Working with Data

Mastering data manipulation is a fundamental skill for aspiring data scientists. This chapter shifts the focus from understanding basic SQL commands to applying them in real-world data scenarios. You will learn how to efficiently retrieve, filter, and aggregate data to uncover patterns and insights crucial for data-driven decision-making.

Through practical examples, you'll explore the use of SQL functions and expressions, allowing you to perform complex calculations and manipulations directly within your queries. You'll also learn how to join tables, a vital technique for combining data from different sources, and how to handle common data-related challenges such as missing or inconsistent data.

By the end of this chapter, you will be equipped with the skills to query databases and transform raw data into structured and meaningful information. This transformation is key to any data analysis task, enabling you to derive insights and inform strategies based on the available data.