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最新的 MCSA 070-457 免費考試真題:

1. You develop a Microsoft SQL Server 2012 database. You create a view that performs the following tasks:
Joins 8 tables that contain up to 500,000 records each.
Performs aggregations on 5 fields.
The view is frequently used in several reports. You need to improve the performance of the reports.
What should you do?

A) Convert the view into a table-valued function.
B) Convert the view into a Common Table Expression (CTE).
C) Convert the view into a stored procedure and retrieve the result from the stored procedure into a temporary table.
D) Convert the view into an indexed view.

2. You have a database that contains the tables shown in the exhibit. (Click the Exhibit button.)

You need to create a query that calculates the total sales of each OrderId from the Sales.Details table. The solution must meet the following requirements:
Use one-part names to reference columns.
Sort the order of the results from OrderId.
NOT depend on the default schema of a user.
Use an alias of TotalSales for the calculated ExtendedAmount.
Display only the OrderId column and the calculated TotalSales column.
Which code segment should you use?
To answer, type the correct code in the answer area.

A) SELECT OrderID, SUM(ExtendedAmount) AS TotalSales FROM Sales.Details GROUP BY OrderID ORDER BY OrderID
B) SELECT OrderID, SUM(ExtendedAmount) AS TotalSales FROM Sales.Details ORDER BY OrderID

3. You develop a Microsoft SQL Server 2012 database that has two tables named SavingAccounts and LoanAccounts. Both tables have a column named AccountNumber of the nvarchar data type. You use a third table named Transactions that has columns named TransactionId, AccountNumber, Amount, and TransactionDate. You need to ensure that when multiple records are inserted in the Transactions table, only the records that have a valid AccountNumber in the SavingAccounts or LoanAccounts are inserted. Which Transact-SQL statement should you use?

A) CREATE TRIGGER TrgValidateAccountNumber ON Transactions INSTEAD OF INSERT AS BEGIN
INSERT INTO Transactions SELECT TransactionID,AccountNumber,Amount,TransactionDate FROM inserted WHERE AccountNumber IN (SELECT AccountNumber FROM LoanAccounts UNION SELECT AccountNumber FROM SavingAccounts)) END
B) CREATE TRIGGER TrgValidateAccountNumber ON Transactions INSTEAD OF INSERT AS BEGIN
IF EXISTS (
SELECT AccountNumber FROM inserted EXCEPT
(SELECT AccountNumber FROM LoanAccounts
UNION SELECT AccountNumber FROM SavingAccounts))
BEGIN
ROLLBACK TRAN
END
END
C) CREATE TRIGGER TrgValidateAccountNumber ON Transactions FOR INSERT AS BEGIN
INSERT INTO Transactions SELECT TransactionID,AccountNumber,Amount,TransactionDate FROM inserted WHERE AccountNumber IN (SELECT AccountNumber FROM LoanAccounts UNION SELECT AccountNumber FROM SavingAccounts)) END
D) CREATE TRIGGER TrgValidateAccountNumber ON Transactions FOR INSERT AS BEGIN
IF EXISTS (
SELECT AccountNumber FROM inserted EXCEPT
(SELECT AccountNumber FROM LoanAccounts
UNION SELECT AccountNumber FROM SavingAccounts))
BEGIN
ROLLBACK TRAN
END
END

4. You administer a Microsoft SQL Server 2012 database named ContosoDb. Tables are defined as shown in the exhibit. (Click the Exhibit button.)

You need to display rows from the Orders table for the Customers row having the CustomerId value set to 1 in the following XML format.

Which Transact-SQL query should you use?

A) SELECT OrderId, OrderDate, Amount, Name, Country FROM Orders INNER JOIN Customers ON Orders.CustomerId = Customers. CustomerId WHERE Customers.CustomerId = 1 FOR XML AUTO
B) SELECT Name, Country, OrderId, OrderDate, Amount FROM Orders INNER JOIN Customers ON Orders.CustomerId = Customers. CustomerId WHERE Customers.CustomerId = 1 FOR XML AUTO, ELEMENTS
C) SELECT Name AS '@Name', Country AS '@Country', OrderId, OrderDate, Amount FROM Orders INNER JOIN Customers ON Orders.CustomerId = Customers. CustomerId WHERE Customers.CustomerId = 1 FOR XML PATH ('Customers')
D) SELECT OrderId, OrderDate, Amount, Name, Country FROM Orders INNER JOIN Customers ON Orders.CustomerId = Customers. CustomerId WHERE Customers.CustomerId = 1 FOR XML AUTO, ELEMENTS
E) SELECT Name, Country, OrderId, OrderDate, Amount FROM Orders INNER JOIN Customers ON Orders.CustomerId = Customers.
CustomerId
WHERE Customers.CustomerId = 1
FOR XML AUTO
F) SELECT Name AS 'Customers/Name', Country AS 'Customers/Country', OrderId, OrderDate, Amount FROM Orders INNER JOIN Customers ON Orders.CustomerId = Customers. CustomerId WHERE Customers.CustomerId = 1 FOR XML PATH ('Customers')
G) SELECT OrderId, OrderDate, Amount, Name, Country FROM Orders INNER JOIN Customers ON Orders.CustomerId = Customers. CustomerId WHERE Customers.CustomerId = 1 FOR XML RAW, ELEMENTS
H) SELECT OrderId, OrderDate, Amount, Name, Country FROM Orders INNER JOIN Customers ON Orders.CustomerId = Customers. CustomerId WHERE Customers.CustomerId = 1 FOR XML RAW

5. You are developing a database application by using Microsoft SQL Server 2012. An application that uses a database begins to run slowly. Your investigation shows the root cause is a query against a read-only table that has a clustered index. The query returns the following six columns: * One column in its WHERE clause contained in a non-clustered index * Four additional columns * One COUNT (*) column based on a grouping of the four additional columns.
You need to optimize the statement. What should you do?

A) Include a SET FORCEPLAN ON statement before you run the query.
B) Include a SET STATISTICS SHOWPLAN_XML ON statement before you run the query.
C) Add a LOOP hint to the query.
D) Include a SET TRANSACTION ISOLATION LEVEL REPEATABLE READ statement before you run the query.
E) Include a SET TRANSACTION ISOLATION LEVEL SNAPSHOT statement before you run the query.
F) Add a HASH hint to the query.
G) Cover the unique clustered index with a columnstore index.
H) Add a columnstore index to cover the query.
I) Include a SET TRANSACTION ISOLATION LEVEL SERIALIZABLE statement before you run the query.
J) Add a FORCESEEK hint to the query.
K) Include a SET STATISTICS PROFILE ON statement before you run the query.
L) Add a FORCESCAN hint to the Attach query.
M) Enable the optimize for ad hoc workloads option.
N) Add an INCLUDE clause to the index.

問題與答案：