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RDBMS Playground is a cross-platform terminal application developed by Lazy Evaluation Ltd, currently at version 0.2.0, the single release available at the time of writing. It is an educational tool designed for learning relational database concepts through hands-on experimentation in a safe sandbox environment. Rather than functioning as a database administration utility, it serves as a teaching playground where users can explore the fundamentals of relational database management systems, including tables, columns, primary and foreign keys, relationships, indexes, queries, and query plans. The software is structured to accommodate learners at different stages of familiarity with databases. Its simple mode introduces beginners to the subject through guided, keyword-based commands, making it suitable for users encountering questions as basic as what a primary key is and how tables relate to one another. As users gain confidence, the advanced mode allows them to progress to writing raw SQL, executing real queries, and reading the corresponding execution plans, so that the same playground scales from foundational concepts to practical query work without requiring a switch to a different tool. This progressive design makes the application relevant to the database education and developer tools categories, and it is well suited to use cases such as classroom instruction, self-paced study, tutoring environments, and onboarding for developers new to SQL. Because it runs in a terminal user interface and operates cross-platform, it fits into command-line workflows on a variety of operating systems without the overhead of configuring a full database server or risking damage to production data. The sandboxed nature of the environment means learners can experiment freely with schema definitions, relationships, and indexing strategies, observing how their choices affect query behavior and execution plans. With only one version currently published, RDBMS Playground 0.2.0 represents an early-stage release aimed at making relational database theory approachable, interactive, and directly connected to the practical skills of writing and understanding SQL.
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