单项选择题 你打算从SQL Server 2000数据库的客户表和国别表中导入客户数据到SQL Server 2005数据库中。你要确保在导入过程中，客户表中国家代码列的每个值在SQL Server 2005数据库中国别表内都有其相应的纪录。你在两个表之间定义一外键，这样，参照完整性将保证若国家代码值在客户表中存在，而在国别表中不存在时导入程序失败。你要确保国别表无记录时导入过程不失败，该怎么做？（）

单项选择题 You are planning to import customer data from the Customer table and the Country table in your SQL Server 2000 database into a SQL Server 2005 database. You want to ensure that during the import process，each value in the CountryCode column of the Customer table has a corresponding record in the CountryCode column in the Country table of the SQL Server 2005 database. You define a foreign key between these two tables. Thus，referential integrity will guarantee that the import routine fails if there are any records where a CountryCode value does not exist in the Country table but does exist in the Customer table. You need to ensure that the import process does not fail if records are encountered that do not exist in the Country table. What should you do？（）

单项选择题 You work with a SQL Server 2005 database that provides banking information for customers. You want customers to see banking reports that combine data that is retrieved from the database with real-time investment information that comes from a Web service provided by a third party. The investment information must be current when the reports are executed. You need to create the appropriate objects that support the reports. What should you do？（）