SQL & Database Mastery
Databases power every AI product. Go from your first SELECT to window functions, indexing, database architecture, SQL with Python — and SQL for AI engineering with pgvector and RAG.
https://github.com/waleedkhokar/python-ai-engineering-journey/tree/main/10-Master-SQL-and-Database-for-AI-World — so you always land in the right place, never on a guessed sub-folder.What You Will Learn
All Classes
Every class in this course, in order — with exactly what each class teaches. Notes, code and interview prep for each class live in the course folder on GitHub.
SQL Introduction
What SQL is, DBMS vs RDBMS, command types (DDL, DML, DQL, DCL, TCL).
Database Fundamentals
Tables, rows, columns, keys, data types, constraints, CREATE / ALTER / DROP.
SELECT & Filtering
SELECT, WHERE, operators, ORDER BY, LIMIT, NULL handling, pagination.
Aggregations & GROUP BY
COUNT, SUM, AVG, GROUP BY, HAVING, CASE, FILTER.
JOINs
INNER, LEFT, RIGHT, FULL, CROSS and SELF joins, anti-joins, common pitfalls.
Subqueries & CTEs
Correlated subqueries, EXISTS, IN, CTEs, UNION, INTERSECT, EXCEPT.
Advanced SQL
Window functions, recursive CTEs, ROLLUP / CUBE, LATERAL, JSONB, arrays, full-text search.
Transactions & Concurrency
INSERT / UPDATE / DELETE, upsert, ACID, isolation levels, MVCC, locks, deadlocks.
Indexes & Performance
Index types, composite, partial and covering indexes, EXPLAIN ANALYZE.
Database Design
ER modelling, normalization (1NF to BCNF), denormalization, foreign-key actions.
Advanced Database
Views, materialized views, functions, procedures, triggers, roles, RLS, SQL injection.
Database Architecture
OLTP vs OLAP, data warehousing, partitioning, replication, sharding, backup, CAP.
SQL + Python
psycopg, Pandas + SQL, SQLAlchemy, Alembic migrations, FastAPI integration.
SQL for AI Engineering
Text-to-SQL, SQL agents, safe SQL execution, pgvector, hybrid search, RAG.
Projects in this course
Build them all — each project lives in the course folder on GitHub.
Interview Preparation
Every class in this course includes interview preparation. Open the course folder on GitHub for the full material.
Common Interview Questions
The questions interviewers actually ask on this course's topics, with clear, structured answers.
Open Interview PrepCoding Challenges
Hands-on problems for each class, so you can prove the skill, not just describe it.
Open Interview PrepCommon Mistakes to Avoid
The errors beginners make with these topics — and how professionals avoid them.
Open Interview PrepBest Practices
How working engineers write this code in production: clean, tested and maintainable.
Open Interview Prep