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Implementing Datalog in Python: A Relational Database Language More Powerful Than SQL

2025-06-13

This article demonstrates how to implement Datalog, a relational database language more powerful than SQL, using Python. Datalog, a subset of Prolog, isn't Turing-complete but excels at modeling relationships. The article thoroughly explains Datalog's core concepts, including predicates, facts, rules, and variables, and provides a straightforward Python implementation featuring the Naïve Evaluation algorithm. With this implementation, you can create and query Datalog programs, experiencing the elegance and power of this relational modeling approach.

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Generic Programming in C: A Comparison of Four Approaches

2025-03-19

C's lack of support for generic types (parametric polymorphism) is a common frustration. This article explores four methods for emulating generics in C: template macros, template headers, type erasure, and inlining macros. Template macros are simple but suffer from readability and error-proneness; template headers improve readability but still have naming challenges; type erasure sacrifices type safety but is useful for FFI or dynamic linking; inlining macros are user-friendly but lead to code bloat. Ultimately, the author suggests choosing between template headers (easier to develop) and inlining macros (easier to use) based on project needs.

Development