PostgreSQL 序列增删改

• 创建序列

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; 

• 指定序列（给表的主键指定创建好的序列）

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

• 设置序列自增长从当前最大值开始

SELECT setval('test_mergetable_id_seq', (SELECT MAX(i_id) FROM test_mergetable));

alter sequence test_mergetable_id_seq start with  12;

• 删除序列

drop sequence IF EXISTS test_mergetable_id_seq

• 查看序列

SELECT nextval('test_mergetable_id_seq')