create database link DB_EHR
connect to HDC_EHR
identified by HDC_EHR
using '192.168.20.138/orcl';
create or replace synonym XT_GYDM
for XT_GYDM@DB_EHR;
//手動輸入DBLINK名，密碼，數據庫地址，需要同義詞的表
create database link &dblink_ehr_name
connect to &PRO_EHR IDENTIFIED BY &PRO_PASSWD
using '&db_ehr_url';
create or replace synonym EHR_XT_YLFWJG
for PRO_EHR.XT_YLFWJG@&dblink_ehr_name;