begin
  execute immediate 'DROP TABLE wb_rt_time_src CASCADE CONSTRAINTS';
exception
  when others
  then
    null;
end;
/
commit;

begin
  execute immediate 'DROP SEQUENCE wb_rt_week_seq';
exception
  when others
  then
    null;
end;
/
commit;

begin
  execute immediate 'DROP SEQUENCE wb_rt_month_seq';
exception
  when others
  then
    null;
end;
/
commit;

begin
  execute immediate 'DROP SEQUENCE wb_rt_quarter_seq';
exception
  when others
  then
    null;
end;
/
commit;

begin
  execute immediate 'DROP SEQUENCE wb_rt_year_seq';
exception
  when others
  then
    null;
end;
/
commit;