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view vs table in sql server
Posted on 2011-03-08
i am using query from C# to sql server. my question is, i can get data from the views as well as tables. which one is better for performence for query? which one is better to use for select query?
please help
please help
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4 Comments
Active 3 days ago
It depends what it is a View of. If it is just a subset of a single table then the View will be as quick as the table. Views can be indexed so Views that draw data from multiple tables can be quicker than the same query run inline because the view can be indexed independently of the underlying tables.
Active 4 days ago
A view by general definition is a virtual table as it selects with more or less complex SQL from one or more real tables. From that perspective you can do both.
A view has the advantage to keep the knowledge about the queries at the database level. You can argue, that the business logic level of the c# application is also a good place for that, but the view can of course be used by many applications connecting to the same database.
Doing stored procedures instead of views could even be a better choice for keeping cahed meta data like the execution plan.
What you can't do is update a view, so you'd need to write changes to the underlying tables.
Pros and cons mainly are about abstraction layers of the application business logic and database/persitence layer. See here for further discussion: http://stackoverflow.com/questions/1004974/use-sql-view-or-sql-query
Bye, Olaf.
A view has the advantage to keep the knowledge about the queries at the database level. You can argue, that the business logic level of the c# application is also a good place for that, but the view can of course be used by many applications connecting to the same database.
Doing stored procedures instead of views could even be a better choice for keeping cahed meta data like the execution plan.
What you can't do is update a view, so you'd need to write changes to the underlying tables.
Pros and cons mainly are about abstraction layers of the application business logic and database/persitence layer. See here for further discussion: http://stackoverflow.com/questions/1004974/use-sql-view-or-sql-query
Bye, Olaf.
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