@numRows = count_by_sql("SELECT COUNT(DISTINCT Opinions.id), SUM
(Ratings.score) as score_sum FROM Opinions
LEFT JOIN Ratings ON Opinions.id =
Ratings.opinion_id WHERE score_sum > 20")
Will return us the SUM of COUNT(DISTINCT Opinions.id) AND SUM
(Ratings.score).
But we only need the value of COUNT(DISTINCT Opinions.id)
Is there a way to achieve that in rails?
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