What is a view what is it used for?

Question

A view is simply a structured query language (SQL) query stored as an object. A view allows the user to control the amount and specific criteria of the data they are pulling from a relational database. Under normal circumstances, every time this query is run, it has to be parsed and loaded into the SQL optimizer. 14 мар. 2022 г.

What are uses of view?

Views can join and simplify multiple tables into a single virtual table. Views can act as aggregated tables, where the database engine aggregates data (sum, average, etc.) and presents the calculated results as part of the data. Views can hide the complexity of data.

When should a view be used?

Views are acceptable when you want to restrict users to a particular subset of data. For instance, if you do not delete records but only mark the current one as active and the older versions as inactive, you want a view to use to select only the active records.

What is a view in a database?

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.

What is SQL view used for?

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.

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