Contains quizzes on several materials at codecademy
There are :
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Learn SQL
Lesson 1 - Manipulation Lesson 2 - Queries Lesson 3 - Aggregate Functions Lesson 4 - Multiple Tables
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Learn Python 3
Lesson 1 - Hello World Lesson 2 - Control Flow Lesson 3 - Introduction to Lists Lesson 3 - Working with Lists in Python Lesson 4 - Loops Lesson 5 - Functions Python: Code Challenges I Python Code Challenges I - Control Flow Python Code Challenges I - Control Flow (Advanced) Python Code Challenges I - Lists Python Code Challenges I - Lists (Advanced) Python Code Challenges I - Loops Python Code Challenges I - Loops (Advanced) Python Code Challenges I - Functions Python Code Challenges I - Functions (Advanced) Lesson 6 - Introduction to Strings Lesson 6 - String Methods Lesson 8 - Creating Dictionaries Lesson 8 - Using Dictionaries Lesson 9 - Python Files Lesson 10 - Introduction to Classes Python: Code Challenges II Python Code Challenges II - Strings Python Code Challenges II - Strings (Advanced) Python Code Challenges II - Dictionaries Python Code Challenges II - Dictionaries (Advanced) Python Code Challenges II - Classes
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Learn Microsoft Excel for Data Analysis
Lesson 1 - Exploring Data Quiz Lesson 2 - Visualizing Data Lesson 3 - Handling Data
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Handling Missing Data
Lesson 1 - Introduction to Missing Data Lesson 2 - Deletion Lesson 3 - Imputation