Introduction to Relational Databases (RDBMS) (Coursera)
Relational database systems (Coursera)
Relational Database Design (Coursera)
Database Management Essentials (Coursera)
Database Design and Basic SQL in PostgreSQL (Coursera)
Advanced MySQL Topics (Coursera)
Databases for Data Scientists (CourseraSpecs)
Database Design and Operational Business Intelligence (CourseraSpecs)