Question

我正在Google bigquery中运行此查询

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：

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

Answer 1

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

在同一表格中串联BigQuery中具有相同ID的行

1 个答案: