alter session set time_zone = '+3:0';

select dbtimezone, sessiontimezone from dual;


alter session set time_zone = dbtimezone;

select dbtimezone, sessiontimezone from dual;


alter session set time_zone = local;

select dbtimezone, sessiontimezone from dual;


alter session set time_zone = 'Asia/Seoul';

select dbtimezone, sessiontimezone from dual;

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