多选题In which three cases would you use the USING clause?（）AYou want to create a nonequijoin.BThe tables to be joined have multiple NULL columns.CThe tables to be joined have columns of the same name and different data types.DThe tables to be joined have co

第1题：

Which two statements are true regarding the USING clause in table joins?（）

• A、It can be used to join a maximum of three tables 
• B、It can be used to restrict the number of columns used in a NATURAL join 
• C、It can be used to access data from tables through equijoins as well as nonequijoins 
• D、It can be used to join tables that have columns with the same name and compatible data types

第2题：

Which three statements are true regarding subqueries?（）

• A、Subqueries can contain GROUP BY and ORDER BY clauses 
• B、Main query and subquery can get data from different tables 
• C、Main query and subquery must get data from the same tables 
• D、Subqueries can contain ORDER BY but not the GROUP BY clause 
• E、Only one column or expression can be compared between the main query and subquery
• F、 Multiple columns or expressions can be compared between the main query and subquery

第3题：

In which case would you use a FULL OUTER JOIN?（）

• A、Both tables have NULL values.
• B、You want all unmatched data from one table.
• C、You want all matched data from both tables.
• D、You want all unmatched data from both tables.
• E、One of the tables has more data than the other.
• F、You want all matched and unmatched data from only one table.

第4题：

What is necessary for your query on an existing view to execute successfully? （）

• A、The underlying tables must have data.
• B、You need SELECT privileges on the view.
• C、The underlying tables must be in the same schema.
• D、You need SELECT privileges only on the underlying tables.

第5题：

You are performing an incomplete recovery because some important tables have been dropped and purged from the Recycle Bin. Which clause can you NOT use to perform the incomplete recovery by using the RMAN utility？（）

• A、 UNTIL CANCEL
• B、 UNTIL SCN
• C、 UNTIL SEQUENCE
• D、 UNTIL TIME

第6题：

Which two statements are true regarding the USING and ON clauses in table joins?（）

• A、Both USING and ON clauses can be used for equijoins and nonequijoins 
• B、Amaximum of one pair of columns can be joined between two tables using the ON clause 
• C、The ON clause can be used to join tables on columns that have different names but compatible data types 
• D、The WHERE clause can be used to apply additional conditions in SELECT statements containing the ON or the USING clause 

第7题：

You create a Web Form that displays a GridView. The GridViews data source is a DataSet named dsOrders. The DataSet contains two DataTables named Orders and OrderDetails. You create a relation between the two DataTables using the following code segment. (Line numbers are included for reference only.)01 dtOrders = dsOrders.Tables[“Orders”]; 02 dtOrderDetails = dsOrders.Tables[“OrderDetail”]; 03 colParent = dtOrders.Columns[“OrderID”]; 04 colChild = dtOrderDetails.Columns[“ParentOrderID”]; 05 dsOrders.Relations.Add(“Rell”, colParent, colChild, false); You need to find the cause of the exception being raised in line 05. What should you do? （）

• A、Ensure that the child column and the parent column have the same names.
• B、Ensure that the child table and the parent table have the same names.
• C、Ensure that the child column and the parent column have the same data types.
• D、Ensure that each row in the child table has a corresponding row in the parent table.
• E、Ensure that the tables have an explicit relationship defined by a foreign key constraint in the database.

第8题：

You need to ensure that old data and current data can be queried according to the business requirements. What should you do?（）

• A、Specify a view based on the archival data table and current data tables.
• B、Specify that the data must be queried by using a stored procedure.
• C、Specify that both the archival data table and the current data tables must have indexes created on the same columns.
• D、Specify that a SQL Server Agent job must be used to copy current data into the archival data table each night.

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第13题：

In which of the following situations should correlation names be used?（）

• A、A table referenced in the FROM clause has no indexed column.
• B、The table referenced in the FROM clause has more than 200 columns.
• C、Two or more tables in the FROM clause have identical column names.
• D、The FROM clause contains two or more tables in the SELECT statement.

第14题：

You are using flat files as the data source for one of your data warehousing applications. To optimize the application performance， you plan to move the data from the flat files to clustered tables in an Oracle database.While migrating the data， you want to have minimal impact on the database performance and optimize the dataload operation.  Which method would you use to load data into the Oracle database（）

• A、Use the external table population.
• B、Use the Oracle Data Pump export and import utility.
• C、Use the conventional path data load of the SQL*Loader utility.
• D、Use the INSERT INTO...SELECT command to load the data

第15题：

Which three statements about subqueries are true? （）

• A、A main query can have more than one subquery.
• B、A subquery can have more than one main query.
• C、The subquery and main query must retrieve data from the same table.
• D、The subquery and main query can retrieve data from different tables.
• E、Only one column or expression can be compared between the subquery and main query.
• F、Multiple columns or expression can be compared between the subquery and main query.

第16题：

What are two reasons to create synonyms? （）

• A、You have too many tables.
• B、Your tables are too long.
• C、Your tables have difficult names.
• D、You want to work on your own tables.
• E、You want to use another schema's tables.
• F、You have too many columns in your tables.

第17题：

You are using flat files as the data source for one of your data warehousing applications. You plan to move the data from the flat file structures to an Oracle database to optimize the application performance. In your database you have clustered tables. While migrating the data， you want to have minimal impact on the database performance and optimize the data load operation. Which method would you use to load data into Oracle database？（）

• A、use the external table population
• B、use the Oracle Data Pump export and import utility
• C、use the conventional path data load of SQL*Loader utility
• D、use the direct path data load of Oracle export and import utility

第18题：

In which two cases would you use an outer join? （）

• A、The tables being joined have NOT NULL columns.
• B、The tables being joined have only matched data.
• C、The columns being joined have NULL values.
• D、The tables being joined have only unmatched data.
• E、The tables being joined have both matched and unmatched data.
• F、Only when the tables have a primary key/foreign key relationship.

第19题：

You design a Business Intelligence （BI） solution by using SQL Server 2008. You plan to create a SQL Server 2008 Reporting Services （SSRS） solution. Developers generate random reports against a data source that contains 200 tables. Power users generate random reports against four of the 200 tables. You need to design a strategy for the SSRS solution to meet the following requirements： ·Uses minimum amount of development effort. ·Provides two sets of tables in SSRS to the developers group and the power users group. Which strategy should you use？（）

• A、 Create two Report Builder models.Include the four frequently used tables in the first model and all the tables in the second model.
• B、 Create a Report Builder model by using all the tables.Create a perspective within the model to use only the four frequently used tables.
• C、 Create a Report Builder model by using all the tables. Create two folders.Place the four frequently used tables in the first folder and the remaining tables in the second folder.
• D、 Create two Data Source Views.Include all the tables in one Data Source View and the four frequently used tables in the other Data Source View.Create two Report Builder models so that each model uses one of the Data Source Views.

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