oracle顯示兩個字段相除的結果

SELECT SUM(a.pf_value) totalRating ,COUNT(zy_id) countRating from mic_td_user_pf a   WHERE a.zy_id=199 AND a.pf_type=2spa 顯示結果爲 co totalRating countRating  26       7 SELECT b.countRating ,b.totalRati

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