Your Perfect Assignment is Just a Click Away

Starting at $8.00 per Page

100% Original, Plagiarism Free, Customized to Your instructions!

glass
pen
clip
papers
heaphones

Relational Database Design Process

Relational Database Design Process

  

Unit 6: Design Assignment

Introduction

The relational database design process includes the process of identifying the tables, and the fields (columns) with associated types. The types of fields may differ from one database management system to another.

For example, MySQL database field types are given in this document: Data Types (Links to an external site.). They include text, numerical (data or ID) date and other field types.

As we learned, some of the fields could also be used to store IDs of records from another (related tables) to provide relations between the records. For example, if one table lists classes, another one lists students, we can create a table to record student enrollment. Then the enrollment table should have student IDs and class ID as its fields to record enrollment of the particular student into a particular class.

A new startup company is planning to build a system that would collect user preferences over different venues (restaurants, movie theaters, museums, etc.). The company utilizes a continuous scale of rating between zero and five to describe users’ preferences.

Directions 

The task of this assignment is to design the structure of the database for a startup company that would allow the storage of user’s preferences.

Submit a Word document with tables (one for each database table) that lists the following:

· Field name

· Field type (use MySQL data types (Links to an external site.))

· A comment on the role of the field

In order to complete the assignment, you will need to identify the number of tables that would efficiently store data collected by the startup company. And design the fields including the ones that would store ID values of other table(s) in order to ensure relations between tables. Please use arrows to identify the relations between table fields.

Here is an example of the design for the student enrollment database:

Unit 6: Coding Assignment

Introduction

SQL statements allow us to retrieve, manipulate, or delete data stored in relational databases. Here are few examples of SQL statements:

The INSERT statement is used to insert data into a table: For example:

INSERT INTO `students’ (‘student_id`, `first_name`, `age`) VALUES (14, “Melissa”, 23);

The SELECT statement is used to retrieve data. For example, to get the list of students use:

SELECT * FROM `students`;

Where * means to return a table with all columns of the initial table.

You can limit the output columns:

SELECT `first_name` FROM `students`;

To use a condition, you can add a WHERE statement

SELECT * FROM `students` WHERE student_id = 12;

If you need to aggregate information in the table, you can use a function like MAX, or AVG for average, or COUNT.

For example, if you need to calculate an average students’ age, you would use this fucntion:

SELECT AVG(`age`) FROM `students`;

The DELETE statement can be used to delete data. Note that if no WHERE conditions are given all data from the table will be deleted.

For, example, to delete all re-enrollment records for a student with id equal to 14:

DELETE from `enrollment` WHERE `student_id`=14

Directions

For the database design in the design assignment for this week write an SQL script to:

· Insert two a new user;

· Retrieve the list of places in a given category;

· Find the number of ratings submitted by a given user;

· Delete all preferences submitted by a user with a given ID = 342

Submit your script to the dropbox as a text document.


"Place your order now for a similar assignment and have exceptional work written by our team of experts, guaranteeing you A results."

Order Solution Now

Our Service Charter


1. Professional & Expert Writers: Eminence Papers only hires the best. Our writers are specially selected and recruited, after which they undergo further training to perfect their skills for specialization purposes. Moreover, our writers are holders of masters and Ph.D. degrees. They have impressive academic records, besides being native English speakers.

2. Top Quality Papers: Our customers are always guaranteed of papers that exceed their expectations. All our writers have +5 years of experience. This implies that all papers are written by individuals who are experts in their fields. In addition, the quality team reviews all the papers before sending them to the customers.

3. Plagiarism-Free Papers: All papers provided by Eminence Papers are written from scratch. Appropriate referencing and citation of key information are followed. Plagiarism checkers are used by the Quality assurance team and our editors just to double-check that there are no instances of plagiarism.

4. Timely Delivery: Time wasted is equivalent to a failed dedication and commitment. Eminence Papers are known for the timely delivery of any pending customer orders. Customers are well informed of the progress of their papers to ensure they keep track of what the writer is providing before the final draft is sent for grading.

5. Affordable Prices: Our prices are fairly structured to fit in all groups. Any customer willing to place their assignments with us can do so at very affordable prices. In addition, our customers enjoy regular discounts and bonuses.

6. 24/7 Customer Support: At Eminence Papers, we have put in place a team of experts who answer all customer inquiries promptly. The best part is the ever-availability of the team. Customers can make inquiries anytime.