Question

我有一个查询，它获取由三个字段分组的内部选择的最大计数。现在我不想只有这个数字，而是整行。我无法弄明白。以下是返回数字的查询：

SELECT MAX (count) FROM
(SELECT COUNT (*) AS count,
        field1,
        field2,
        field3   
    FROM someScheme.someTable
    GROUP BY field1, field2, field3
     ) AS counts

Answer 1

使用order by和limit：

SELECT COUNT(*) AS count, field1, field2, field3   
FROM someScheme.someTable
GROUP BY field1, field2, field3
ORDER BY COUNT(*) DESC
LIMIT 1;

注意：这只返回一个最大值的例子。

如果你想要所有可能的行，那就更复杂了：

SELECT COUNT(*) AS count, field1, field2, field3   
FROM someScheme.someTable
GROUP BY field1, field2, field3
HAVING COUNT(*) = (SELECT MAX(cnt)
                   FROM (SELECT COUNT(*) AS cnt 
                         FROM someScheme.someTable
                         GROUP BY field1, field2, field3
                        ) t
                  );

如何使用内部选择获取max（count（*））行

1 个答案: