As my cat woke me up way too early for a Saturday morning, I decided to put all this extra time (and my ChatGPT Pro subscription) into good use and generated a QR-code generator for PostgreSQL, written as a single pure SQL statement. No external libraries or Postgres extension installation needed! I did this purely for fun and learning, I don’t think this is going to be the best way for generating QR codes in production. - Linux, Oracle, SQL performance tuning and troubleshooting training & writing.