CREATE SEQUENCE if not exists test_mergetable_id_seq
INCREMENT 1
MINVALUE 1
MAXVALUE 999999999
START 1
CACHE 1;
//或者： 
create sequence if not exists test_mergetable_id_seq increment by 1 minvalue 1 no maxvalue start with 1; 

alter table test_mergetable alter column "i_id" set default nextval('test_mergetable_id_seq');

SELECT setval('test_mergetable_id_seq', (SELECT MAX(i_id) FROM test_mergetable));
alter sequence test_mergetable_id_seq start with 12;

drop sequence IF EXISTS test_mergetable_id_seq

SELECT nextval('test_mergetable_id_seq')

create user user1;

alter user report with password 'password';

grant usage on schema schema1 to user1;
grant usage on schema schema2 to user1;

set search_path = "$user",user1,user2

grant all on schema schema1 to user1;

grant all on all tables in schema schema1 to user1;

grant all on all tables in schema schema1 to user1;

grant select on schema2.table1           to user1;

revoke all on all tables in schema schema1 from user1;

alter user user1 set search_path="$user",user1,user2;