I had this situation now a few times and was always to lazy to write it down. :/
During my last task within the fabe project I hat to create a validation to check for duplicated entries inside an Interactive Grid.
-- select only if the current row is set to Y
Tip of the day
All those meeting clients (Skype, Zoom, Hangouts ...) can also be used for APEX friends and beer meetups. #beer #orclapex
![]()
During my last task within the fabe project I hat to create a validation to check for duplicated entries inside an Interactive Grid.
Whenever I add "None of the above" twice, an error should occur:
This blog post from Lino Schilde was a good start for my final solution: 
Interactive Grid Validation
Validation of Type: PL/SQL Function (returning Error Text)
Code:
declare
v_cnt number;
begin
v_cnt number;
begin
-- check only if insert or update (not delete "D")
if :APEX$ROW_STATUS in ('C','U') then
if :APEX$ROW_STATUS in ('C','U') then
-- select only if the current row is set to Y
-- positive result if one answer was set to Y
select max(case when none_yn = 'Y' then 1 else 0 end)
into v_cnt
from answer
where question_id = :P301_QUESTION_ID
and answer_id != nvl(:ANSWER_ID,0)
and :NONE_YN = 'Y';
if v_cnt = 1 then
return 'Another answer was already set up with "None of the above". You need to change and save it first.';
end if;
end if;
end;
into v_cnt
from answer
where question_id = :P301_QUESTION_ID
and answer_id != nvl(:ANSWER_ID,0)
and :NONE_YN = 'Y';
if v_cnt = 1 then
return 'Another answer was already set up with "None of the above". You need to change and save it first.';
end if;
end if;
end;
My solution used a "max" aggregation within a "case when" trick to get the right result.
--
--
Tip of the day
All those meeting clients (Skype, Zoom, Hangouts ...) can also be used for APEX friends and beer meetups. #beer #orclapex
