see.

What are types of views in SQL?

There are three types of System defined views, Information Schema, Catalog View, and Dynamic Management View.

What is difference between view and table?

A table is structured with columns and rows, while a view is a virtual table extracted from a database. The table is an independent data object while views are usually depending on the table. The table is an actual or real table that exists in physical locations.

Can we update view in SQL?

yes we can insert,update and delete view in sql server. View is the virtual table, yes we can.

What are the uses of view?

Views are used for security purposes because they provide encapsulation of the name of the table. Data is in the virtual table, not stored permanently. Views display only selected data. We can also use Sql Join s in the Select statement in deriving the data for the view.

Can we insert data into view?

We cannot insert or update data using view. The view is a virtual table. We can do those action, but it’s effect on real table data too. View is like a virtual table which enable us to get information of multiple tables.

Is view faster than table?

reading from a view allows the SQL to be rewritten.. and it’s generally FASTER to read from a view (than from a dump of the view).