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MySQL Essentials
Database
Databasebeginner
Core MySQL concepts: tables, indexes, CRUD, joins, and basic optimization.
PostgreSQL Fundamentals
Database
Databaseintermediate
Schemas, roles, extensions, and query basics in PostgreSQL.
Advanced SQL
Database
Databaseadvanced
CTEs, window functions, query optimization, and complex joins.
SQL Crash Course
Database
Databasebeginner
Fast-track intro to SELECT, INSERT, UPDATE, DELETE, joins, and constraints.
Database Schema Design
Database
Databaseintermediate
Normalization, keys, relationships, and real-world modeling patterns.