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select name,max(time) from tb group by name
select a.*
from tb a
inner join
(select name,
max([time]) 'maxtime'
from tb
group by name) b on a.name=b.name and a.[time]=b.maxtime
select * from tb t where time=(select max(time) from tb where name=t.name)
select a.* from tb a inner join (select name,max(name) from tb group by name) as b on
a.name=b.name
select * from tb t where not exists(select 1 from tb where name=t.name and time>t.time)