Before You Begin in .NET

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Before You Begin
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The end result of this process was a database that contained only 34 views. The only views that survived contained complex calculations or complex joins that needed to be encapsulated either to ensure consistency or to avoid a significant amount of effort in correctly constructing the query in the future. The lesson learned by the developers was that SQL Server gives you a lot of tools to accomplish a task. But just because you can do something doesn t necessarily mean that you should. Before creating an object in a database, you have to understand how it will improve the application and be able to justify why creating the object is the best approach.
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Implementing Views
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Lesson 1: Creating a View
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Certain SQL Server objects are necessary or generally recommended. For example, you must have database tables to store data, and you should create certain indexes on your tables to improve performance. However, you should create views only when there is a clear advantage to having them. Views that don t have demonstrated benefits just take up space. Suppose that you need to return the name of a customer who has a credit line in excess of $10,000. A view would provide no advantage in this case because the SELECT statement to generate this result is simple and straightforward. However, if you need to return the name of a customer with the primary address and most recent payment, while keeping in the output all of the customers who have not made a payment, creating a view is probably useful because generating this result requires a combination of inner and outer joins to at least five different tables. In this lesson, you see how to define a view over one or more tables. You also learn why it is important to ensure that you have appropriate permissions assigned for the view and any underlying tables the view is based on.
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After this lesson, you will be able to:
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Create a view. Assign permissions to a role or schema for a view.
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Estimated lesson time: 20 minutes
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How to Create a View
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You use the Transact-SQL CREATE VIEW command to create a view over one or more tables. The syntax for the command follows:
CREATE VIEW [ schema_name . ] view_name [ (column [ ,...n ] ) ] [ WITH <view_attribute> [ ,...n ] ] AS select_statement [ ; ] [ WITH CHECK OPTION ] <view_attribute> ::= { [ ENCRYPTION ] [ SCHEMABINDING ] [ VIEW_METADATA ]
You begin by naming your view. As with all objects, a view must have a name that meets the rules for identifiers.
Lesson 1: Creating a View
The command s first WITH clause lets you apply three different options to the view: ENCRYPTION, SCHEMABINDING, and VIEW_METADATA. ENCRYPTION specifies that SQL Server should encrypt the definition of the view when it is stored in the database. The definition of an encrypted view is not visible to anyone, including a member of the sysadmin fixed server role. So when you encrypt a view, you must ensure that you keep the original source code somewhere because you cannot decrypt the definition. When you specify the SCHEMABINDING option, you cannot drop any tables, views, or functions referenced by the view without first dropping the view.
BEST PRACTICES
Schema binding trick
An old trick that many DBAs use in a production environment is to create a view for each table that selects all columns in the table and specifies the SCHEMABINDING option. These views are never used with any application or by any user. The only purpose of the views is to prevent a DBA from accidentally dropping a table or a column within a table. This trick does not prevent a DBA from purposefully dropping a table because the DBA can also drop the view and then drop the table. But dropping an object on purpose that should not be dropped is a security issue.
The VIEW_METADATA option returns metadata about a view to client-side data access libraries. You use the command s AS clause to specify the SELECT statement that defines the view. The SELECT statement can be of any complexity as long as the query is valid and can reference tables, views, user-defined functions (UDFs), and system functions. The only restrictions are that the view s SELECT statement CANNOT do the following:
Use the COMPUTE or COMPUTE BY clause Use the INTO keyword Use the OPTION clause Reference a temporary table or table variable Use the ORDER BY clause unless it also specifies the TOP operator
The command s last option, WITH CHECK OPTION, is something you use to create an updateable view. Lesson 2, Modifying Data Through Views, covers this option. After you have created a view, you can use it just like any table in a database. However, a view does NOT contain any data. A view is simply a SELECT statement that has a name associated with it. So when a view is referenced in a SELECT statement, the query optimizer substitutes the reference with the definition of the view in the SELECT statement before generating an execution plan.
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