Intro to SQL with PostgreSQL - CodeSignal Learn
Free beginner course: 5 lessons + 25 practices to query Postgres
A free beginner course on CodeSignal Learn that teaches SQL through hands-on practice with real PostgreSQL databases. Covers the SQL basics behind reliable data querying and retrieval: selecting, filtering, sorting, and interpreting data with SELECT, WHERE, ORDER BY, aggregations, and working with tables. Includes 5 lessons, 25 practice exercises, and ~2 hours of interactive learning - no prior experience needed.
Data ScienceFreebeginner~2 hours
Submitted by @yahianaimRoadmap (4 steps)
1
Getting started
~20 min#SQL & Databases#PostgreSQL Setup#Running Your First Query
2
Querying data
~40 min#SELECT#WHERE & Filtering#Sorting Results
3
Aggregations
~30 min#Aggregate Functions#GROUP BY#Counting & Summarizing
4
Putting it into practice
~30 min#Hands-on Exercises#25 Practice Challenges#Next: SQL Joins