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Which clause should you use to make data modifications visible through the view The WITH CHECK OPTION clause places a constraint on INSERT, UPDATE, DELETE, BCP, and BULK INSERT statements, so the operations can occur only on the set of rows that match the criteria in the view s WHERE clause.
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Create an Updateable View
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In this practice, you create a view that you can use to make changes to the Customer table for any customer who has a credit line greater than $1,000. 1. If necessary, launch SSMS, connect to your instance, open a new query window, and change the context to the database that contains the customer tables you created in 3. 2. Create a Customer view on the Customer table by executing the following statement:
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CREATE VIEW dbo.v_Customer AS SELECT CustomerID, CustomerName, CreditLine, AvailableCredit FROM dbo.Customer WHERE CreditLine > 1000 WITH CHECK OPTION;
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Lesson 2: Modifying Data Through Views
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3. Execute the following INSERT statement and observe the results:
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INSERT INTO dbo.Customer (CustomerName, CreditLine) VALUES('Customer1',5000);
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4. Execute the following INSERT statement and observe the results:
INSERT INTO dbo.v_Customer (CustomerName, CreditLine) VALUES('Customer2',300);
Lesson Summary
Although stored procedures are a better alternative for performing data modifications, you can use views to INSERT, UPDATE, DELETE, BCP, or BULK INSERT data. The view is used as a pass-through to apply the changes directly to a single base table. To constrain the changes to only the set of rows that match the view s WHERE clause, you use the WITH CHECK OPTION clause when creating the view.
Lesson Review
The following questions are intended to reinforce key information presented in this lesson. The questions are also available on the companion CD if you prefer to review them in electronic form.
NOTE
Answers
Answers to these questions and explanations of why each answer choice is right or wrong are located in the Answers section at the end of the book.
1. Which of the following options restricts changes to data to conform to the select criteria of a view A. SCHEMABINDING B. CHECK OPTION C. ANSI_NULLS D. QUOTED_IDENTIFIER
7
Implementing Views
Lesson 3: Creating an Indexed View
As you saw earlier in this chapter, when a query references a regular view, the query optimizer replaces the reference with the stored definition of the view before executing the SELECT statement. However, SQL Server still computes any joins or aggregations for the query at execution time. Indexed views provide a way to precalculate the result set a view returns. Using indexed views becomes valuable when the cost for SQL Server to constantly execute the query far outweighs the cost required to maintain the results of the SELECT statement in a view as data is modified. This lesson explains how to create an indexed view and some appropriate situations for indexed views.
After this lesson, you will be able to:
Create an indexed view.
Estimated lesson time: 20 minutes
Prerequisites for an Indexed View
In theory, creating an indexed view is simply a process of creating a view and then creating a clustered index on the view. In practice, the process is not so straightforward. To create an indexed view, the base tables for the view must meet many criteria. The view then has additional restrictions. Finally, the index has even more restrictions.
MORE INFO
Restrictions on creating an indexed view
For details about all the requirements and restrictions for creating an indexed view, see the SQL Server 2005 Books Online topic Creating Indexed Views.
The purpose of all these restrictions is to ensure that SQL Server can perform a consistent calculation. An indexed view, also called a materialized view, causes SQL Server to execute the SELECT statement in the view definition. SQL Server then builds a clustered index on the view s results, and stores the data and index within the database. As you change data in the base tables, SQL Server propagates these changes to the indexed view. If the result of the view could change from one execution to another or could change if different query options were set, the entire set of data SQL Server calculated and stored would be invalidated. Therefore, all the operators or functions that can cause varying results are disallowed.
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