Data Science and SQL Online Test

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The Data Science and SQL test assesses a candidate’s ability to analyze data, extract information, suggest conclusions, and support decision-making. It also tests candidate’s knowledge of SQL queries and relational database concepts, such as indexes and constraints.

It's the ideal test for pre-employment screening. Data scientists and data analysts need to be able to extract knowledge and insights from data. Often, they also need a solid understanding of SQL to interface and access an SQL database efficiently.

This test requires candidates to demonstrate their ability to apply probability and statistics when solving data science problems, write programs using Python for the same purpose, write SQL queries that extract, combine, and manipulate data.

Recommended Job Roles
Data Analyst
Data Scientist
Sample Candidate Report

Sample Free Questions

Students

3min
  -  
Easy  
  -  
CODE

SQL Aggregation Public

Given the following data definition, write a query that returns the number of students whose first name is John. String comparisons should be case sensitive.

TABLE students
   id INTEGER PRIMARY KEY,
   firstName VARCHAR(30) NOT NULL,
   lastName VARCHAR(30) NOT NULL

Enrollment

5min
  -  
Easy  
  -  
CODE

SQL Conditions Update Public

A table containing the students enrolled in a yearly course has incorrect data in records with ids between 20 and 100 (inclusive).

TABLE enrollments
  id INTEGER NOT NULL PRIMARY KEY
  year INTEGER NOT NULL
  studentId INTEGER NOT NULL

Write a query that updates the field 'year' of every faulty record to 2015.

AB Test

10min
  -  
Easy  
  -  
MCQ

Data Science Bayes' theorem Probability Public

Your company is running a test that is designed to compare two different versions of the company’s website.

Version A of the website is shown to 60% of users, while version B of the website is shown to the remaining 40% of users. The test shows that 8% of users who are presented with version A sign up for the company’s services, compared to 4% of users who are presented with version B.

If a user signs up for the company’s services, what is the probability that she/he was presented with version A of the website?

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SQL Aggregation Subqueries Indexes Conditions Insertion Language Data Science Cauchy distribution Exponential distribution Normal distribution Python Joins Data aggregation Union Poisson distribution Probability k-nearest neighbors Constraints Database Schema Bug fixing Delete Update Views Binomial distribution p-value Performance tuning Sorting
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