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Querying Microsoft SQL Server 2012

Question No: 1

You are a database developer of a Microsoft SQL Server 2012 database.

The database contains a table named Customers that has the following definition:

image

You need to ensure that the CustomerId column in the Orders table contains only values that exist in the CustomerId column of the Customer table.

Which Transact-SQL statement should you use?

  1. ALTER TABLE Orders

    ADD CONSTRAINT FX_Orders_CustomerID FOREIGN KEY (CustomerId) REFERENCES Customer (CustomerId)

  2. ALTER TABLE Customer

    ADD CONSTRAINT FK_Customer_CustomerID FOREIGN KEY {CustomerID) REFERENCES

    Orders (CustomerId)

  3. ALTER TABLE Orders

    ADD CONSTRAINT CK_Orders_CustomerID

    CHECK (CustomerId IN (SELECT CustomerId FROM Customer))

  4. ALTER TABLE Customer ADD OrderId INT NOT NULL; ALTER TABLE Customer

    ADD CONSTRAINT FK_Customer_OrderID FOREIGN KEY (OrderID) REFERENCES

    Orders (OrderID);

  5. ALTER TABLE Orders

ADD CONSTRAINT PK Orders CustomerId PRIMARY KEY (CustomerID)

Answer: A

Reference: http://msdn.microsoft.com/en-us/library/ms189049.aspx

Question No: 2

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 top half of the students arranged by their average marks must be given a rank of 1 and the remaining students must be given a rank of 2. Which Transact-SQL query should you use?

  1. SELECT StudentCode as Code,

    RANK() OVER (ORDER BY AVG (Marks) DESC) AS Value

    FROM StudentMarks GROUP BY StudentCode

  2. SELECT Id, Name, Marks,

    DENSE_RANK() OVER (ORDER BY Marks DESC) AS Rank

    FROM StudentMarks

  3. SELECT StudentCode as Code,

    DENSE_RANK() OVER (ORDER BY AVG (Marks) DESC) AS Value

    FROM StudentMarks GROUP BY StudentCode

  4. SELECT StudentCode as Code,

    NTILE (2) OVER (ORDER BY AVG (Marks) DESC) AS Value

    FROM StudentMarks GROUP BY StudentCode

  5. 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

  6. SELECT StudentCode AS Code,Marks AS Value FROM ( SELECT StudentCode, Marks AS Marks,

    RANK() OVER (PARTITION BY SubjectCode ORDER BY Marks DESC) AS Rank

    FROM StudentMarks) tmp WHERE Rank = 1

  7. 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) tmp WHERE Rank = 1

  8. 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: D

Question No: 3

You administer a Microsoft SQL Server 2012 database. The database contains a table named Employee.

Part of the Employee table is shown in the exhibit. (Click the Exhibit button.)

image

image

Unless stated above, no columns in the Employee table reference other tables.

Confidential information about the employees is stored in a separate table named EmployeeData. One record exists within EmployeeData for each record in the Employee table.

You need to assign the appropriate constraints and table properties to ensure data integrity and visibility.

On which column in the Employee table should you create a Foreign Key constraint that references a different table in the database?

  1. DateHired

  2. DepartmentID

  3. EmployeeID

  4. EmployeeNum

  5. FirstName

  6. JobTitle

  7. LastName

  8. MiddleName

  9. ReportsToID

Answer: C Explanation:

Use the EmployeeID, which would be used as a primary key in the Employee table, when defining a foreign key constraint from another table in the database.

Question No: 4

You are developing a database that will contain price information.

You need to store the prices that include a fixed precision and a scale of six digits. Which data type should you use?

  1. Real

  2. Small money

  3. Money

  4. Decimal

Answer: D

Question No: 5

You are developing a database application by using Microsoft SQL Server 2012. You have a query that runs slower than expected.

You need to capture execution plans that will include detailed information on missing indexes recommended by the query optimizer.

What should you do?

  1. Add a HASH hint to the query.

  2. Add a LOOP hint to the query.

  3. Add a FORCESEEK hint to the query.

  4. Add an INCLUDE clause to the index.

  5. Add a FORCESCAN hint to the Attach query.

  6. Add a columnstore index to cover the query.

  7. Enable the optimize for ad hoc workloads option.

  8. Cover the unique clustered index with a columnstore index.

  9. Include a SET FORCEPLAN ON statement before you run the query.

  10. Include a SET STATISTICS PROFILE ON statement before you run the query.

  11. Include a SET STATISTICS SHOWPLAN_XML ON statement before you run the query.

  12. Include a SET TRANSACTION ISOLATION LEVEL REPEATABLE READ statement before you run the query.

  13. Include a SET TRANSACTION ISOLATION LEVEL SNAPSHOT statement before you run the query.

  14. Include a SET TRANSACTION ISOLATION LEVEL SERIALIZABLE statement before you run the query.

Answer: K

Question No: 6

You need to build a table structure for a stored procedure to support data entry from a website form. The website form must meet the following requirements:

image

Which two actions should you perform? Each correct answer presents part of the solution.

