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declare @t as table
(
a varchar(10),
b varchar(10),
c varchar(10)
)
insert into @t
select 'aa','s','5'
insert into @t
select 'bb','s','6'
insert into @t
select 'aa','m','3'
insert into @t
select 'bb','l','1'
;with t as
(
select ROW_NUMBER() over(partition by a order by b,c) r, a,b,c
from @t
)
select
a = case when r = 1 then a
else '' end,
b,
c
from t