The triggers in views are covered later in this chapter.Another limitation of views that you may be familiar with is that a view cannot be indexed. In SQL Server 2000, you can indeed create indexed views, as shown later in this chapter.I have indexes on the target but will have to create index on the staging table now. I cannot delete the record as its used in fact table. Hi all I have a mysql table called vehicle_type and it has a column called cylinder_id The value in cylinder_id is a number that is defined by the value in the column cylinders.
As far as the user is concerned, the view looks just like a table.Views are saved SELECT statements that allow you to operate on the results that are returned from them.They can be used to provide row- or column-level access to data, to wrap up complex joins, to perform complex aggregate queries, and to otherwise customize the display of data. In this chapter, learn how to define, create, and modify views, and how to perform index analysis and optimize performance in SQL Server. The biggest problem is that just when you get used to accepting a limitation, Microsoft comes up with an amazing, new feature that overcomes it!Views give you a mechanism for presenting the same data to different users in different ways. As long as both the view and the Customers table are owned by dbo, the permissions granted on the view will take precedence over permissions removed from the Customers table. Because views allow you to restrict the rows and columns that are available, using them as a security tool is very convenient.Columns and rows can be restricted, allowing users to focus on specific data that interests them. This also helps network performance because less data is traveling over the wire to client applications. For example, you could create two views on an Employees table, one with a sensitive salary column included that only managers had permissions on, and a second view with that column omitted for everyone else.Tables can be customized and tailored to the needs of the users by way of views. All permissions can be removed from the underlying tables, and as long as the owner of the table is the same as the owner of the view, the user will be able to interact with the data based on the permissions granted to the view.