General Data Science and SQL Online Test

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

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 and write SQL queries that extract and combine data.

Recommended Job Roles
Data Analyst
Data Scientist
Sample Candidate Report

Sample Free Questions

Students

3min
  -  
Easy  
  -  
CODE

SQL Aggregation Select 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

General Data Science Confusion matrix Machine learning Public

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
Authors, Cheapest Product, Countries, Developers, Employee Manager, Merge Stock Index, Movies, Movies Live, Rectangles, Retirees, Sales, Student Activities, Tasks, Transactions, Youngest Child, Manager Sales, Average Salary, Movie Genres, Auto Show, Poll, Subscribers, Age and Earnings, Rain, Patient Classification, CTR, Wine Quality, Credit Wizard, Student Rankings, Welfare Organization, Bacterial Growth, Student Max Score
Skills
SQL Conditions Select Aggregation Subqueries Ordering Bug fixing Left join Union Group by Insert Joins CTE SQL CASE General Data Science Poisson distribution Probability Linear regression Classification ROC Decision boundary Binomial distribution p-value Correlation Multicollinearity Decision tree Curve Fitting Performance tuning
Score Distribution
# of candidates
0-33%
34-66%
67-100%
Score
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