ISO standards are often discussed at PostgreSQL conferences, and whenever possible they try to follow the standards. Sometimes standards are written after Postg

ISO standards are often discussed at PostgreSQL conferences, and whenever possible they try to follow the standards. Sometimes standards are written after PostgreSQL implements a feature, and it some cases it seems like they are even written to accomodate PostgreSQL (eg. the SQL/JSON standard seems to take into consideration that a database might have multiple JSON types just like PostgreSQL) But whenever the topic of standards comes up, someone immediately mentions the high price of the standards, and I think only some of the developers actually have a copy of the SQL standards.