在同一表格中串联BigQuery中具有相同ID的行 [英] Concatenate rows with same id in BigQuery from same table

问题描述

我正在Google bigquery中运行此查询

I am running this query in google bigquery

SELECT rep.key.id as id, te.cmnt as comment
FROM `table` rep, UNNEST(tre) as te
WHERE u_id LIKE 'test'
ORDER BY cts DESC

我正在得到这个

Id                    comment
---------------------------------
5165356444286976      HEloo
5165356444286976      TEST
5165356444286976

我想合并具有相同ID的所有注释，例如，看起来像这样:

I want to merge all comments with same id, for example to look like this:

Id                    comment
---------------------------------
5165356444286976      HEloo, TEST

推荐答案

使用 STRING_AGG():

WITH table AS (
  SELECT 'test' u_id, STRUCT(1 AS id) AS key, [STRUCT('hey' AS cmnt)] AS tre, 3 cts
  UNION ALL 
  SELECT 'test', STRUCT(1), [STRUCT('you')], 2
  UNION ALL 
  SELECT 'test', STRUCT(1), [STRUCT(CAST(null AS STRING))], 1
)


SELECT rep.key.id as id, STRING_AGG(te.cmnt, ', ' ORDER BY cts DESC) AS comments
FROM `table` rep, UNNEST(tre) as te
WHERE u_id LIKE 'test'
GROUP BY id

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