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CQL is an open-source tool that uses category theory to perform database operations such as querying, migrating, and integrating data with built-in correctness guarantees through theorem proving.
EventQL is a SQL-inspired query language designed for event sourcing, offering first-class support for event properties, subject hierarchies, and SQL-like expressiveness to efficiently query event streams.
The author details the process of designing a custom query language tailored for non-technical analysts to filter vehicle maintenance data, outlining user needs, data schema, and specific use cases.