最小分数

Question

我正在检查一些住房数据，并希望列表中的邮政编码以及返回的计数值（对于看起来最少的邮政编码都是相同的）。但是，当我运行以下查询时，我只得到答案而不是相关的邮政编码（从检查，我知道有多个邮政编码具有相同的最小值）。我确实认识到这是由GROUP BY函数引起的，它实际上是＆＃34;分组＆＃34;代码按最小值，但我不确定如何获得具有相关最小值的所有zipcode的列表。

SELECT MIN(counted)
FROM (SELECT zipcode, count(*) AS counted
  FROM housingprices
  GROUP BY zipcode)
AS COUNTS

Answer 1

我认为你似乎想要：

SELECT zipcode, count(*) AS counted
FROM housingprices
GROUP BY zipcode
HAVING count(*) = (SELECT MIN(counted)
                   FROM (SELECT count(*) AS counted
                         FROM housingprices
                         GROUP BY zipcode)
                  );