Microsoft 70-461 study pdf

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Microsoft Querying Microsoft SQL Server 2012 70-461
Exam Number/Code : 70-461
Exam Name : Querying Microsoft SQL Server 2012
One year free update
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Questions and Answers : 88Q&As
Update Time : 2013-5-20
Price : $89.00

Exam 70-461 book: Querying Microsoft SQL Server 2012
Troubleshoot & Optimize (25%)
•Optimize queries.
◦May include but not limited to: understand statistics; read query plans; plan guides; DMVs; hints; statistics IO; dynamic vs. parameterized queries; describe the different join types (HASH, MERGE, LOOP) and describe the scenarios they would be used
•Manage transactions.
◦May include but not limited to: mark a transaction; understand begin tran, commit, and rollback; implicit vs explicit transactions; isolation levels; scope and type of locks; trancount
•Evaluate the use of row-based operations vs. set-based operations.
◦May include but not limited to: when to use cursors; impact of scalar UDFs; combine multiple DML operations
•Implement error handling.
◦May include but not limited to: implement try/catch/throw; use set based rather than row based logic; transaction management

Exam 70-461: Querying Microsoft SQL Server 2012
Create Database Objects (24%)
•Create and alter tables using T-SQL syntax (simple statements).
◦May include but not limited to: create tables without using the built in tools; ALTER; DROP; ALTER COLUMN; CREATE
•Create and alter views (simple statements).
◦May include but not limited to: create indexed views; create views without using the built in tools; CREATE, ALTER, DROP
•Design views.
◦May include but not limited to: ensure code non regression by keeping consistent signature for procedure, views and function (interfaces); security implications
•Create and modify constraints (simple statements).
◦May include but not limited to: create constraints on tables; define constraints; unique constraints; default constraints; primary and foreign key constraints
•Create and alter DML triggers.
◦May include but not limited to: inserted and deleted tables; nested triggers; types of triggers; update functions; handle multiple rows in a session; performance implications of triggers

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Question: 1
You create a table that has the StudentCode, SubjectCode, and Marks columns to record mid -year
marks for students. The table has marks obtained by 50 students for various subjects.
You need to ensure that the following requirements are met:
• Students must be ranked based on their average marks.
• If one or more students have the same average, the same rank must be given to these
students.
• Consecutive ranks must be skipped when the same rank is assigned.
Which Transact-SQL query should you use?
A. SELECT StudentCode as Code,
RANK ( ) OVER (ORDER BYAVG (Marks) DESC) AS Value FROM StudentMarks
GROUP BY StudentCode
B. SELECT Id, Name, Marks, DENSE_RANK () OVER (ORDER BY Marks DESC) AS Rank F ROM
StudentMarks
C. SELECT StudentCode as Code,
DENSE_RANK () OVER (ORDER BYAVG (Marks) DESC) AS Value FROM StudentMarks
GROUP BY StudentCode
D. SELECT StudentCode as Code,
NTILE (2) OVER (ORDER BY AVG (Marks) DESC) AS Value FROM StudentMarks
GROUP BY StudentCode
E. SELECT StudentCode AS Code,Marks AS Value
FROM (SELECT StudentCode, Marks AS Marks,
RANK () OVER (PARTITION BY SubjectCode ORDER BY Marks ASC) AS Rank FROM StudentMarks)
tmp WHERE Rank = 1
F. SELECT StudentCode AS Code,Marks AS Value FRCM (
SELECT StudentCode, Marks AS Marks,
RANK() OVER (PARTITION BY SubjectCode ORDER 3Y Marks DESC) AS Rank FRCM StudentMarks)
tmp WHERE Rank = 1
G. SELECT StudentCode AS Code,Marks AS Value FROM
(SELECT StudentCode, Marks AS Marks,
RANK () OVER (PARTITION BY StudentCode ORDER BY Marks ASC) AS Rank FROM StudentMarks)[Page]
tmp WHERE Rank = 1
H. SELECT StudentCode AS Code,Marks AS Value FROM
(SELECT StudentCode, Marks AS Marks,
RANXO OVER (PARTITION BY StudentCode ORDER BY Marks DESC) AS Rank FROM StudentMarks)
tmp WHERE Rank = 1
Answer: A