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You can use constraints within a table s definition instead of the WITH CHECK OPTION in a view. If more than one view references the same table, using a constraint within a table s definition represents a more consistent technique for forcing inserts and updates to adhere to constraints.
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A view does not accept arguments at runtime. Therefore, you cannot change the result set that gets returned from a view by changing the value of a parameter. Other database objects, such as user-defined functions and stored procedures, offer this capability. There are three types of views, which are as follows: Standard views merely encapsulate a SELECT statement. You can place a complex SELECT statement in a view to make it easy to reuse. In addition to data access, standard views also support data modification. Indexed views work especially well when you want to aggregate many rows from multiple joined data sources. This type of view can deliver performance gains by creating a clustered index for the view. SELECT statements referencing data sources that change frequently because of new, deleted, or updated rows are not good candidates for indexed views. Partitioned views combine multiple tables via UNION operators from different storage devices on one computer or from different computers. This type of view can deliver performance benefits by scaling out across multiple servers or multiple storage devices on a single computer. This section illustrates several typical ways of creating and using standard views. The other two view types are specialized extensions of standard views that you are not likely to need in the overwhelming majority of your SQL Server Express applications.
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Performing Data Access with a View
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There are two steps for using a view to facilitate data access. 1. Create the view with a CREATE VIEW statement. 2. Perform the data access task by referencing the view in the FROM clause of a SELECT statement. When you create a view, you can create it in a custom schema for a database (such as the Sales schema in the AdventureWorks database), or as an object in a schema associated with a database user (such as the dbo user). The dbo user has a built-in schema with the same name as the user. A list of the built-in and custom schemas available for use in a database is available from the sys.schemas catalog view (SELECT * FROM sys.schemas) for a new database. The assignment of a view to the schema for the dbo user can be implicit. If you do not explicitly designate a named view in a CREATE VIEW statement or the FROM clause of a SELECT statement as
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CHAPTER 7 LEVERAGING DATABASE OBJECTS THAT ENCAPSULATE T-SQL
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belonging to a specific schema, such as Sales, then SQL Server Express creates or searches for a view in the dbo schema. These naming conventions allow you to have multiple versions of a view with the same name in different schemas. The samples for this section appear in ViewsForDataAccess.sql.
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The capability of having multiple view versions with the same name means that you should always designate a schema name for a view unless you explicitly mean to reference the default dbo schema.
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Creating and Using a View in the dbo Schema
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The following script shows the code for creating a view in the dbo schema. The IF statement uses the OBJECT_ID function to check if a view named vSalePersonNamePhoneEmail exists in the dbo schema. This function returns the identification number for an object in a database. If an object s identification number is NOT NULL, then the object exists. For this outcome (a non-null identification number), the code sample drops the view s current version. Without either dropping or archiving the current version, you would not be able to create a new version of vSalePersonNamePhoneEmail. The CREATE VIEW statement in the code sample shows a basic syntax for creating a new view. 1. Specify the name of the new view after the CREATE VIEW phrase. The code sample explicitly designates the dbo schema name even though SQL Server Express will automatically assign a view to this schema if you do not explicitly designate another schema. 2. Follow the view s name with the AS keyword. This keyword serves as a transition from the view s declaration with CREATE VIEW to the SELECT statement specifying the rowset associated with the view. It is possible, but not necessary, to use additional clauses before the AS keyword to modify the way a view is saved or performs. For example, a WITH ENCRYPTION clause encrypts the text for the SELECT statement defining a view. 3. The SELECT statement in the script that follows joins three tables to provide contact data, such as name parts, phone, and email address, for sales persons in the AdventureWorks database. IF OBJECT_ID('dbo.vSalePersonNamePhoneEmail', 'VIEW') IS NOT NULL DROP VIEW dbo.vSalePersonNamePhoneEmail GO CREATE VIEW dbo.vSalePersonNamePhoneEmail AS SELECT s.SalesPersonID, c.FirstName, c.MiddleName, c.LastName, c.Phone, c.EmailAddress FROM Sales.SalesPerson S JOIN HumanResources.Employee e ON s.SalesPersonID = e.EmployeeID JOIN Person.Contact c ON c.ContactID = e.ContactID GO Extracting data from a view is as simple as running a SELECT statement. The following SELECT statement returns all the columns, except for MiddleName, from the vSalePersonNamePhoneEmail view in the dbo schema. Notice that you do not need column prefixes to indicate the data source because all the columns derive from the vSalePersonNamePhoneEmail view. A filter restricts the return of rows to those whose LastName column value starts with A. You are not restricted to such simple SELECT statement designs. For example, you can perform grouping and ordering on result set rows.
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