ISO SQL TRIGGER syntax

TODO what is the standard compliant syntax?

PostgreSQL requires you to define a SQL stored procedure: stackoverflow.com/questions/28149494/is-it-possible-to-create-trigger-without-execute-procedure-in-postgresql Their syntax may be standard compliant, not sure about the EXECUTE part. Their docs: www.postgresql.org/docs/current/sql-createtrigger.html

SQLite does not support SQL stored procedures at all, so maybe that's why they can't be standard compliant here: stackoverflow.com/questions/3335162/creating-stored-procedure-in-sqlite

SQL:1999 11.38 covers "Trigger definition". The Abstract syntax tree starts with the CREATE TRIGGER and ends in:

This is defined at 13.5 "SQL procedure statement", but that is humongous and I'm not sure what it is at all.