Updating relational databases through views

This can cause the number of views that must be supported and maintained to continually expand until so many views exist that it is impossible to categorize their uses.There are seven primary uses for which views excel. Security One of the most beneficial purposes served by views is to extend the data security features of SQL Server.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.Views that use functions, specify DISTINCT, or utilize the GROUP BY clause may not be updated.These rules were developed over a number of years as a result of implementing large relational databases in many different environments.There may be more uses for views than are presented here, so do not needlessly fret if you do not see your favorite use for views covered in this article—unless you blindly use base table views.

As you read this article you will find that views are very useful when implemented wisely, but can be an administrative burden if implemented without planning.Furthermore, views are simple to create and implement.But unfortunately most users do not adhere to a systematic and logical approach to view creation.This is a requirement of the relational model and is referred to as relational closure.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.

Leave a Reply

  1. Sex cams deuchland 21-Dec-2017 09:28

    Vénus eut une grande influence sur la réussite de l'épopée d’Énée.

  2. Sexyvideochat italiane 05-Aug-2017 04:52

    The site also features the world's largest adult video chat room.

  3. free dating sites gold coast qld 26-Jun-2017 07:13

    Online Dating For Single Older Women & Younger Men in Dublin and Ireland.

  4. Nakedchats 23-Dec-2017 11:42

    Born on 16th July, 1984 – Kaif was born in Hong Kong to a Kashmiri father and an English mother. Saif was born on June 16th, 1970 and Soha on 4th October, 1978.

  5. free site on dating woman 08-Sep-2017 02:07

    Antonio wasn't shy about telling me how much he'd love to suck on my perky tits, and likewise, I wasn't shy about telling him how much I'd love a finger of his in my arse as I sucked his cock!

  6. dating agency maidstone 19-Nov-2017 20:22

    Die elektronische Veröffentlichung ohne Zugangsbeschränkungen von Forschungsergebnissen macht wissenschaftliche Informationen besser sichtbar, mit der positiven Konsequenz, dass diese häufiger zitiert werden.