Step-by-step guides for SQL, tools, and practical AI — skills you can use at work. Learn by doing, not by jargon.
Series
Step-by-step paths — start at part 1 and work through at your pace. More series coming.
What Problem Are We Actually Solving?
Stop opening dashboards until you know which decision will change. A practical guide to framing analytics problems for everyday work — questions before data.
How to Check AI-Written SQL Before You Ship It
Chatbots can draft queries in seconds. Here’s a simple checklist so you catch bad joins, wrong filters, and confident nonsense.
SQL Tutorial 13: Strategies for Maintenance and Optimization
Keep databases healthy over time with maintenance strategies: backups and restores, user permissions, and routine upkeep. Build a reliable playbook for integrity, security, and long-term performance.
SQL Tutorial 12: Best Practices and Optimization
Write faster, cleaner SQL with practical optimization habits. This guide covers query tuning basics, indexing strategy, and common performance pitfalls so your databases stay responsive as they grow.
SQL Tutorial 11: Stored Procedures, Triggers, and User-Defined Functions
Automate logic in the database with stored procedures, triggers, and user-defined functions. Learn when each tool fits, how to create them, and how they keep reusable SQL and…
SQL Tutorial 10: Advanced SQL Techniques
Level up beyond basic SELECT with advanced techniques: common table expressions (CTEs), window functions, recursive queries, and pivot-style patterns that make hard analyses more readable and powerful.
SQL Tutorial 9: Views and Indexes
Simplify complex queries with views and speed them up with indexes. This tutorial shows how to create and use views as virtual tables, and how indexes help the…
SQL Tutorial 8: Modifying Data with SQL
Change data safely with INSERT, UPDATE, and DELETE. Practice adding rows, editing existing records, and removing data while keeping integrity in mind — essential skills for day-to-day database…
SQL Tutorial 7: Subqueries in SQL
Nest queries inside queries with subqueries. This lesson explains scalar, multi-row, and correlated subqueries and how to use them in WHERE, FROM, and SELECT to filter and shape…
SQL Tutorial 6: Joins in SQL
Connect related tables with SQL joins. You will learn INNER, LEFT, RIGHT, and FULL joins, how matching keys work, and when to use each type so you can…
SQL Tutorial 5: Aggregate Functions and Grouping Data in SQL
Learn how aggregate functions and GROUP BY turn rows into summaries. This tutorial covers COUNT, SUM, AVG, MIN, and MAX, then shows how to group and filter aggregates…
SQL Tutorial 4: Filtering and Sorting Data in SQL
Ready to take your SQL skills to the next level? Filtering and sorting data is essential for extracting precise information from your databases, and in our latest tutorial,…
