如何将行转入 AWS Athena 中的列? [英] How to pivot rows into columns in AWS Athena?

问题描述

我是 AWS Athena 的新手，并试图将一些行转换为列，类似于此 StackOverflow 帖子.

I'm new to AWS Athena and trying to pivot some rows into columns, similar to the top answer in this StackOverflow post.

但是，当我尝试时:

SELECT column1, column2, column3
FROM data
PIVOT
(
  MIN(column3)
  FOR column2 IN ('VALUE1','VALUE2','VALUE3','VALUE4')
)

我收到错误: mismatched input '(' Expecting {',', ')'}(服务:amazonathena；状态代码:400；错误代码:invalidrequestexception

有人知道如何在 AWS Athena 中实现我想要实现的目标吗?

Does anyone know how to accomplish what I am trying to achieve in AWS Athena?

推荐答案

扩展@kadrach 的答案.假设这样的表

Extending @kadrach 's answer. Assuming a table like this

uid | key | value1 | value2
----+-----+--------+--------
 1  |  A  |  10    | 1000
 1  |  B  |  20    | 2000
 2  |  A  |  11    | 1001
 2  |  B  |  21    | 2001

单列 PIVOT 是这样工作的

Single column PIVOT works like this

SELECT
  uid,
  kv1['A'] AS A_v1,
  kv1['B'] AS B_v1
FROM (
  SELECT uid, map_agg(key, value1) kv1
  FROM vtable
  GROUP BY uid
) 

结果:

uid | A_v1 | B_v1 
----+------+-------
 1  |  10  |  20   
 2  |  11  |  21  

多列 PIVOT 是这样工作的

Multi column PIVOT works like this

SELECT
  uid,
  kv1['A'] AS A_v1,
  kv1['B'] AS B_v1,
  kv2['A'] AS A_v2,
  kv2['B'] AS B_v2
FROM (
  SELECT uid,
      map_agg(key, value1) kv1,
      map_agg(key, value2) kv2
  FROM vtable
  GROUP BY uid
) 

结果:

uid | A_v1 | B_v1 | A_v2 | B_v2 
----+------+------+------+-----
 1  |  10  |  20  | 1000 | 2000
 2  |  11  |  21  | 1001 | 2001

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