What is the total number of active phone numbers currently in the database? 

Task Summary: In this assessment, you are required to demonstrate your ability to understand the requirements for various data information requests from an existing database and develop appropriate SQL statements to satisfy those requirements.

Context: Being able to query a database is a fundamental skill that is required by all information systems professionals who work with relational databases.  In this assessment, you will utilize the basic query skills that are typically used to extract information for analysis, reporting and data cleansing in a data management setting. Timely provisioning of key business information promotes effective communication and enhanced solution delivery.

Task Instructions Please read and examine carefully the attached MIS602_Assessment 2_Data Implementation_ Case study and then derive the SQL queries to return the required information. Your focus should be providing the output as meaningful and presentable possible. Please note, extra marks will be awarded for presentation and readability of SQL queries including ordering of the columns Please note all the SQL queries should be generated using MySQL server either using MySQL workbench or MySQL Command Line Client.

Provide SQL statements and the query output for the following questions:

1 What is the total number of active phone numbers currently in the database?   3 Marks

2 Display a list of customers living in north or south Clayton.   3 Marks

3 List all the unique phone colours owned by the users.  3 Marks

4 List all the customers who are iPhone users.  3 Marks

5 How many employees have resigned company?   3 Marks

6 Display all the staff, and their supervisor details if they have one.  4 Marks

7 List all the staff who are supervisors.  4 Marks

8 On average, how many calls were made in each month of 2019. Order by month in ascending order.  4 Marks

9 What is the second highest pay rate for a staff member?  4 Marks

10 List all the customers who are IPhone users.  4 Marks

11 List all the customers who have more than one phone number registered.  4 Marks

12 Display the average age of users based on mobile plan.  5 Marks

13 Assume in 2019, the company decided to apply a 20 cent call charge for every call made, as a fixed charge regardless of the call duration, and 0.10 cents for each minute spent on call. Assuming the call durations are in seconds,

1. a) How much income has the company generated through this fixed charge in dollars from 2019 onwards?
2. b) What is the total income is generated in total for both call and fixed charges in this period. 5 Marks

14 List all the customers, and the staff who processed their mobile registrations.  5 Marks

15 List the details of the staff who served the highest number of customers.  5 Marks

16 Evaluate the ‘called Number’ column in calls, and write a query to find how many of these numbers are registered in this database (mobile network).  5 Marks

17 List all the active phone numbers that has never made a call. Show this query using: a) Nested Query

1. b) SQL Join 5 Marks

18 (i) Create a view showing the popularity of all towers based on number of connections made

(ii) Use this view to generate the most popular tower location 5 Marks