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select count(id)
from t
where (new.from<=t.from and new.to>=t.to) or
(new.from<=t.from and new.to<=t.to) or
(new.from>=t.from and new.to>=t.to)4
select count(id)
from t
where (new.from<=t.from and new.to>=t.to) or
(new.from<=t.from and new.to<=t.to) or
(new.from>=t.from and new.to>=t.to)M
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