Besides the standard role of basic user-defined views, SQL Server provides the following types of views that serve special purposes in a database.Indexed viewsAn indexed view is a materialized view. This means the view definition has been computed and the resulting data stored just like a ...
The data access property of a user-defined function must be NO SQL, and external access property must be NO. Common language runtime (CLR) functions can appear in the select list of the view, but can't be part of the definition of the clustered index key. CLR functions can't appear ...
Just like in sub queries, you can't useORDER BYin a view definition in sql serverunless you also useTOP. The reason for this is that Views are acted upon as if they where tables, and tables in sql server (in fact, in any relational database) are considered as not ordered sets. Jus...
VIEWs have storage overhead, and whenever a base table used by a VIEW definition is changed, then all those VIEWs have to be recompiled and checked. They can also be used to ensure optimal access paths. By coding efficient predicates in the VIEW definition SQL, efficient access to the ...
Oracle Database stores a view definition in the data dictionary as the text of the query that defines the view. When you reference a view in a SQL statement, Oracle Database performs the following tasks: Merges a query (whenever possible) against a view with the queries that define the vie...
VIEW definitionTo see the definition (underlying query) of a view, you can use:\d+ [view name] Updating ViewsViews can be updated by using the following syntax:UPDATE [Name of View] SET [Column Name]=[Value to set to], [Column Name]=[Value to set to], etc WHERE [condition]; ...
TheALTER VIEWsyntax was introduced in SQL Server 7.0. In prior versions of SQL Server, you had to drop a view and then re-create it. The advantage ofALTER VIEWis that only the definition of the view is changed. If the view was dropped and re-created, a new object ID would be genera...
has_opaque_metadatabit1 = VIEW_METADATA option specified for view. For more information, seeCREATE VIEW (Transact-SQL). has_unchecked_assembly_databit1 = View contains persisted data that depends on an assembly whose definition changed during the last ALTER ASSEMBLY. Resets to 0 after the next...
Returns: the first stage of the new View definition.delete public abstract void delete(String viewName) The operation to delete a view. Parameters: viewName - View name. deleteById public abstract void deleteById(String id) The operation to delete a view. Parameters: id - the resource ID. ...
as an INFORMATION_SCHEMA type of view. We have the KEY_COLUMN_USAGE view and REFERENTIAL_CONSTRAINTS view, but what we really need is a REFERENTIAL_CONSTRAINTS_COLUMN_USAGE view, one that would show at a glance the columns used by FK constraints. The following view definition will do the jo...