  1. Add the CHECK constraint to the table structure.

  2. Add the DATEPART function to the stored procedure.

  3. Add the DEFAULT constraint to the table structure.

  4. Add the SYSDATETIMEOFFSET function to the stored procedure.

  5. Add the ISDATE function to the stored procedure.

Answer: D,E Explanation:

SYSDATETIMEOFFSET returns a datetimeoffset(7) value that contains the date and time of the computer on which the instance of SQL Server is running.

ISDATE returns 1 if the expression is a valid date, time, or datetime value; otherwise, 0. References:https://msdn.microsoft.com/en-us/library/bb677334.aspx

Question No: 7

You are developing a database that will contain price information.

You need to store the prices that include a fixed precision and a scale of six digits. Which data type should you use?

  1. Smallmoney

  2. Numeric

  3. Money

  4. Varchar

Answer: B

Explanation: Numeric data types that have fixed precision and scale.

decimal[ (p[ , s] )] and numeric[ (p[ , s] )] where

  • p (precision)

    The maximum total number of decimal digits that will be stored, both to the left and to the right of the decimal point. The precision must be a value from 1 through the maximum precision of 38. The default precision is 18.

  • (scale)

The number of decimal digits that will be stored to the right of the decimal point.

Reference: decimal and numeric (Transact-SQL) https://msdn.microsoft.com/en-us/library/ms187746.aspx

Question No: 8

You develop a Microsoft SQL Server 2012 server database that supports an application. The application contains a table that has the following definition:

CREATE TABLE Inventory

(ItemID int NOT NULL PRIMARY KEY,

ItemsInStore int NOT NULL, ItemsInWarehouse int NOT NULL)

You need to create a computed column that returns the sum total of the ItemsInStore and ItemsInWarehouse values for each row.

Which Transact-SQL statement should you use?

  1. ALTER TABLE Inventory

    ADD TotalItems AS ItemsInStore ItemsInWarehouse

  2. ALTER TABLE Inventory

    ADD ItemsInStore – ItemsInWarehouse = TotalItemss

  3. ALTER TABLE Inventory

    ADD TotalItems = ItemsInStore ItemsInWarehouse

  4. ALTER TABLE Inventory

ADD TotalItems AS SUM(ItemsInStore, ItemsInWarehouse);

Answer: A

Reference: http://technet.microsoft.com/en-us/library/ms190273.aspx

Question No: 9

You administer several Microsoft SQL Server 2012 database servers. Merge replication has been configured for an application that is distributed across offices throughout a wide area network (WAN). Many of the tables involved in replication use the XML and varchar (max) data types. Occasionally, merge replication fails due to timeout errors. You need to reduce the occurrence of these timeout errors. What should you do?

  1. Set the Merge agent on the problem subscribers to use the slow link agent profile.

  2. Create a snapshot publication, and reconfigure the problem subscribers to use the snapshot publication.

  3. Change the Merge agent on the problem subscribers to run continuously.

  4. Set the Remote Connection Timeout on the Publisher to 0.

Answer: A

Question No: 10

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?

  1. Add a HASH hint to the query.

  2. Add a LOOP hint to the query.

  3. Add a FORCESEEK hint to the query.

  4. Add an INCLUDE clause to the index.

  5. Add a FORCESCAN hint to the Attach query.

  6. Add a columnstore index to cover the query.

  7. Enable the optimize for ad hoc workloads option.

  8. Cover the unique clustered index with a columnstore index.

  9. Include a SET FORCEPLAN ON statement before you run the query.

  10. Include a SET STATISTICS PROFILE ON statement before you run the query.

  11. Include a SET STATISTICS SHOWPLAN_XML ON statement before you run the query.

  12. Include a SET TRANSACTION ISOLATION LEVEL REPEATABLE READ statement before you run the query.

  13. Include a SET TRANSACTION ISOLATION LEVEL SNAPSHOT statement before you run the query.

  14. Include a SET TRANSACTION ISOLATION LEVEL SERIALIZABLE statement before you run the query.

Answer: F

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