How To Ace the SQL Ratio Problems In Data Science Interviews

SQL is a fundamental language used in data science for querying and manipulating data. During data science interviews, candidates are often presented with ratio problems that require them to work with numerical data and calculate ratios. These problems test a candidate’s ability to analyze and manipulate data in SQL.

In this article, we will discuss how to ace the SQL ratio problems commonly encountered in data science interviews. We will cover the definition of a ratio problem, two common methods for solving them, and two specific types of ratio problems: the subscription rate problem and the immediate order problem. For each problem, we will provide a problem statement and demonstrate how to solve it using the subquery method and the CASE WHEN method.

By the end of this article, you will have a thorough understanding of how to tackle SQL ratio problems and impress interviewers in data science interviews.

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Table of Content:

1. What is the Ratio Problem?
2. Two Common Methods to Solve the Ratio Problem
3. Subscription Rate Problem
   3.1. Problem Statment
   3.2. Solving the Problem using the Subquery Method
   3.3. Solving the Problem using the CASE WHEN Method
4. Immediate Order Problem
   4.1…