###HUMAN: Number of unanswered question (zero answers) per month., ###ASSISTANT: SELECT LAST_DATE_OF_MONTH(q.CreationDate), COUNT(q.Id) AS Count FROM Posts AS q WHERE (q.PostTypeId = 1) AND (q.AnswerCount = 0) GROUP BY LAST_DATE_OF_MONTH(q.CreationDate) ORDER BY LAST_DATE_OF_MONTH(q.CreationDate)