#ean

• Corrected PostgreSQL EAN Functions

  https://justatheory.com/2006/05/postgres-ean-validation

• My First C: A GTIN Data Type for PostgreSQL

  https://justatheory.com/2006/09/postgres-gtin-0.01

• Validating UPCs with PL/pgSQL

  https://justatheory.com/2006/05/plpgsql-upc-validation