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update C
set lastpoint=c.id
from map_roadinfo a,@nonode b,@nonode c
where a.idmin=b.PID and a.idmax=c.PID and b.id=@SNO
--try
update
b
set
lastpoint=c.id
from
map_roadinfo a,@nonode b,@nonode c
where
a.idmin=b.PID and a.idmax=c.PID and b.id=@SNO