E-Notebook: Start a session

If you need to run a script or a query , a session can be strted by running the query: 

declare
    TZB number;
    sKey NUMBER;
begin       
    select -1*to_number(substr(tz_offset(sessiontimezone),1,1)||'1')*(60*to_number(substr(tz_offset(sessiontimezone),2,2))+to_number(substr(tz_offset(sessiontimezone),5,2))) into tzb from dual;
        start_session(sKey, 1, TZB);end;
/