> On 25 Sep 2017, at 09:51 , hvjunk <hvj...@gmail.com> wrote:
>
> Good day,
>
> See the sequence below, Postgresql 9.6.5 on Debian using the postgresql
> repository.
>
> Question: Is this expected behaviour?
I guess it might be, but the “bug” is that the excessive/unused sequence isn’t
removed:
test=# \d test_serial
Table "public.test_serial"
Column | Type | Modifiers
------------+----------------------+-----------------------------------------------------------
teststring | character varying(5) |
uid | bigint | not null default
nextval('test_serial_uid_seq'::regclass)
>
>
>
> postgres@tracsdbhvt01:~$ cat test-serial.sql
> create database test;
> \c test
> create table test_serial ( teststring varchar(5));
> alter table test_serial add column if not exists uid BIGSERIAL;
> alter table test_serial add column if not exists uid BIGSERIAL;
> \d
>
> postgres@tracsdbhvt01:~$ psql -p 5433 < test-serial.sql
> CREATE DATABASE
> You are now connected to database "test" as user "postgres".
> CREATE TABLE
> ALTER TABLE
> NOTICE: column "uid" of relation "test_serial" already exists, skipping
> ALTER TABLE
> List of relations
> Schema | Name | Type | Owner
> --------+----------------------+----------+----------
> public | test_serial | table | postgres
> public | test_serial_uid_seq | sequence | postgres
> public | test_serial_uid_seq1 | sequence | postgres
> (3 rows)
>
>
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