What are sequences in PostgreSQL?

Question

PHP

There is a project written in Zend, when inserted into the database (through the view), there is a certain sequence. What it means, how it works and how to implement it - is not clear.
In another project, with the same database and the same privileges (read: the grants are the same) - the insert into the database simply does not happen. He says he's right. ...
Does it affect it somehow?

Answer 1

Sequences in PostgreSQL - generators of unique sequences of numbers, can be used in a similar way to auto_increment fields in MySQL. Those. create a sequence for the table, when inserting a new record into it in a field that must be unique (primary key), write the value that produces the sequence created for this table.