PgJQ: Use Jq in Postgres
In plain words
PgJQ is a PostgreSQL extension that integrates the jq JSON query language into Postgres databases. It allows developers to process and manipulate JSON data using jq's syntax directly within SQL queries. The tool is designed for database users who need advanced JSON filtering, transformation, and extraction capabilities without leaving their Postgres environment. It stands out by bringing a specialized JSON processing tool into the database layer, enabling more complex data operations natively.
written from the facts on this page · September 2026
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Hi HN, I built Eigendrum, a web tool that solves the 2D wave equation for arbitrary shapes so you can hear what they sound like as drums. How it works: * Solves -∇²u = λu using finite element analysis (Kφ = λMφ) on a triangle mesh. * Validated to <0.1% error against closed-form solutions for circles (Bessel zeros) and rectangles. * Sound model factors in strike location, Rayleigh damping, and mallet width. * Includes Kac drums I & II to demonstrate identical sound spectra from different geometries. * No frameworks, build steps, or dependencies. Repo and tests:…
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