ExamTopics Logo
Mail Us[email protected]
Menu
Microsoft Discussions
exam questions

Exam 70-761 All Questions

View all questions & answers for the 70-761 exam
Go to Exam

Exam 70-761 topic 1 question 90 discussion

Actual exam question from Microsoft's 70-761
Question #: 90
Topic #: 1
[All 70-761 Questions]

You have a database that includes the following tables.

HumanResources.Employee -


Sales.SalesPerson -

The HumanResources.Employee table has 2,500 rows, and the Sales.SalesPerson table has 2,000 rows.
You review the following Transact-SQL statement:

You need to determine the performance impact of the query.
How many times will a lookup occur on the primary key index on the Sales.SalesPerson table?

  • A. 200
  • B. 2,000
  • C. 2,500
  • D. 5,500
Show Suggested Answer Hide Answer
Suggested Answer: C 🗳️
by Hjkasdjfoiasdfh at Aug. 2, 2020, 12:25 p.m.

Comments

Chosen Answer:
This is a voting comment (?). It is better to Upvote an existing comment if you don't have anything to add.
Switch to a voting comment New
Submit Cancel
Hjkasdjfoiasdfh
Highly Voted 4 years, 9 months ago
Correct
upvoted 5 times
...
d_m
Most Recent 4 years, 7 months ago
why is the correct answer 2500?
upvoted 1 times
HA2020
4 years, 5 months ago
because it is a correlated query that the constant is compared to, the server will have to do the comparison for each record.
upvoted 1 times
...
...
Oooo
4 years, 7 months ago
Answer is correct but the inner query is wrong. In the inner query it should be sp.BusinessentityID=e.BusyinessentityID.
upvoted 1 times
BabyBee
4 years, 5 months ago
The order of the factors do not affect the product. It's the same as: WHERE e.BusinessentityID=sp.BusyinessentityID
upvoted 1 times
...
...
Community vote distribution
A (35%)
C (25%)
B (20%)
Other
Most Voted
A voting comment increases the vote count for the chosen answer by one.

Upvoting a comment with a selected answer will also increase the vote count towards that answer by one. So if you see a comment that you already agree with, you can upvote it instead of posting a new comment.

SaveCancel
exam
Someone Bought Contributor Access for:
SY0-701
London, 1 minute ago