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READ Free Dumps For Microsoft- 70-461





Question ID 15151

You develop an SQL Server database. The database contains a table that is defined by the
following T-SQL statements:

The table contains duplicate records based on the combination of values in the surName,
givenName, and dateOfBirth fields.
You need to remove the duplicate records.
How should you complete the relevant Transact-SQL statements? To answer, drag the
appropriate code segment or segments to the correct location or locations in the answer
area. Each code 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.

 

Option A

Example: let us write a query which will delete all duplicate data in one shot. We will use a CTE (Common Table Expression) for this purpose. We will read in future posts what a CTE is and why it is used. On a lighter note, CTE's can be imagined as equivalent to temporary result sets that can be used only in an underlying SELECT, INSERT, UPDATE, DELETE or CREATE VIEW statement. ;WITH CTE AS ( SELECT Name , City , [State] , ROW_NUMBER() OVER(PARTITION BY Name, City, [State] ORDER BY [Name]) AS Rnum FROM Persons ) DELETE FROM CTE WHERE Rnum <> 1 In the code by saying WHERE Rnum <> 1, we are asking SQL Server to keep all the records with Rank 1, which are not duplicates, and delete any other record. After executing this query in SQL Server Management Studio, you will end up with no duplicates in your table. To confirm that just run a simple query against your table.

Correct Answer A
Explanation


Question ID 15152

You are maintaining a Microsoft SQL Server database. You run the following query:

You observe performance issues when you run the query. You capture the following query
execution plan:

You need to ensure that the query performs returns the results as quickly as possible.
Which action should you perform?

Option A

Add a new index to the ID column of the Person table.

Option B

Add a new index to the EndDate column of the History table.

Option C

Create a materialized view that is based on joining data from the ActiveEmployee and History tables.

Option D

Create a computed column that concatenates the GivenName and SurName columns.

Correct Answer A
Explanation Explanation: Cost is 53% for the Table Scan on the Person (p) table. This table scan is on the ID column, so we should put an index on it.

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