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分享update t k
set name=null
where id>(select min(id) from t where name=k.name)
update t
set name=null
where id>(select min(id) from t k where name=k.name)
update t k
set name=null
where id>(select min(id) from t where name=k.name)update t k
set name=null
where id>(select min(id) from t where name=k.name)