sqlserver merge into

create table #ttt(id int,name nvarchar(10));
merge into #ttt t 
using (select 1 as id ,'eee' as name ) b 
on (t.id = b.id) 
when matched then 
update set t.name = b.name 
when not matched then 
insert(id,name) values(b.id,b.name);

select * from #ttt;

merge into  a
using  b 
on (a.id = b.id) 
when matched then 
update set a.name = b.name 
when not matched then 
insert(id,name) values(b.id,b.name);

select * from a;