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SELECT * FROM TB T WHERE SID=(SELECT MIN(SID) FROM TB WHERE ID=T.ID)
SELECT * FROM TB T WHERE SID=(SELECT MIN(SID) FROM TB WHERE ID=T.ID)
select * from tb a
where sid = (
select top 1 sid from tb
where id=a.id
order by sid
)
select * from tb a
where not exists (
select 1 from tb
where id=a.id
and sid< a.sid
)
SELECT * FROM TB
WHERE NOT EXISTS
(SELECT * FROM TB T WHERE T.ID = ID AND T.SID>SID)