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DataLemur VS PostgreSQL Exercises

Compare DataLemur VS PostgreSQL Exercises and see what are their differences

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DataLemur logo DataLemur

Practice SQL Interview Questions & Data Science Interview Questions asked by FAANG.

PostgreSQL Exercises logo PostgreSQL Exercises

Education & Reference
  • DataLemur Landing page
    Landing page //
    2023-10-20
  • PostgreSQL Exercises Landing page
    Landing page //
    2026-05-03

DataLemur features and specs

  • SQL Interview Questions
    200+
  • Data Science Interview Questions
    100+

PostgreSQL Exercises features and specs

  • Free and accessible
    PostgreSQL Exercises is completely free to use with no registration required, making it highly accessible to anyone who wants to practice SQL skills without any financial barrier.
  • Interactive practice environment
    The site provides a built-in SQL query editor where users can write and execute queries directly in the browser against a real database, getting immediate feedback on their results.
  • Progressive difficulty
    Exercises are well-organized into categories (basic, joins, aggregation, date, string, recursive) and progress from simple to complex, allowing learners to build their skills incrementally.
  • Realistic dataset
    The site uses a realistic country club management scenario with interconnected tables, giving learners practice with a coherent and relatable data model rather than abstract or disconnected examples.
  • Detailed solutions and explanations
    Each exercise comes with a detailed expected result set and a thorough explanation of the solution, helping learners understand not just what the answer is but why it works.

Possible disadvantages of PostgreSQL Exercises

  • Limited dataset scope
    The entire site relies on a single small dataset (a country club with members, facilities, and bookings), which limits exposure to diverse data modeling patterns and real-world complexity.
  • No user progress tracking
    Since there is no account system or registration, the site does not track user progress, making it difficult for learners to pick up where they left off or monitor their improvement over time.
  • PostgreSQL-specific syntax
    The exercises focus specifically on PostgreSQL syntax and features, which may not directly translate to other database systems like MySQL, SQL Server, or Oracle, potentially limiting transferability of learned skills.
  • Outdated design and interface
    The website has a dated visual design and user interface that lacks modern UX features such as syntax highlighting, auto-completion, or responsive mobile support, making it less pleasant to use compared to newer platforms.
  • Limited number of exercises
    The total number of exercises is relatively small compared to other competitive programming or SQL practice platforms, meaning advanced users may quickly exhaust the available problems.

Analysis of DataLemur

Overall verdict

  • DataLemur is a highly regarded platform for practicing SQL and data science interview questions, offering real-world problems from top tech companies along with clear explanations, making it a valuable resource for aspiring data professionals.

Why this product is good

  • Offers a large library of SQL and data science interview questions sourced from real companies like Amazon, Google, and Facebook
  • Provides an interactive in-browser code editor so you can write and test SQL queries without any setup
  • Includes detailed solutions and explanations to help users understand concepts, not just memorize answers
  • Founded by Nick Singh, a well-known figure in the data community, lending credibility to the content
  • Free access to many questions, with premium options for more advanced practice and structured learning

Recommended for

  • Aspiring data analysts, data scientists, and data engineers preparing for job interviews
  • Students and career changers looking to build practical SQL skills
  • Professionals wanting to brush up on data science and analytics interview questions
  • Anyone seeking real-world coding practice with company-specific interview problems

Analysis of PostgreSQL Exercises

Overall verdict

  • PostgreSQL Exercises (pgexercises.com) is an excellent free resource for learning and practicing SQL through hands-on, interactive problems with immediate feedback, making it a valuable tool for anyone looking to sharpen their PostgreSQL skills.

Why this product is good

  • It offers a structured progression of exercises, from basic queries to advanced topics like aggregation, joins, string operations, recursive queries, and date manipulation
  • Each exercise runs against a realistic sample database (a fictional country club), giving practical context to the problems
  • It provides instant feedback and detailed explanations of solutions, reinforcing learning
  • The platform is completely free and requires no signup, so you can start practicing immediately
  • It focuses specifically on PostgreSQL, so you learn Postgres-specific syntax and features rather than generic SQL

Recommended for

  • Beginners who want to learn SQL fundamentals in a hands-on way
  • Developers and analysts who want to strengthen their PostgreSQL query skills
  • People preparing for technical interviews that involve SQL
  • Students supplementing coursework with practical exercises
  • Anyone transitioning to PostgreSQL from another database system

DataLemur videos

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Data Hiring Manager RANKS DataLemur, LeetCode, AnalystBuilder

More videos:

  • Review - DataLemur Laptop vs Mobile Viewership Solution | DataLemur SQL Interview Questions | Analyst Adithya

PostgreSQL Exercises videos

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Category Popularity

0-100% (relative to DataLemur and PostgreSQL Exercises)

DataLemur

PostgreSQL Exercises

SQL
100 100%
SQL
0% 0
Online Education
0 0%
Online Education
100% 100
Interview Preparation
100 100%
Interview Preparation
0% 0
Online Courses
0 0%
Online Courses
100% 100

User comments

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Social recommendations and mentions

Based on our record, PostgreSQL Exercises seems to be more popular. It has been mentiond 1 time since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.

DataLemur mentions (0)

We have not tracked any mentions of DataLemur yet. Tracking of DataLemur recommendations started around Jul 2023.

PostgreSQL Exercises mentions (1)

What are some alternatives?

When comparing DataLemur and PostgreSQL Exercises, you can also consider the following products

LeetCode - Practice and level up your development skills and prepare for technical interviews.

SQLBolt - SQLBolt provides a set of interactive lessons and exercises to help you learn SQL

HackerRank - HackerRank is a platform that allows companies to conduct interviews remotely to hire developers and for technical assessment purposes.

SQLZOO - SQLZoo includes tutorials and reference to support people learning SQL. It features:

Datacamp - DataCamp is a massive open online course (MooC) platform that helps everyone from novices to experts hone their skills with data science.

Select Star SQL - Education & Reference

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