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create trigger myIns_Trigger on myTable
instead of insert
insert into myTable (field1, field2, field3)
select field1, field2, case field3 when '' then null else field3 end
create trigger myUpd_Trigger on myTable
instead of update
set field2 = field2,
field3 = case field 3 when '' then null else field3 end
from myTable mt
join inserted i
on mt.field1 = i.field1
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