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
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Easy  
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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
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Easy  
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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.

Pet Detection

5min
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Easy 
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NUM

Data Science Confusion matrix Machine learning Public New

A classifier that predicts if an image contains only a cat, a dog, or a llama produced the following confusion matrix:

  True values    
Dog Cat Llama
Predicted values     Dog 14 2 1
Cat 2 12 3
Llama 5 2 19

What is the accuracy of the model, in percentages?

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Premium Questions

The premium question library contains our unique, hand-crafted questions. We offer a refund if you find any of them answered online.

Questions
Movies, Index Performance, Poll, Rectangles, Retirees, Authors, Countries, Employee Manager, Cheapest Product, Movies Live, ATM Locations, Developers, Delete Orders, Restaurant Menu, Roads, Sales, Student Activities, Transactions, Projects, Youngest Child, Tasks, Ingredients, Autocomplete, Bank Branches, Hospital Patients, Menu Items, Ban Users, SMS Messages, Student Max Score, Age and Earnings, Subscribers, Credit Wizard, Clean CSV, Median Height, Free Throws, Birthday Cards, CTR, Class Grades, Bacterial Growth, Distribution Fitting, Department Report, Merge Stock Index, Credit Score, Cubic Approximation
Skills
SQL Aggregation Subqueries Indexes Conditions Insertion Language Joins Constraints Database schema Bug fixing Delete Update Views Performance tuning Data Science Linear regression Poisson distribution Probability Decision tree Python data libraries Data aggregation Sorting Binomial distribution p-value Curve Fitting Cauchy distribution Exponential distribution Normal distribution Union k-nearest neighbors Machine learning Nonlinear regression
Score Distribution
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