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Cracking the Data Science Interview

Cracking the Data Science Interview

By : Leondra R. Gonzalez, Stubberfield
4.7 (6)
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Cracking the Data Science Interview

Cracking the Data Science Interview

4.7 (6)
By: Leondra R. Gonzalez, Stubberfield

Overview of this book

The data science job market is saturated with professionals of all backgrounds, including academics, researchers, bootcampers, and Massive Open Online Course (MOOC) graduates. This poses a challenge for companies seeking the best person to fill their roles. At the heart of this selection process is the data science interview, a crucial juncture that determines the best fit for both the candidate and the company. Cracking the Data Science Interview provides expert guidance on approaching the interview process with full preparation and confidence. Starting with an introduction to the modern data science landscape, you’ll find tips on job hunting, resume writing, and creating a top-notch portfolio. You’ll then advance to topics such as Python, SQL databases, Git, and productivity with shell scripting and Bash. Building on this foundation, you'll delve into the fundamentals of statistics, laying the groundwork for pre-modeling concepts, machine learning, deep learning, and generative AI. The book concludes by offering insights into how best to prepare for the intensive data science interview. By the end of this interview guide, you’ll have gained the confidence, business acumen, and technical skills required to distinguish yourself within this competitive landscape and land your next data science job.
Table of Contents (21 chapters)
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1
Part 1: Breaking into the Data Science Field
4
Part 2: Manipulating and Managing Data
10
Part 3: Exploring Artificial Intelligence
16
Part 4: Getting the Job

Mastering SQL basics

As a data scientist, mastering the basics of SQL is crucial. Luckily for you, the basics are pretty easy to grasp, even for non-technical learners. This is because, at this stage, SQL generally reads like English sentences. To get you started, this section focuses on three fundamental components of SQL: the SELECT, WHERE, and ORDER BY statements.

The SELECT statement

The SELECT statement is the foundation of any SQL query and is used to retrieve data from a database. The general syntax is as follows:

SELECT column1, column2, ..., columnN
FROM table_name;

The syntax lists the different columns you want to return, separated by a comma. Since databases hold numerous tables, the query code specifies which table to select the columns using the FROM statement. Lastly, the semi-colon (;) is used to mark the end of a query.

Note

It is standard to create a new line of the query for each main clause (which is capitalized). Here, we started a new line once...

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