SQL SELECT returns Nothing and Causes trigger to terminate

Question

Question,
I have a trigger that basically say's if this value is true check this 2nd value. if the second value does not exist the trigger bails...and raises an exception. Is there
anything I can use to ensure a value is returned. ..
2nd SQL value.
Select Pointnum from Measurepoint where eqnum = :new.Eqnum;
works fine if there is a result, if no data the whole trigger bails.
Any help appreciated. ...

Answer 1

It's generally helpful to specify the actual exception you're getting rather than just saying "raises an exception". Oracle error numbers and error strings are exceptionally useful debugging tools.
My guess, though is that your actual select statement is more like
Select Pointnum
  Into some_local_variable
  from Measurepoint
where eqnum = :new.Eqnum; which is supposed to return an exception NO_DATA_FOUND if there are no rows found and TOO_MANY_ROWS if more than one row is found. If it is expected that either of these scenarios would be valid, you could simply catch the exception
BEGIN
  Select Pointnum
    Into some_local_variable
    from Measurepoint
   where eqnum = :new.Eqnum;
EXCEPTION
  WHEN no_data_found THEN
    <<do something>>
END;Justin