数据库链 create database link l2 connect to用户名 identified by口令 using linko812 select from depaL2 select ename, tel from emp, dep(aL2 where emp. dno-dep dno SHOME/network/admin/tnsname. ora数据库链 create database link L2 connect to 用户名 identified by 口令 using `linko8i2` ; select * from dep@L2 ; select ename,tel from emp, dep@L2 where emp.dno=dep.dno ; $HOME/network/admin/tnsname.ora