Microsoft 70-762 ExamDeveloping SQL Databases (beta)

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Up to date Microsoft 70-762 - An Overview 11 to 20

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Q11. You have a view that includes an aggregate.

You must be able to change the values of columns in the view. The changes must be reflected in the tables that the view uses.

You need to ensure that you can update the view. What should you create?

A. table-valued function

B. a schema-bound view

C. a partitioned view

D. a DML trigger

Answer: B

Explanation:

When you use the SchemaBinding keyword while creating a view or function you bindthe structure of any underlying tables or views. It means that as long as that schemabound object exists as a schemabound object (ie you don’t remove schemabinding) you are limited in changes that can be made to the tables or views that it refers to.

References:https://sqlstudies.com/2014/08/06/schemabinding-what-why/


Q12. HOTSPOT

You are maintaining statistics for a database table named tblTransaction. The table contains more than 10 million records.

You need to create a stored procedure that meets the following requirements:

- On weekdays, update statistics for a sample of the total number of records in the table.

- On weekends, update statistics by sampling all rows in the table. A maintenance task will call this stored procedure daily.

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

NOTE: Each correct selection is worth one point.

Answer:

Explanation:

Box 1: UPDATE STATISTICS Box 2: SAMPLE 20 PERCENT

UPDATE STATISTICS tablenameSAMPLE number { PERCENT | ROWS }

Specifies the approximate percentage or number of rows in the table or indexed view for the query optimizer to use when it updates statistics. For PERCENT, number can be from 0 through 100 and for ROWS, number can be from0 to the total number of rows.

Box 3: UPDATE STATISTICS Box 4: WITH FULLSCAN

FULLSCAN computes statistics by scanning all rows in the table or indexed view. FULLSCAN and SAMPLE 100 PERCENT have the same results. FULLSCAN cannot be used with the SAMPLE option.

References:https://msdn.microsoft.com/en-us/library/ms187348.aspx


Q13. Note: This question is part of a series of questions that present the same scenario. Each question in the series contains a unique solution. Determine whether the solution meets the stated goals.

You have a database that contains a table named Employees. The table stored information about the employees of your company.

You need to implement the following auditing rules for the Employees table:

- Record any changes that are made to the data in the Employees table.

- Customize the data recorded by the audit operations.

Solution: You implement a stored procedure on the Employees table. Does the solution meet the goal?

A. Yes

B. No

Answer: B

Explanation:

We should use table-valued functions, not procedures, to customize the recorded change data.

References: https://msdn.microsoft.com/en-us/library/cc645858.aspx


Q14. 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 have a database named Sales that contains the following database tables: Customer, Order, and Products. The Products table and the Order table are shown in the following diagram.

The customer table includes a column that stores the data for the last order that the customer placed.

You plan to create a table named Leads. The Leads table is expected to contain approximately 20,000 records. Storage requirements for the Leads table must be minimized.

You need to create triggers that meet the following requirements:

In the table below, identify the trigger types that meet the requirements.

NOTE: Make only selection in each column. Each correct selection is worth one point.

Answer:

Explanation:

INSTEAD OF INSERT triggers can be defined on a view or table to replace the standard action of the INSERT statement.

AFTER specifies that the DML trigger is fired only when all operationsspecified in the triggering SQL statement have executed successfully.

References:https://technet.microsoft.com/en-us/library/ms175089(v=sql.105).aspx


Q15. Note: This question is part of a series of questions that present the same scenario. Each question in the series contains a unique solution. Determine whether the solution meets the stated goals.

You need to create a stored procedure that updates the Customer, CustomerInfo, OrderHeader, and OrderDetails tables in order.

You need to ensure that the stored procedure:

Solution: You create a stored procedure that includes the following Transact-SQL segment:

Does the solution meet the goal?

A. Yes

B. No

Answer: B

Explanation:

References: http://stackoverflow.com/questions/11444923/stored-procedure-to-update- multiple-tables


Q16. 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 the series.

You have a database named Sales that contains the following database tables. Customer, Order, and Products. The Products table and the order table shown in the following diagram.

The Customer table includes a column that stores the date for the last order that the customer placed.

You plan to create a table named Leads. The Leads table is expected to contain approximately 20,000 records. Storage requirements for the Leads table must be minimized.

You need to begin to modify the table design to adhere to third normal form.

Which column should you remove for each table? To answer? drag the appropriate column names to the correct locations. Each column name 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:

In the Products table the SupplierName is dependant on the SupplierID, not on the ProductID.

In the Orders table the ProductName is dependant on the ProductID, not on the OrderID.

Note:

A table is in third normal form when the following conditions are met:

* It is in second normal form.

* All nonprimary fields are dependent on the primarykey.

Second normal form states that it should meet all the rules for First 1Normnal Form and there must be no partial dependences of any of the columns onthe primary key.

