lsnrctl status     //查看Service name

sqlplus sys/oracle@cdb1 as sysdba    //登录cdb

col name format a16
col pdb format a16
select name,pdb from v$services;

alter session set container=pdb_easyee;

select to_char(sysdate,'yyyy-mm-dd hh24:mi:ss') time from dual;

select dbtimezone from dual;

select SESSIONTIMEZONE from dual;