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Querying Data with Transact-SQL (beta)

Question No: 21 HOTSPOT

Note: This question is part of a series of questions that use the same scenario. For your convenience, the scenario is repeated in each question. Each question presents a different goal and answer choices, but the text of the scenario is exactly the same in each question in this series.

You query a database that includes two tables: Project and Task. The Project table includes the following columns:

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You need to identify the owner of each task by using the following rules:

  • Return each task’s owner if the task has an owner.

  • If a task has no owner, but is associated with a project that has an owner, return the project’s owner.

  • Return the value -1 for all other cases.

How should you complete the Transact-SQL statement? To answer, select the appropriate Transact-SQL segments in the answer area.

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Answer:

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Explanation:

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Box 1: COALESCE

COALESCE evaluates the arguments in order and returns the current value of the first expression that initially does not evaluate to NULL.

Box 2: T.UserID, p.UserID, -1

  • Return each task’s owner if the task has an owner.

  • If a task has no owner, but is associated with a project that has an owner, return the project’s owner.

  • Return the value -1 for all other cases.

Box 3: RIGHT JOIN

The RIGHT JOIN keyword returns all rows from the right table (table2), with the matching rows in the left table (table1). The result is NULL in the left side when there is no match. Here the right side could be NULL as the projectID of the task could be NULL.

References:

https://msdn.microsoft.com/en-us/library/ms190349.aspx http://www.w3schools.com/Sql/sql_join_right.asp

Question No: 22 DRAG DROP

Note: This question is part of a series of questions that use the same scenario. For your convenience, the scenario is repeated in each question. Each question presents a different goal and answer choices, but the text of the scenario is exactly the same in each question on this series.

You have a database that tracks orders and deliveries for customers in North America. System versioning is enabled for all tables. The database contains the Sales.Customers, Application.Cities, and Sales.CustomerCategories tables.

Details for the Sales.Customers table are shown in the following table:

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Details for the Application.Cities table are shown in the following table:

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Details for the Sales.CustomerCategories table are shown in the following table:

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You are creating a report to measure the impact of advertising efforts that were designed to attract new customers. The report must show the number of new customers per day for each customer category, but only if the number of new customers is greater than five.

You need to write the query to return data for the report.

How should you complete the Transact-SQL statement? To answer, drag the appropriate Transact-SQL segments to the correct locations. Each Transact-SQL segment 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.

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Answer:

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Question No: 23 DRAG DROP

Note: This question is part of a series of questions that use the same scenario. For your convenience, the scenario is repeated in each question. Each question presents a different goal and answer choices, but the text of the scenario is exactly the same in each question in this series.

You are developing a database to track customer orders. The database contains the following tables: Sales.Customers, Sales.Orders, and Sales.OrderLines. The following table describes the columns in Sales.Customers.

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The following table describes the columns in Sales.Orders.

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The following table describes the columns in Sales.OrderLines.

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You need to create a stored procedure that inserts data into the Customers table. The stored procedure must meet the following requirements:

  • Data changes occur as a single unit of work.

  • Data modifications that are successful are committed and a value of 0 is returned.

  • Data modifications that are unsuccessful are rolled back. The exception severity level is set to 16 and a value of -1 is returned.

  • The stored procedure uses a built-it scalar function to evaluate the current condition of data modifications.

  • The entire unit of work is terminated and rolled back if a run-time error occurs during execution of the stored procedure.

How should complete the stored procedure definition? To answer, drag the appropriate

Transact-SQL segments to the correct targets. Each Transact-SQL segment 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.

NOTE: Each correct selection is worth one point.

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Answer:

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Explanation:

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Explanation

Box 1: XACT_ABORT

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.

Box 2: COMMIT

Commit the transaction. Box 3: XACT_STATE

Box 4: ROLLBACK

Rollback the transaction

Box 5: THROW

THROW raises an exception and the severity is set to 16.

Requirement: Data modifications that are unsuccessful are rolled back. The exception severity level is set to 16 and a value of -1 is returned.

