Hive 配置单元SQL。跨多个列查找最常用的值

我有以下资料：

name device operating browser
 A     mob      l       c
 A     mob      l       b
 A     mob      l       b
 A     web      w       b
 B     web      w       c
 B     web      w       c
 B     mob      w       c
 B     web      l       b

我想为每列中的每个名称找到最常见的值，结果如下所示：

name device operating browser
 A     mob      l       b
 B     web      w       c

我怎样才能做到这一点？谢谢

这可能会有帮助。 但请注意，子查询并不是很好用的

SELECT
a.name,
(SELECT b.device FROM YOUR_TABLE_NAME b WHERE b.name = a.name GROUP BY device ORDER BY COUNT(b.device) DESC LIMIT 1) AS device,
(SELECT c.operating FROM YOUR_TABLE_NAME c WHERE c.name = a.name GROUP BY operating ORDER BY COUNT(c.operating) DESC LIMIT 1) AS operating,
(SELECT d.browser FROM YOUR_TABLE_NAME d WHERE d.name = a.name GROUP BY browser ORDER BY COUNT(d.browser) DESC LIMIT 1) AS browser
FROM YOUR_TABLE_NAME AS a
GROUP BY a.name

---

对于Hive 0.11+，您可以使用窗口功能，如

rank

：

select name, device, operating, browser
from (
  select *, rank() over (partition by name order by cnt desc) as rnk
  from (
    select name, device, operating, browser, count(*) as cnt
    from yourtable
    group by name, device, operating, browser
  ) t
) t
where rnk = 1

逐步：

计算相同行值的出现次数

将他们排在计数之上，每个名字排在最前面

只过滤那些具有最高计数的

---

注意：如果特定名称中有一个tie，它将返回所有具有相同计数号的行。

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