datacamp.com
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DataCamp is an online learning platform for data science and analytics offering interactive, browser-based courses and tracks. It features SQL and database-related content, including hands-on coding exercises, guided projects, and assessments to practice querying, data modeling, and database design concepts.
More resources on Database Design
geeksforgeeks.org
GeeksforGeeks is a programming and computer science education site that provides tutorials, articles, and practice problems on a wide range of topics, including databases, SQL, and database design concepts such as normalization and ER modeling.
Database Design
Coursera course: Relational Database Design
vertabelo.com
Vertabelo is an online database modeling tool and educational resource offering ER diagrams, data modeling tutorials, and guidance on database design and SQL generation.