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Each view should have a specific application or business requirement that it fulfills before it is created.That requirement should be documented somewhere, preferably in a data dictionary or repository.Almost any SQL that can be issued natively can be coded into a view; there are exceptions, however.For example, the UNION operator can not be used in a view and you cannot create a trigger on a view.All of the basic DDL statements can be used to create and manage views including CREATE, DROP, and ALTER.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).

There is no adequate rationale for enforcing a strict rule of one—view per base table for SQL Server application systems.Views that use functions, specify DISTINCT, or utilize the GROUP BY clause may not be updated.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.A view is basically the relational model's way of turning a SELECT statement into a "table" that is accessible using SQL. They can consist of any combination of the following: Views are defined using SQL and are represented internally to SQL Server by a SELECT statement, not by stored data.Therefore, a view can be considered a logical table. The SQL comprising the view is executed only when the view is accessed and views can be accessed by SQL in the same way that tables are — by SQL.Following them will result in a shop implementing views that are effective, minimize resource consumption, and have a stated, long-lasting purpose.

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