First normal form (1NF) sets the very basic rules for an organized database:

* Define the data items required, because they become the columns in a table. Place

related data items in a table.

* Ensure that there are no repeating groups ofdata.

* Ensure that there is a primary key. References:https://www.tutorialspoint.com/sql/third-normal-form.htm


Q17. Note: This question is part of a series of questions that present the same scenario. Each question in this series contains a unique solution. Determine whether the solution meets the stated goals.

Your company has employees in different regions around the world.

You need to create a database table that stores the following employee attendance information:

- Employee ID

- date and time employee checked in to work

- date and time employee checked out of work

Date and time information must be time zone aware and must not store fractional seconds. Solution: You run the following Transact-SQL statement:

Does the solution meet the goal?

A. Yes

B. No

Answer: A

Explanation:

Datetimeoffset defines a date that is combined with a time of a day that has time zone awareness and is based on a 24-hour clock.

Syntaxis: datetimeoffset [ (fractional seconds precision) ]

Forthe use"datetimeoffset(0)", the Fractional seconds precision is 0, which is required here. References:https://msdn.microsoft.com/en-us/library/bb630289.aspx


Q18. DRAG DROP

You are monitoring a Microsoft Azure SQL Database. The database is experiencing high CPU consumption.

You need to determine which query uses the most cumulative CPU.

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 one or not at all. You may need to drag the split bar between panes or scroll to view content.

Answer:

Explanation:

Box 1: sys.dm_exec_query_stats

sys.dm_exec_query_stats returns aggregateperformance statistics for cached query plans in SQL Server.

Box 2: highest_cpu_queries.total_worker_time DESC Sort ontotal_worker_time column

Example: The following example returns information about the top five queries ranked by average CPU time.

Thisexample aggregates the queries according to their query hash so that logically equivalentqueries are grouped by their cumulative resource consumption.

USE AdventureWorks2012; GO

SELECT TOP 5 query_stats.query_hash AS "Query Hash", SUM(query_stats.total_worker_time) / SUM(query_stats.execution_count) AS "Avg CPU Time",

MIN(query_stats.statement_text) AS "Statement Text" FROM

(SELECT QS.*,

SUBSTRING(ST.text, (QS.statement_start_offset/2) + 1,

((CASE statement_end_offset

WHEN -1 THEN DATALENGTH(ST.text)

ELSE QS.statement_end_offset END

- QS.statement_start_offset)/2) + 1) AS statement_text FROM sys.dm_exec_query_stats AS QS

CROSS APPLY sys.dm_exec_sql_text(QS.sql_handle)as ST) as query_stats GROUP BY query_stats.query_hash

ORDER BY 2 DESC;

References: https://msdn.microsoft.com/en-us/library/ms189741.aspx


Q19. HOTSPOT

You are analyzing the performance of a database environment.

You need to find all unused indexes in the current database.

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

Answer:

Explanation:

Example: Following query helps you to find all unused indexes within database using sys.dm_db_index_usage_stats DMV.

-- Ensure a USE statement has been executed first. SELECT u.*

FROM [sys].[indexes] i

INNER JOIN[sys].[objects] o ON (i.OBJECT_ID = o.OBJECT_ID)

LEFT JOIN [sys].[dm_db_index_usage_stats] u ON (i.OBJECT_ID = u.OBJECT_ID) AND i.[index_id] = u.[index_id]

AND u.[database_id] = DB_ID() --returning the database ID of the current database WHERE o.[type] <>'S' --shouldn't be a system base table

AND i.[type_desc] <> 'HEAP' AND i.[name] NOT LIKE 'PK_%'

AND u.[user_seeks] + u.[user_scans] + u.[user_lookups] = 0 AND u.[last_system_scan] IS NOT NULL

ORDER BY 1 ASC

References:https://basitaalishan.com/2012/06/15/find-unused-indexes-using-sys-dm_db_index_usage_stats/


Q20. 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 have a database named Sales that contains the following database tables: Customer, Order, and Products. The Products table and the Order table are shown in the following diagram.

The customer table includes a column that stores the data for the last order that the customer placed.

You plan to create a table named Leads. The Leads table is expected to contain approximately 20,000 records. Storage requirements for the Leads table must be minimized.

You need to implement a stored procedure that deletes a discontinued product from the Products table. You identify the following requirements:

What should you do? To answer, select the appropriate Transact-SQL segments in the answer area.

Answer:

Explanation:

Using TRY...CATCH inTransact-SQL

Errors in Transact-SQL code can be processed by using a TRY…CATCH construct. TRY…CATCH can use the following error function to capture error information:

ERROR_MESSAGE() returns the complete text of the error message. The text includes the

values supplied for any substitutable parameters such as lengths, object names, or times. References:https://technet.microsoft.com/en-us/library/ms179296(v=sql.105).aspx


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