Gain insights into SQL by exploring database creation, data manipulation, and advanced queries. Learn about practical applications and practice for SQL interviews to build confidence and readiness.

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The ability to work SQL is becoming an increasingly in-demand skill, both for software developers and people in less technical roles. If you’re interested in learning SQL and have no prior experience with it, then this course will be your light in a dark tunnel.

You’ll start by covering the basics of SQL such as how to create a database, how to insert, query, and update data. You’ll also learn fundamental concepts that developers and data scientists use everyday such as multi-table operations, nested queries, and how to set up views. 

Throughout, you’ll get to execute SQL queries in your browser and see results in real-time - you won’t need to worry about set-up.

At the end of this course, you’ll also get some hands-on practice with common SQL interview questions, so when the time comes, you’ll be ready and confident to answer any question that comes your way. Let’s get started!

An Introductory Guide to SQL

# Practice Set 5

For the purpose of demonstrating analytic functions, we added a new __MoviesScreening__ table and added some columns to the existing __Movies__ table. The relevant portion of the database relationship model is printed below.


>Connect to the terminal below by clicking in the widget. Once connected, the command line prompt will show up. Enter or copy and paste the command **./DataJek/Lessons/quiz2.sh** and wait for the MySQL prompt to start-up.


Write and execute queries for the following questions:


1. Calculate the running total of the revenue generated per week for the first 10 weeks for the movie Avengers.

   Expected Result:

| Date  | RevenueInMillions  | RunningTotal  |
| - | - | - |
| 2019-04-26  |  357.115 | 357.115  |
| 2019-05-03  | 147.383  | 504.498  |
| 2019-05-10  | 63.299  | 567.797  |
| ...  |  ... | ...  |
| ...  | ...  |  ... |


2. Calculate the total revenue of each Genre and find the percentage of revenue of each. 

   Expected Result:

| Genre  | TotalRevenueInMillions  | %OfTotalRevenues  |
| - | - | - |
| Action  | 5105.193	  | 86.28  |
| Thriller  | 451.187  | 93.90  |
|  Reality Television | 300.000	  | 98.97  |
| ...  | ...  |  ... |
|  ... | ...  | ...  |

3. Calculate the moving average of revenue generated in a three week window for the movie Ocean’s 11.


   Expected Result:

| Weekend  |  Revenue | 3 Week Total  | 3 Week Avg  |
| - | - | - | - |
| 2001-12-21  |  14.716 | ...  | ...  |
|  2001-12-28 |  16.907 | ...  | ...  |
| ...  | ...  |  ... | ...  |

4. Find the value of RevenueInMillions at the start of each month for the movie Mr. & Mrs. Smith.

   Expected Result:

| Date  |  Month | RevenueInMillions  | FirstValue  |
| - | - | - | - |
| 2005-06-10  | 6  | 50.34  | 50.34  |
| 2005-06-17  |  6 | 26.04  |  50.34 |
| ...  |  ... |  ... | ...  |

4. Calculate the monthly growth rate of revenue for the movie Mission Impossible.

   Expected Result:

| Month  |  Total Revenue In Millions |  Growth % |
| - | - | - |
| 7  |  61.236 | 0.00  |
| 8  | 80.567  | 31.57  |
| ...  |  ... | ...  |


Let's practice querying the tables using business analytics functions.

Introduction

Basic SQL

Joins

Nested Queries

Multi Table Operations

Views

Stored Procedures

Triggers

Miscellaneous

Practice & Prep

Epilogue

Practice Set 5

Practice Set 5