20 07 2018

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QUESTION 222
You use a Microsoft SQL Server database that contains a table. The table has records of web requests as shown in the exhibit. (Click the Exhibit button.)

Your network has three web servers that have the following IP addresses:
10.0.0.1
10.0.0.2
10.0.0.3
You need to create a query that displays the following information:
The number of requests for each web page (UriStem) grouped by the web server (ServerIP)
that served the request
A column for each server
Which Transact-SQL query should you use?

A.
B.
C.
D.
Answer: A
Explanation:
PIVOT rotates a table-valued expression by turning the unique values from one column in the expression into multiple columns in the output, and performs aggregations where they are required on any remaining column values that are wanted in the final output.
References: https://docs.microsoft.com/en-us/sql/t-sql/queries/from-using-pivot-and-unpivot?view=sql-server-2017

QUESTION 223
Drag and Drop Question
You develop a Microsoft SQL Server database for a sales ordering application.
You want to create a report that displays the increase of order quantities over the previous year for each product.
You need to write a query that displays:
Product name,
Year of sales order,
Sales order quantity, and
Increase of order quantity over the previous year.
Which three Transact-SQL segments should you use to develop the solution? To answer, move the appropriate Transact-SQL segments from the list of Transact-SQL segments to the answer area and arrange them in the correct order.

Answer:

Explanation:
Box 1: FROM ..
Box 2: LAG (not LEAD)
Lag accesses data from a previous row in the same result set without the use of a self-join starting with SQL Server 2012 (11.x). LAG provides access to a row at a given physical offset that comes before the current row. Use this analytic function in a SELECT statement to compare values in the current row with values in a previous row.
Not lead: Lead accesses data from a subsequent row in the same result set without the use of a self-join starting with SQL Server 2012 (11.x). LEAD provides access to a row at a given physical offset that follows the current row.
Box 3: GROY BY PRO.NAME, YEAR (OrderDate)
References: https://docs.microsoft.com/en-us/sql/t-sql/functions/lag-transact-sql?view=sql-server-2017

QUESTION 224
You develop a Microsoft SQL Server database that contains a table named Employee, defined as follows:

You need to create a view that contains two computed columns representing the month and the year of the [HireDate] of each Employee.
Which function should you use?

A. DATENAME( )
B. CONVERT( )
C. TRYDATEDIFF( )
D. MONTH( ) and YEAR( )

Answer: D
Explanation:
The Month function returns an integer that represents the month of the specified date.
The Year function an integer that represents the year of the specified date.
References:
https://docs.microsoft.com/en-us/sql/t-sql/functions/month-transact-sql?view=sql-server-2017 https://docs.microsoft.com/en-us/sql/t-sql/functions/year-transact-sql?view=sql-server-2017

QUESTION 225
You administer a Microsoft SQL Server database named ContosoDb. The database has the following schema collection:

The database has a table named ReceivedPurchaseOrders that includes an XML column named PurchaseOrder by using the above schema.
You need to set the requiresApproval attribute of the XML documents to false if they contain more than 50 items.
Which Transact-SQL query should you run?

A.
B.
C.
D.

Answer: D
Explanation:
Replace value of (XML DML) updates the value of a node in the document.
Example: — update text in the first manufacturing step
SET @myDoc.modify(‘
replace value of (/Root/Location/step[1]/text())[1]
with “new text describing the manu step”
‘);

QUESTION 226
Drag and Drop Question
Your Microsoft SQL Server database contains tables as shown below.
You have tables that were created by running the following Transact-SQL statements:

The Product table contains 10,000 records. The maximum ProductID is 11,000.
There are 12 rows in the Category table. The maximum CategoryID is 12.
The Product table contains at least one product in every category.
Data in the tables was accidently modified. To correct this, you need to make some updates directly to the tables. You issue several statements.
Which result or results will you obtain for each Transact-SQL statement? To answer, drag the appropriate results to the correct Transact-SQL statements. Each result may be used once. More than once, or not at all. You may need to drag the split bar between panes or scroll to view content.

Answer:

Explanation:
Box 1:
The SET IDENTITY_INSERT command allows explicit values to be inserted into the identity column of a table.
Box 2:
The Product table contains at least one product in every category.
Box 3:
Box 4:
Bit is a data type that can take a value of 1, 0, or NULL.
References:
https://docs.microsoft.com/en-us/sql/t-sql/data-types/bit-transact-sql?view=sql-server-2017 https://docs.microsoft.com/en-us/sql/t-sql/statements/set-identity-insert-transact-sql?view=sql-server-2017

QUESTION 227
Drag and Drop Question
You develop an application that uses data from a Microsoft SQL Server database.
Your application experiences blocking problems.
You need to enable row versioning and you want connections to have row versioning enabled by default.
How should you complete the Transact-SQL statement? To answer, drag the appropriate command to the correct positions. Each command may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.

Answer:

Explanation:
You can use a row versioning-based isolation level.
Set READ_COMMITTED_SNAPSHOT database option ON to enable read-committed transactions to use row versioning, and use snapshot isolation.
References: https://docs.microsoft.com/en-us/sql/relational-databases/sql-server-transaction-locking-and-row-versioning-guide?view=sql-server-2017

QUESTION 228
Drag and Drop Question
You are a developer for a Microsoft SQL Server database. You need to write a stored procedure that performs several operations in the most efficient way possible.
Which operator or operators should you use? To answer, drag the appropriate operators to the correct operations. Each operator may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.

