plz do this way

        create table #temp(
name varchar (20),
address varchar (20),
position varchar (20),
nametype1 varchar (20),
nametype2 varchar (20),
nameval varchar(20))

insert into #temp(nametype1,nametype2)values(
'BA', 'AB')

select * from #temp

update #temp set nameval=case when nametype1=nametype2 then '1' else '2'
end

select * from #temp