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SQL code:

create table OutgoingNotice (
OutgoingNoticeId NVARCHAR2(15) not null,
CompanyId CHAR(32) not null,
DateCreated Date,
constraint PK_OUTGOINGNOTICE primary key (OutgoingNoticeId)
);

create trigger Trigger_OGNotice_Insert before insert
on OutgoingNotice for each row
declare
newid nvarchar(15);
curMonthMaxId nvarchar(15);
begin
select og.OutgoingNoticeId into curMonthMaxId from OutgoingNotice og order by OutgoingNoticeId
where TO_CHAR(og.datecreated, 'YYYY-MM') = TO_CHAR(:new.datecreated, 'YYYY-MM') and og.CompanyId = :new.CompanyId and rownum = 1

if curMonthMaxId is null
then
newid = CONCAT(TO_CHAR(:new.datecreated, 'YYYY-MM'), '01')
else
newid = CONCAT(TO_CHAR(:new.datecreated, 'YYYY-MM'), TO_CHAR(TO_NUMBER(SUBSTR(curMonthMaxId, 6), '9999'), '9999'))
end if;

:new.OutgoingNoticeId = newid;
end;


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