[sql] Oracle SQL : timestamps in where clause

I need to look up rows within a particular time frame.

select * 
from TableA 
where startdate >= '12-01-2012 21:24:00' 
  and startdate <= '12-01-2012 21:25:33'

I.e.: I need to look up rows with timestamp precision of SECONDS. How do I achieve this?

FYI: The startdate column is of type TIMESTAMP.

For everyone coming to this thread with fractional seconds in your timestamp use:

to_timestamp('2018-11-03 12:35:20.419000', 'YYYY-MM-DD HH24:MI:SS.FF')