Use The Index, Luke
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Free guide to SQL performance and indexing fundamentals
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SQLZoo
Free interactive SQL learning platform
DB-Fundamentals
Interactive SQL and database tutorials
SQL Tutorial - Full Database Course for Beginners
freeCodeCamp.org 4-hour SQL course covering fundamentals
Databases and SQL for Data Science with Python
Working knowledge of SQL (or Structured Query Language) is a must for data professionals like Data Scientists, Data Analysts and Data Engineers. Much of the world's data resides in databases. SQL is a powerful language used for communicating with and extracting data from databases. In this course you will learn SQL inside out- from the very basics of Select statements to advanced concepts like JOINs. You will: -write foundational SQL statements like: SELECT, INSERT, UPDATE, and DELETE -filter result sets, use WHERE, COUNT, DISTINCT, and LIMIT clauses -differentiate between DML & DDL -CREATE, ALTER, DROP and load tables -use string patterns and ranges; ORDER and GROUP result sets, and built-in database functions -build sub-queries and query data from multiple tables -access databases as a data scientist using Jupyter notebooks with SQL and Python -work with advanced concepts like Stored Procedures, Views, ACID Transactions, Inner & Outer JOINs through hands-on labs and projects You will practice building SQL queries, work with real databases on the Cloud, and use real data science tools. In the final project you’ll analyze multiple real-world datasets to demonstrate your skills.
Database Systems: The Complete Book
Database Systems: The Complete Book - A book resource
geeksforgeeks.org
GeeksforGeeks is a computer science education site offering tutorials, explanations, and practice problems across programming, data structures, algorithms, and database topics. For database fundamentals, it provides SQL tutorials, DBMS concepts, sample queries, and interview-style content.