SQL Server 2000 Stored Procedure & XML Programming in .NET framework

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SQL Server 2000 Stored Procedure & XML Programming
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Design View in Enterprise Manager
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When a query is complicated, it is sometimes easier to create it in the Design View window of Enterprise Manager (see Figure 8-11). You can launch it from the context-sensitive menu of the View node in Enterprise Manger. It consists of four components: the Diagram pane (for managing tables visually), the Grid pane (for managing columns), the SQL pane (for editing SQL statements), and the Results pane (for displaying and editing data). This window is used in a manner similar to the Query Design window in Microsoft Access or Visual Studio, so I will not spend more time describing it here.
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Typically, a user does not need permissions on underlying base tables and views when the user has permission to access a view. There are two exceptions SQL Server checks permissions if all underlying tables and views do not belong to the same database, or when base objects belong to different owners.
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Standard SQL Views in Execution Plans
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It is a common misconception that SQL Server creates, stores, and reuses an execution plan of a view. The idea behind this wishful thinking is that SQL Server would optimize the execution plan of the view, so when it is referenced from a stored procedure or a query,
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Figure 8-11
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Design View window
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C h a p t e r 8 : S p e c i a l Ty p e s o f P r o c e d u r e s
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SQL Server would just include it in the execution plan of the caller. Although this might sound like a good idea (time would be saved since recompilation would not be necessary and since the optimal plan will be used), SQL Server has a better solution. There is another common misconception about view execution. Although I used the phrase virtual table to describe views, SQL Server does not execute the view, create a result set in memory, and then process the rest of the query. When a SQL view is referenced with other tables in a query, SQL Server compiles everything again and creates a new optimal execution plan. Other elements of the query (joins with other tables, additional criteria, and the list of required columns) typically change the nature of the query significantly so that a new execution plan works better than simply reusing the execution plan of a view.
NOTE
Execution plans of other types of views are constructed differently, and I will discuss them Indexed Views in Execution Plans and Execution Plans of Distributed Partitioned Views, later in this chapter.
Limitations of Views
Keep in mind that views have the following limitations: A view can contain up to 1024 columns. A view can be based on tables and other views, but not on temporary tables or table variables. It is possible to have only 32 levels of nested views. The Select statement in a view cannot have an Into clause (it cannot create a new table as a side effect). A view cannot have Compute and Compute By clauses. Only Instead-of triggers can be created on a view (not After triggers). An Order By clause can be used in the view only together with a Top clause. The last statement points to a very cool workaround if you need to order the results in a view the attempt to create a view using just the Order By clause will result in a syntax error:
Server: Msg 1033, Level 15, State 1, Procedure vInventory_Ordered, Line 25 The ORDER BY clause is invalid in views, inline functions, derived tables, and subqueries, unless TOP is also specified.
SQL Server 2000 Stored Procedure & XML Programming
To solve this problem, add Top 100 Percent to it:
Create VIEW dbo.vInventory_Ordered AS SELECT TOP 100 PERCENT dbo.Inventory.Inventoryid, dbo.Equipment.Make, dbo.Equipment.Model FROM dbo.Equipment RIGHT OUTER JOIN dbo.Inventory ON dbo.Equipment.EquipmentId = dbo.Inventory.EquipmentId order by dbo.Equipment.Make, dbo.Equipment.Model
Editing Data Using Views
It is possible to modify data in base tables through a view:
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