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How to send such a query to database server from Rake task without removing record-by-record in “each” loop?
delete from data
where uuid in (
select uuid
from data
group by uuid, raw, recdate
having count(*)>1
);
ActiveRecord has the
delete_allmethod for you. Note that it does not call the destroy callbacks. http://api.rubyonrails.org/classes/ActiveRecord/Relation.html#method-i-delete_all