70-442GB2312 braindumps materials
70-442GB2312 Braindumps Description
Exam Number/Code: 70-442GB2312
Questions and Answers:91 Q&As
Updated: 2009-09-15
Exam Name: PRO:Design & Optimize Data Access by Using MS SQL Serv 2005
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Exam : Microsoft 70-442GB2312
Title : PRO:Design & Optimize Data Access by Using MS SQL Serv 2005
1. 您是公司的数据库开发人员。您负责在公司新的 SQL Server 2005 计算机上将名为 DB1 和 DB2 的两个现有 SQL Server 2000 数据库合并为一个名为 NewDB 的数据库。
以下查询在用于访问 DB1 数据库的旧应用程序中可以正常工作。
SELECT * FROM Customer WHERE FaxNumber = NULL
但是,该查询在新的 SQL Server 2005 计算机上运行时将不会返回任何行,即使 FaxNumber 列中存在 NULL 值。
您需要解决该问题,以使该查询在 SQL Server 2005 计算机上能正常工作。您需要确保您的解决方案不会影响 DB2 中表和查询的行为。
您应该怎么办?
A. 使用 ISNULL 函数,而不是 = NULL。
B. 将 = NULL 更改为 IS NULL。
C. 将 = NULL 更改为 = ‘NULL’。
D. 在查询前面添加以下命令:SET ANSI_NULLS ON
E. 使用 ALTER DATABASE 命令将 ANSI_NULLS 数据库选项更改为 ON。
Answer: B
2. 您是公司的数据库开发人员。在您的数据库中,Employees 表包含大约 1,000 行,Orders 表包含数百万行。
Employees 表设计为如下所示。
EmployeeID (PK)
Firstname
Lastname
…
int
nvarchar(30)
nvarchar(30)
…
Orders 表设计为如下所示。
OrderID (PK)
SoldByEmployeeID (FK)
OrderDate
…
int
int
datetime
…
您需要编写一个查询,该查询返回每位员工所下的订单数。
您应该使用哪个查询?
A. SELECT e.Firstname, e.Lastname, COUNT(*)
FROM Employees AS e
LEFT OUTER JOIN Orders AS o
ON o.SoldByEmployeeID = e.EmployeeID
GROUP BY e.Firstname, e.Lastname
B. SELECT e.Firstname, e.Lastname, COUNT(*)
FROM Employees AS e
LEFT OUTER JOIN Orders AS o
ON o.SoldByEmployeeID = e.EmployeeID
GROUP BY e.EmployeeID, e.Firstname, e.Lastname
C. SELECT e.Firstname, e.Lastname, COUNT(o.OrderID)
FROM Employees AS e
LEFT OUTER JOIN Orders AS o
ON o.SoldByEmployeeID = e.EmployeeID
GROUP BY e.EmployeeID, e.Firstname, e.Lastname
D. SELECT e.Firstname, e.Lastname, COUNT(o.OrderID)
FROM Employees AS e
LEFT OUTER JOIN Orders AS o
ON o.SoldByEmployeeID = e.EmployeeID
GROUP BY e.Firstname, e.Lastname
Answer: C
3. 您是公司的数据库开发人员。一个名为 Articles 的表包含报纸文章,其设计如下所示。
ArticleID (PK)
Title
ArticleXml
CategoryID (FK)
int
nvarchar(50)
xml
int
ArticleXml 列中的 XML 文档如下所示。
<article>
<paragraph>…</paragraph>
<image>…</image>
…
<image>…</image>
…
</article>您需要设计一个查询,该查询将按照 CategoryID 值显示图像的总数。
您应该使用哪个查询?
A. SELECT
CategoryID
,COUNT(ArticleXml.value(’count(/article/image)’,
‘INT’)) AS NumberOfImages
FROM Articles
GROUP BY CategoryID;
B. SELECT
CategoryID
,COUNT(ArticleXml.exist(’/article/image’)
AS NumberOfImages
FROM Articles
GROUP BY CategoryID;
C. SELECT
CategoryID
,SUM(ArticleXml.value(’count(/article/image)’, ‘INT’))
AS NumberOfImages
FROM Articles
GROUP BY CategoryID;
D. SELECT
CategoryID
,SUM(ArticleXml.exist(’/article/image’)
AS NumberOfImages
FROM Articles
GROUP BY CategoryID;
Answer: C
4. 您是公司的数据库开发人员。有一个将订单项保存到 OrderItems 表的过程。如果该项不存在,则应执行插入。如果该项存在,则应执行更新。OrderItems 表设计为如下所示。
OrderID (PK, FK)
ProductID (PK, FK)
Quantity
int
int
int
您需要开发一个使用最少量资源的例程。
您应该使用哪个例程?
A. BEGIN TRY
UPDATE OrderItems SET Quantity = @Quantity
WHERE OrderID = @OrderID
AND ProductID = @ProductID;
END TRY
BEGIN CATCH
INSERT OrderItems (OrderID, ProductID, Quantity)
VALUES (@OrderID, @ProductID, @Quantity);
END CATCH
B. IF EXISTS (SELECT * FROM OrderItems
WHERE OrderID = @OrderID
AND ProductID = @ProductID
)
UPDATE OrderItems SET Quantity = @Quantity
WHERE OrderID = @OrderID
AND ProductID = @ProductID;
ELSE
INSERT OrderItems (OrderID, ProductID, Quantity)
VALUES (@OrderID, @ProductID, @Quantity);
C. IF NOT EXISTS (SELECT * FROM OrderItems
WHERE OrderID = @OrderID
AND ProductID = @ProductID
)
INSERT OrderItems (OrderID, ProductID, Quantity)
VALUES (@OrderID, @ProductID, @Quantity);
ELSE
UPDATE OrderItems SET Quantity = @Quantity
WHERE OrderID = @OrderID
AND ProductID = @ProductID;
D. UPDATE OrderItems SET Quantity = @Quantity
WHERE OrderID = @OrderID AND ProductID = @ProductID;
IF(@@ROWCOUNT = 0)
INSERT OrderItems (OrderID, ProductID, Quantity)
VALUES (@OrderID, @ProductID, @Quantity);
Answer: D
5. 您是公司的数据库开发人员。现必须优化 Stockholm 市订单的处理例程,以获得更好的性能。
当前例程如以下代码段所示。
…
DECLARE OrderCursor CURSOR FOR
SELECT OrderID, City, CustomerID FROM Orders;
OPEN OrderCursor;
FETCH NEXT FROM OrderCursor INTO @OrderID, @CustomerID, @City;
WHILE(@@FETCH_STATUS = 0)
BEGIN
IF(@City <> ‘Stockholm’)
GOTO Next;
<Code for processing order>
Next:
FETCH NEXT FROM OrderCursor INTO
@OrderID, @CustomerID, @City;
END
…
您需要优化该例程以获得最佳性能。
您应该怎么办?
A. 将游标更改为以 DYNAMIC 形式声明。
B. 将游标更改为以 KEYSET 形式声明。
C. 将游标更改为以 STATIC 形式声明。
D. 更改游标中的 SELECT 语句以包括 WHERE City = ‘Stockholm’。
E. 将 IF 语句更改为检查 @City = ‘Stockholm’,从而避免使用 GOTO 语句。
Answer: D
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