How many people tweet in French who speak English?
> Person.select('DISTINCT
people.id').joins(:tweets).merge(Tweet.where(:language_id =>
3)).where(:language_id => 1).count
(0.8ms) SELECT COUNT(DISTINCT people.id) FROM "people" INNER JOIN
"tweets" ON "tweets"."person_id" = "people"."id" WHERE
"tweets"."language_id" = 3 AND "people"."language_id" = 1
=> 6
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