INSERT a number in a column based on other columns OLD INSERTs

Question

In PostgreSQL I have this table... (there is a primary key in the most left side \"timestamp02\" which is not shown in this image, please don\'t bother, its not important fo

Answer 1

In an AFTER INSERT trigger, any changes you make to NEW.time_index will be ignored. The record is already inserted at this point; it's too late to modify it.

Create the trigger as BEFORE INSERT instead.