4 lessons
SQL syntax cheat sheet
Every core SQL statement, clause and pattern from this course in one place - DDL, DML, joins, aggregation, window functions and more - for quick reference.
PostgreSQL cheat sheet
psql meta-commands, roles and privileges, JSONB, arrays, full-text search, and connection strings - the PostgreSQL-specific reference for this course.
MySQL & MariaDB cheat sheet
The mysql command-line client, storage engines, users and hosts, and the exact syntax differences from PostgreSQL - a quick reference.
NoSQL cheat sheet: MongoDB and Redis
MongoDB CRUD and the aggregation pipeline mapped directly to SQL, plus Redis's core data structures and the cache-aside pattern - a quick reference.