References:

https://msdn.microsoft.com/en-us/library/ms188792.aspx https://msdn.microsoft.com/en-us/library/ee677615.aspx

Question No: 24 DRAG DROP

Note: This question is part of a series of questions that use the same scenario. For your convenience, the scenario is repeated in each question. Each question presents a different goal and answer choices, but the text of the scenario is exactly the same in each question on this series.

You have a database that tracks orders and deliveries for customers in North America. System versioning is enabled for all tables. The database contains the Sales.Customers, Application.Cities, and Sales.CustomerCategories tables.

Details for the Sales.Customers table are shown in the following table:

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Details for the Application.Cities table are shown in the following table:

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Details for the Sales.CustomerCategories table are shown in the following table:

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The marketing department is performing an analysis of how discount affect credit limits. They need to know the average credit limit per standard discount percentage for customers whose standard discount percentage is between zero and four.

You need to create a query that returns the data for the analysis.

How should you complete the Transact-SQL statement? To answer, drag the appropriate Transact-SQL segments to the correct locations. Each Transact-SQL segments 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.

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Answer:

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Explanation:

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Box 1: 0, 1, 2, 3, 4

Pivot example:

– Pivot table with one row and five columns

SELECT #39;AverageCost#39; AS Cost_Sorted_By_Production_Days, [0], [1], [2], [3], [4]

FROM

(SELECT DaysToManufacture, StandardCost FROM Production.Product) AS SourceTable PIVOT

(

AVG(StandardCost)

FOR DaysToManufacture IN ([0], [1], [2], [3], [4])

) AS PivotTable; Box 2: [CreditLimit]

Box 3: PIVOT

You can use the PIVOT and UNPIVOT relational operators to change a table-valued expression into another table. 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.

Box 4: 0, 1, 2, 3, 4

The IN clause determines whether a specified value matches any value in a subquery or a list.

Syntax: test_expression [ NOT ] IN ( subquery | expression [ ,…n ] ) Where expression[ ,… n ]

is a list of expressions to test for a match. All expressions must be of the same type as test_expression.

References: https://technet.microsoft.com/en-us/library/ms177410(v=sql.105).aspx

Question No: 25

You have a database that stored information about servers and application errors. The database contains the following tables.

Servers

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Errors

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You need to return all error log messages and the server where the error occurs most often.

Which Transact-SQL statement should you run?

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  1. Option A

  2. Option B

  3. Option C

  4. Option D

Answer: C

Question No: 26

Note: This question is part of a series of questions that present the same scenario. Each question in the series contains a unique solution that might meet the stated goals. Some question sets might have more than one correct solution, while others might not have a correct solution.

After you answer a question in this section. you will NOT be able to return to it. As a result, these questions will not appear in the review screen.

You create a table named Products by running the following Transact-SQL statement:

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You have the following stored procedure:

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You need to modify the stored procedure to meet the following new requirements:

  • Insert product records as a single unit of work.

  • Return error number 51000 when a product fails to insert into the database.

  • If a product record insert operation fails, the product information must not be permanently written to the database.

Solution: You run the following Transact-SQL statement:

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Does the solution meet the goal?

  1. Yes

  2. No

Answer: B Explanation:

A transaction is correctly defined for the INSERT INTO ..VALUES statement, and if there is an error in the transaction it will be caught ant he transaction will be rolled back. However, error number 51000 will not be returned, as it is only used in an IF @ERROR = 51000 statement.

Note: @@TRANCOUNT returns the number of BEGIN TRANSACTION statements that have occurred on the current connection.

References: https://msdn.microsoft.com/en-us/library/ms187967.aspx

Question No: 27 HOTSPOT

You have the following stored procedure:

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You run the following Transact-SQL statements:

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What is the result of each Transact-SQL statement? To answer, select the appropriate options in the answer area.

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Answer:

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Explanation:

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Box 1: All transactions are rolled back.

The first IF-statement, IF @CODE = #39;C2323#39; AND @ApplicationID = 1, will be true, an error will be raised, the error will be caught in the CATCH block, and the only transaction that has been started will be rolled back.

