# What does the term “aggregate functions” refer to-What are the various aggregate operations used in relational operations?

Assignment 1

Question One

a) What is natural join operation in relational algebra and why do we need it.

(b) From the below given tables:

Student

 SID Name Grade Dept-ID 1 Abdullah 95 CS 2 Naif 94 IT 3 Rayan 92 DS 4 Suleman 93 DS

Enrolled Department

 Dept-ID Department CS Computer Science IT DS Information Technology Data Science

Write a relational algebra query to find the names of all students in relation to the departments in which they are enrolled.

Show the results of the natural join operation from the part (i) query in a table.

Question Two

What does the term “aggregate functions” refer to? What are the various aggregate operations used in relational operations?

 Learning Outcome(s): Recognize database file organization and indexing.

Question Three

Create B-tree of degree 3 for the following set of key values added in order. Show the steps after every insertion.43, 24, 33, 60, 20, 22, 51, 32, 27

 Learning Outcome(s): Recognize database file organization and indexing.

Question Four

What type of method for collision resolution is shown below? briefly explain it by your own words. define another type of method for collision resolution and provide example.

## Calculate the price of your order

550 words
We'll send you the first draft for approval by September 11, 2018 at 10:52 AM
Total price:
\$26
The price is based on these factors:
Number of pages
Urgency
Basic features
• Free title page and bibliography
• Unlimited revisions
• Plagiarism-free guarantee
• Money-back guarantee
On-demand options
• Writer’s samples
• Part-by-part delivery
• Overnight delivery
• Copies of used sources
Paper format
• 275 words per page
• 12 pt Arial/Times New Roman
• Double line spacing
• Any citation style (APA, MLA, Chicago/Turabian, Harvard)

# Our guarantees

Delivering a high-quality product at a reasonable price is not enough anymore.
That’s why we have developed 5 beneficial guarantees that will make your experience with our service enjoyable, easy, and safe.

### Money-back guarantee

You have to be 100% sure of the quality of your product to give a money-back guarantee. This describes us perfectly. Make sure that this guarantee is totally transparent.

### Zero-plagiarism guarantee

Each paper is composed from scratch, according to your instructions. It is then checked by our plagiarism-detection software. There is no gap where plagiarism could squeeze in.

### Free-revision policy

Thanks to our free revisions, there is no way for you to be unsatisfied. We will work on your paper until you are completely happy with the result.