create trigger [dbo].[test] on [dbo].[invoice]
for insert
as
begin
update Invoice
set Trader_Status = 'OPEN'
where Invoice_Id in ( select Invoice_Id from inserted where Invoice_Status = 'PENDING' )
update Invoice
set Trader_Status = 'BLOCKED'
where Invoice_Id in ( select Invoice_Id from inserted where Invoice_Status = 'OVERDUE' )
end
Nota che questo gestirà più di una riga inserita da una singola istruzione.