In a database, a view is the result set of a stored query on the data , which the database users can query just as they would in a persistent database collection object. ... Views can join and simplify multiple tables into a single virtual table.
Do views automatically update in SQL?
A view is basically a stored query, it holds no data so no, it won’t get updated when the tables it’s built on are. However as soon as you reference the view the query it’s based on will run, so you will see the changes made to the base tables.
How does View work in SQL?
A VIEW in SQL Server is like a virtual table that contains data from one or multiple tables . It does not hold any data and does not exist physically in the database. Similar to a SQL table, the view name should be unique in a database. It contains a set of predefined SQL queries to fetch data from the database.
How do I query a view in SQL Server?
In Object Explorer, expand the database that contains the view to which you want to view the properties, and then expand the Views folder. Right-click the view of which you want to view the properties and select View Dependencies. Select Objects that depend on [view name] to display the objects that refer to the view.
What is an SQL view and why is it useful?
Views are virtual tables that can be a great way to optimize your database experience . Not only are views... Views are virtual tables that can be a great way to optimize your database experience.
Are views stored in database?
A view is a virtual table whose contents are defined by a query. Like a table, a view consists of a set of named columns and rows of data. Unless indexed, a view does not exist as a stored set of data values in a database.
What is the use of database view?
A database view is a subset of a database and is based on a query that runs on one or more database tables. Database views are saved in the database as named queries and can be used to save frequently used, complex queries . There are two types of database views: dynamic views and static views.
Are views updatable?
Update View
All views are not updatable . So, UPDATE command is not applicable to all views. An updatable view is one which allows performing a UPDATE command on itself without affecting any other table.
Can we insert update and delete a view?
Yes, possible to insert,update and delete to view. view is a virtual table. Same Perform as insert,update,delete query.. A view can be defined as a virtual table or a stored query and the data accessible through a view is not stored in the database as a distinct object.
How do you refresh in SQL?
With your focus in the Query window, press Ctrl+Shift+R . This will refresh your cache and now your query will be happy with you.
How do I view a SQL query?
- Go to your database.
- There’s a subnode Views.
- Find your view.
- Choose Script view as > Create To > New query window.
What is difference between view and table?
The main difference between view and table is that view is a virtual table based on the result set of an SQL statement , while the table is a database object which consists of rows and columns that store data of a database. In brief, a programmer cannot create views without using tables.
How do you write a trigger?
create trigger [trigger_name]: Creates or replaces an existing trigger with the trigger_name. [before | after]: This specifies when the trigger will be executed. {insert | update | delete}: This specifies the DML operation. on [table_name]: This specifies the name of the table associated with the trigger.
What is true view?
Explanation: VIEW is a virtual table , through which a selective portion of the data from one or more tables can be seen. A view do not contain data of their own.
What triggers SQL?
A SQL trigger is a database object which fires when an event occurs in a database . We can execute a SQL query that will “do something” in a database when a change occurs on a database table such as a record is inserted or updated or deleted. For example, a trigger can be set on a record insert in a database table.
Why use triggers in SQL?
Because a trigger resides in the database and anyone who has the required privilege can use it, a trigger lets you write a set of SQL statements that multiple applications can use . It lets you avoid redundant code when multiple programs need to perform the same database operation.
