PostgreSQL 9.3 add postgres_fdw extension for accessing remote tables 

-- 安装 postgres_fdw 插件 
CREATE EXTENSION postgres_fdw;
 
-- 创建远程服务 
CREATE SERVER remote_server FOREIGN DATA WRAPPER postgres_fdw;
 
-- 查看远程服务
select * from pg_foreign_server ;
 
-- 修改远程服务 
alter server remote_server options (add hostaddr '11.216.10.215', 
       add port '5432', add dbname 'db_des');
 
-- SERVER赋权 
grant usage on foreign server remote_server to postgres;
 
-- 在本地数据库中创建user mapping 
CREATE USER MAPPING FOR postgres server remote_server options (user 'postgres', password 'xxxxx');
 
-- 同样创建枚举
CREATE TYPE db_enum AS ENUM ('postgres', 'sqlserver', 'mysql');
 
-- 查看枚举类型的oid 
select oid from pg_type where typname='db_enum';
 
-- 创建外部表developer_month_orders_data
CREATE FOREIGN TABLE developer_month_orders_data(
 id integer not null,
 developer_user_id integer,
 package_id integer,
 order_month date,
 create_datetime timestamp
) SERVER remote_server options (schema_name 'public',table_name 'developer_month_orders_data');
 
-- 查看外部表 
select * from developer_month_orders_data;

drop user mapping for postgres server server_remote ; 
drop server server_remote; 
drop extension postgres_fdw ; 
drop foreign table test1;

create extension postgres_fdw;

create server server_remote_rudy_01 foreign data wrapper postgres_fdw options(host ‘192.168.11.44',port ‘5432',dbname ‘vsphere_info');

select * from pg_foreign_server ;**

create user mapping for postgres server server_remote_rudy_01 options(user ‘vsphere',password ‘viadmin');

CREATE FOREIGN TABLE v1_cost(sample_time TIMESTAMP,datacenter_id int4,host_id int4 ,cost NUMERIC) server server_remote_rudy_01 options (schema_name ‘public',table_name ‘vi_cost');

IMPORT FOREIGN SCHEMA public FROM SERVER server_remote_rudy_01 INTO public;
IMPORT FOREIGN SCHEMA public limit to(t1) FROM SERVER server_remote_rudy_01 INTO public;