Join Statements - Lab

Introduction

In this lab, you'll practice your knowledge of JOIN statements, using various types of joins and various methods for specifying the links between them.

Objectives

You will be able to:

• Write SQL queries that make use of various types of joins
• Compare and contrast the various types of joins
• Discuss how primary and foreign keys are used in SQL
• Decide and perform whichever type of join is best for retrieving desired data

CRM ERD

In this lab, you'll use the same customer relationship management (CRM) database that you saw from the previous lesson.

Connecting to the Database

Import the necessary packages and connect to the database 'data.sqlite'.

# Your code here

Select the names of all employees in Boston

Hint: join the employees and offices tables. Select the first and last name.

# Your code here

Are there any offices that have zero employees?

Hint: Combine the employees and offices tables and use a group by. Select the office code, city, and number of employees.

# Your code here

Write 3 questions of your own and answer them

# Answers will vary

# Example question: 
"""
How many customers are there per office?
"""

"""
Question 1
"""

# Your code here

"""
Question 2
"""

# Your code here

"""
Question 3
"""

# Your code here

Level Up 1: Display the names of every individual product that each employee has sold

Hint: You will need to use multiple JOIN clauses to connect all the way from employee names to product names.

# Your code here

Level Up 2: Display the number of products each employee has sold

Alphabetize the results by employee last name.

Hint: Use the quantityOrdered column from orderDetails. Also, think about how to group the data when some employees might have the same first or last name.

# Your code here

Level Up 3: Display the names employees who have sold more than 200 different products

Hint: this is different from the previous question because the quantity sold doesn't matter, only the number of different products

# Your code here

Summary

Congrats! You practiced using join statements and leveraged your foreign keys knowledge!