vertabelo.com
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Vertabelo is an online database modeling tool and educational resource offering ER diagrams, data modeling tutorials, and guidance on database design and SQL generation.
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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.
datacamp.com
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.
Database Design
Coursera course: Relational Database Design