hadoop - HiveSQLException:无法识别表达式规范中 'SELECT' 'MAX' '('附近的输入

Question

我正在尝试获得一个计数的最大值。代码如下

SELECT coachID, COUNT(coachID)
FROM coaches_awards GROUP BY coachID
HAVING COUNT(coachID) = 
(
   SELECT MAX(t2.awards)
    FROM (
             SELECT coachID, count(coachID) as awards
             FROM coaches_awards
             GROUP BY coachID
          ) t2
);

然而，某些事情一直在失败。内部查询工作并给出我想要的答案，如果内部查询被所需的数字替换，外部查询将工作。所以我假设我犯了一些语法错误。

我要去哪里错了？

Answer 1

如果您只想查找一行，为什么不这样做:

SELECT coachID, COUNT(coachID) as cnt
FROM coaches_awards
GROUP BY coachID
ORDER BY cnt DESC
LIMIT 1;

如果您想要联系，请使用RANK()或DENSE_RANK():

SELECT ca.*
FROM (SELECT coachID, COUNT(*) as cnt,
             RANK() OVER (ORDER BY COUNT(*) DESC) as seqnum
      FROM coaches_awards
      GROUP BY coachID
     ) ca
WHERE seqnum = 1;