Developer Builds PostgreSQL School Database to Practice Core SQL Concepts

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A developer learning SQL created a practice project called Greenwood Academy, a relational school database built using PostgreSQL. The project involved designing three core tables — students, subjects, and exam results — linked through foreign keys to model real-world school data. Key SQL concepts practiced included schema creation, data insertion, table modification using ALTER statements, and applying conditional logic with CASE WHEN. The project demonstrated foundational database design principles such as primary keys, serial ID generation, and enforcing data integrity with NOT NULL constraints. The exercise was shared on DEV Community as a beginner-friendly guide for others starting their SQL learning journey.

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