Answer:

Explanation:
Box 1: UNION ALL
UNION combines the results of two or more queries into a single result set that includes all the rows that belong to all queries in the union.
UNION ALL Incorporates all rows into the results. This includes duplicates. If ALL is not specified, duplicate rows are removed.
Box 2: INTERSECT
INTERSECT returns distinct rows that are output by both the left and right input queries operator.
Box 3: INNER JOIN
The INNER JOIN keyword selects records that have matching values in both tables.
Box 4: MERGE
Merge performs insert, update, or delete operations on a target table based on the results of a join with a source table. For example, you can synchronize two tables by inserting, updating, or deleting rows in one table based on differences found in the other table.
Box 5: FULL OUTER JOIN
The FULL OUTER JOIN keyword return all records when there is a match in either left (table1) or right (table2) table records.
Note: FULL OUTER JOIN can potentially return very large result-sets!
Incorrect Answers:
EXCEPT returns distinct rows from the left input query that aren’t output by the right input query.
References:
https://docs.microsoft.com/en-us/sql/t-sql/statements/merge-transact-sql?view=sql-server-2017 https://docs.microsoft.com/en-us/sql/t-sql/language-elements/set-operators-union-transact-sql?view=sql-server-2017

QUESTION 229
You develop a database application for Microsoft SQL Server and Microsoft Azure SQL Database.
You need to raise an exception and transfer execution to a CATCH block.
You need to ensure that the exception returns output in the following format:
– Msg 51000, Level 16, State 1, Line 1
– The record does not exist.
Which Transact-SQL statement should you run?

A.
B.
C.
D.
Answer: B
Explanation:
The following example shows how to use the THROW statement to raise an exception.
THROW 51000, ‘The record does not exist.’, 1;
Here is the result set.
Msg 51000, Level 16, State 1, Line 1
The record does not exist.
References: https://docs.microsoft.com/en-us/sql/t-sql/language-elements/throw-transact-sql?view=sql-server-2017

QUESTION 230
Drag and Drop Question
You develop a database application for Microsoft SQL Server 2012 and Microsoft Azure SQL Database.
You create a table named Purchasing.vVendorWithAddresses as shown in the following table.

You write the following Transact-SQL (Line numbers are included for reference only.)
01 CREATE PROCEDURE

You need to add Transact-SQL statements at line 08 to ensure that GetVendorInStateNeighbors returns the names of vendors that are located in all states where the vendor specified in the @vendorname parameter has a location.
Which three Transact-SQL segments should you use to develop the solution? To answer, move the appropriate Transact-SQL segments from the list of Transact-SQL segments to the answer area and arrange them in the correct order.

Answer:

Explanation:
The IN statement determines whether a specified value matches any value in a subquery or a list.
Incorrect:
The EXISTS command specifies a subquery to test for the existence of rows.
References: https://docs.microsoft.com/en-us/sql/t-sql/language-elements/in-transact-sql?view=sql-server-2017

QUESTION 231
A local bank uses a SQL Server database to manage accounts. You are developing a stored procedure that contains multiple Transact-SQL INSERT statements.
The stored procedure must use transaction management to handle errors.
You need to ensure that the stored procedure rolls back the entire transaction if a run-time occurs.
Which Transact-SQL statement should you add to the stored procedure?

A. SET ARITHABORT ON
B. SET NOEXEC ON
C. SET TRANSACTION ISOLATION LEVEL ON
D. SET XACT_ABORT ON

Answer: D
Explanation:
SET XACT_ABORT specifies whether SQL Server automatically rolls back the current transaction when a Transact-SQL statement raises a run-time error.
When SET XACT_ABORT is ON, if a Transact-SQL statement raises a run-time error, the entire transaction is terminated and rolled back.
References: https://docs.microsoft.com/en-us/sql/t-sql/statements/set-xact-abort-transact-sql?view=sql-server-2017

QUESTION 232
Drag and Drop Question
You are the administrator for a heavily-used OLTP Microsoft SQL Server database.
You are troubleshooting performance issues seen when using stored procedures in the database. The database stores millions of orders across thousands of customers. Some of the customers have large numbers of orders, while others have only one order. You update the statistics and perform defragmentation of all tables and indexes, but two stored procedures still have issues when accessing data.
p_GetCustomer accepts @companyID as a parameter. From the results of profiling, you know that 90 percent of the calls use the @companyid value of 5, while the other 10 percent of calls are evenly distributed across another 10000 values. While viewing the execution plan, you discover that a non-clustered index seek is used.
p_GetShipDate accepts @orderID as a parameter and returns the ship date for that order. You discover that the execution plan is performing a scan on a non- clustered index that has orderID as the index key.
You need to add appropriate query hints to each stored procedure to improve the performance.
What should you do? To answer, drag the appropriate procedures to the correct hints. Each procedure may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.

Answer:

Explanation:
Box 1: Optimize FOR..
OPTIMIZE FOR ( @variable_name { UNKNOWN | = literal_constant } [ , …n ] )
Instructs the query optimizer to use a particular value for a local variable when the query is compiled and optimized. The value is used only during query optimization, and not during query execution.
Box 2: FORCESEEK
FORCESEEK [ (index_value(index_column_name [ ,… n ] )) ]
Specifies that the query optimizer use only an index seek operation as the access path to the data in the table or view.
References:
https://docs.microsoft.com/en-us/sql/t-sql/queries/hints-transact-sql-query?view=sql-server-2017 https://docs.microsoft.com/en-us/sql/t-sql/queries/hints-transact-sql-table?view=sql-server-2017