Box 2: Only Log1, Log2, and Log3 tables are updated.

The second IF-statement, IF @Code = #39;C2323#39;, will be true, so the second transaction will be rolled back, but log1, log2, and log3 was updated before the second transaction.

Question No: 28

Note: This question is part of a series of questions that use the same or similar answer choices. An answer choice may be correct for more than one question in the series. Each question is independent of the other questions in this series. Information and details provided in a question apply only to that question.

You have a table named Products that contains information about the products that your company sells. The table contains many columns that do not always contain values.

You need to implement an ANSI standard method to convert the NULL values in the query output to the phrase “Not Applicable”.

What should you implement?

  1. the COALESCE function

  2. a view

  3. a table-valued function

  4. the TRY_PARSE function

  5. a stored procedure

  6. the ISNULL function

  7. a scalar function

  8. the TRY_CONVERT function

Answer: F Explanation:

The ISNULL function replaces NULL with the specified replacement value. References: https://msdn.microsoft.com/en-us/library/ms184325.aspx

Question No: 29

Note: This question is part of a series of questions that present the same scenario. Each question in the series contains a unique solution that might meet the stated goals. Some question sets might have more than one correct solution, while others might not have a correct solution.

After you answer a question in this section. you will NOT be able to return to it. As a result, these questions will not appear in the review screen.

You create a table named Products by running the following Transact-SQL statement:

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You have the following stored procedure:

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You need to modify the stored procedure to meet the following new requirements:

  • Insert product records as a single unit of work.

  • Return error number 51000 when a product fails to insert into the database.

  • If a product record insert operation fails, the product information must not be permanently written to the database.

Solution: You run the following Transact-SQL statement:

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Does the solution meet the goal?

  1. Yes

  2. No

Answer: B Explanation:

With X_ABORT ON the INSERT INTO statement and the transaction will be rolled back when an error is raised, it would then not be possible to ROLLBACK it again in the IF XACT_STATE() lt;gt; O ROLLACK TRANSACTION statmen.

Note: A transaction is correctly defined for the INSERT INTO ..VALUES statement, and if there is an error in the transaction it will be caught ant he transaction will be rolled back, finally an error 51000 will be raised.

Note: When SET XACT_ABORT is ON, if a Transact-SQL statement raises a run-time error, the entire transaction is terminated and rolled back.

XACT_STATE is a scalar function that reports the user transaction state of a current running request. XACT_STATE indicates whether the request has an active user transaction, and whether the transaction is capable of being committed.

The states of XACT_STATE are:

0 There is no active user transaction for the current request.

  1. The current request has an active user transaction. The request can perform any actions, including writing data and committing the transaction.

  2. The current request has an active user transaction, but an error has occurred that has caused the transaction to be classified as an uncommittable transaction.

References:

https://msdn.microsoft.com/en-us/library/ms188792.aspx https://msdn.microsoft.com/en-us/library/ms189797.aspx

Question No: 30 DRAG DROP

Note: This question is part of a series of questions that use the same scenario. For your convenience, the scenario is repeated in each question. Each question presents a different goal and answer choices, but the text of the scenario is exactly the same in each question in this series.

You query a database that includes two tables: Project and Task. The Project table includes the following columns:

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Task level is defined using the following rules:

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You need to determine the task level for each task in the hierarchy.

Which five 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.

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Answer:

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Explanation:

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Box 1: SELECT CAST (NULL AS INT) AS ParentTaskID, etc.

This statement selects all tasks with task level 0.

The ParentTaskID could be null so we should use CAST (NULL AS INT) AS ParentTaskID.

Box 2: UNION

We should use UNION and not UNION ALL as we do not went duplicate rows. UNION specifies that multiple result sets are to be combined and returned as a single result set.

Incorrect: Not UNION ALL: ALL incorporates all rows into the results. This includes duplicates. If not specified, duplicate rows are removed.

Box 3, Box 4, Box 5:

These statements select all tasks with task level gt;0.

References:

https://msdn.microsoft.com/en-us/library/ms180026.aspx

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