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Posted by / 21-May-2016 18:17

Updating views in sql

Furthermore, views are simple to create and implement.But unfortunately most users do not adhere to a systematic and logical approach to view creation.View Overview Before discussing how best to implement views, let's review the basics of views.All operations on a SQL Server table result in another table. Mullins Views are a very useful feature of relational technology in general, and Microsoft SQL Server specifically.

No physical structure is required of a view; it is a representation of data that is stored in other tables. When modifying data through a view (that is, using INSERT or UPDATE statements) certain limitations exist depending upon the type of view.Additionally, inserting data is prohibited for the following types of views: It is also possible to insert or update data through a view such that the data is no longer accessible via that view, unless the WITH CHECK OPTION has been specified.Almost any SQL that can be issued natively can be coded into a view; there are exceptions, however.The text of any view can be retrieved from the SQL Server system catalog using the system procedure sp_helptext (unless the view was created specifying WITH ENCRYPTION).For example, this statement: sp_helptext Sample_view Might return the following output: It is also possible to rename a view using the system procedure sp_rename.

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The data "in the view" is not stored anywhere and only physically exists in the underlying tables. Views that access multiple tables can only modify one of the tables in the view.

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