PostgreSQL 序列增删改案例
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’)
补充：pgsql的schema对用户授权，单个用户跨schema增删改查操作
–创建用户
create user user1;
–修改密码
alter user report with password ‘password’;
–授权查询权限
grant usage on schema schema1 to user1;
grant usage on schema schema2 to user1;
修改search_path可跨schema操作
set search_path = “$user”,user1,user2
–授权schema:schema1给user1权限 这个权限太大需要慎用
grant all on schema schema1 to user1;
–授权schema的表权限给user1 用户权限太多需慎用
grant all on all tables in schema schema1 to user1;
–授权schema的表权限给user1 用户权限太多需慎用
grant all on all tables in schema schema1 to user1;
–授权某个schema的单个表查权限
grant select on schema2.table1 to user1;
–收回所有授权
revoke all on all tables in schema schema1 from user1;
–为某个特定用户设置search_path
alter user user1 set search_path=”$user”,user1,user2;
以上为个人经验，希望能给大家一个参考，也希望大家多多支持。如有错误或未考虑完全的地方，望不吝赐教。
