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Rahul Roi

Rahul Roi

03-Nov-2020

If we are discussion about the role of views in SQL server then founded that it is kind of virtual tables.

A view has also some rows and columns as they are in a real table in the database.

We can also create a view by selecting fields from one or more tables present in the database.

Where a view can either have all the rows of a table or specific rows based on certain condition.

And where the VIEW in SQL is a logical subset of data from one or more tables. And mostly, the view is used to restrict data access.

  • The role of Views is - It can be represent a subset of the data contained in a table; with the result that a view can limit the degree of unveiling of the underlying tables to the outer world.
  • When the listed users may have permission to query the view, And while denied access to the rest of the base table.
  • And A views can join and simplify multiple tables into a single virtual table.
  • A views can enactment as aggregated tables, where the database engine aggregates data (sum, average, etc.) and presents the calculated results as part of the data
  • Where a view can hide the complexity of data; for the example, the view could appear as Sales1001 or Sales2001, transparently partitioning the actual underlying table
  • In the views, It takes a very little space to store the data in SQL server; And the database contains only the definition of a view, not a copy of all the data which it presents.
  • The Views may provide additional security, depending on the SQL engine used.
Syntax for creating a View,

CREATE or REPLACE VIEW view_name 

    AS

    SELECT column_name(s)

    FROM table_name

    WHERE condition

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