How to add one date column and charecter column

Question

hi all,
i have 3 column start_date(date),end_date( date),duration (varchar2)
i am trying to add start_time and duration like this
end_date := to_char(start_time) + duration;
but its showing value_error
how to add one date column and charecter column.
Thanks

Answer 1

you need something that does:
end_date (DATE) := start_date (DATE) + <number of
days> (NUMBER)Not necessarily, because if the duration is just a string representation of a number then it will be implicitly converted to a number and not cause an error
e.g.
SQL> ed
Wrote file afiedt.buf
  1  with t as (select to_date('01/07/2007','DD/MM/YYYY') as start_dt, '3' as duration_days from dual)
  2  -- END OF TEST DATA
  3  select start_dt + duration_days
  4* from t
SQL> /
START_DT+
04-JUL-07