Edusodes for Teams is now in early access. Learn more
Series · Technology · Foundational
Query real data with confidence, starting from zero.
SQL, From the Ground Up
For analysts, product managers and anyone who has waited on someone else to pull a number. Six episodes take you from what a table is to joining tables and summarizing results, with a worked query in every episode.
How this series is made. Planned by Edusodes editors. Episodes 1 to 3 are written by our editors; the remaining episodes are produced with AI to the same editorial structure when you reach them.
What a relational database actually stores, and why everything in SQL is a question asked of a table.
The anatomy of a SELECT statement, and how to choose exactly the columns you need.
Narrow millions of rows to the handful that matter using comparisons, AND, OR and NULL-aware logic.
ORDER BY and LIMIT: getting the top ten of anything, reliably and repeatably.
COUNT, SUM and AVG, and how GROUP BY turns thousands of rows into a summary.
The finale: combine customers and orders with JOIN to answer a real business question.
Already have an account? Sign in