Sequence PostgreSQL

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postgres=# -- Creation of a sequence
postgres=#
postgres=# CREATE SEQUENCE shipments_ship_id_seq START 200 INCREMENT 1;
CREATE SEQUENCE
postgres=#
postgres=# -- Select the next number from a sequence with the nextval() function:
postgres=#
postgres=# SELECT nextval ('shipments_ship_id_seq');
 nextval
---------
     200
(1 row)
postgres=#
postgres=#
postgres=# drop sequence shipments_ship_id_seq;
DROP SEQUENCE
postgres=#