On 2019-02-20 13:47, PG Doc comments form wrote:
> CREATE TABLE tablename (
> colname SERIAL
> );
>
> is equivalent to
>
> CREATE SEQUENCE tablename_colname_seq;
> CREATE TABLE tablename (
> colname integer NOT NULL DEFAULT nextval('tablename_colname_seq')
> );
> ALTER SEQUENCE tablename_colname_seq OWNED BY tablename.colname;
>
> Since Postgres 10, the datatype of the automatically-created sequence
> matches the datatype of the serial column. But the default type for
> CREATE SEQUENCE remains as bigint. So the second block should start with
> the line
>
> CREATE SEQUENCE tablename_colname_seq AS INTEGER;
fixed
--
Peter Eisentraut http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services