BigQuery QUALITY 子句可用吗？嵌套查询需要单个输出

Question

QUALIFY 子句在 BQ 中可用吗？我正在尝试运行下面的查询以尝试提取单个最流行的 Route 值，以便我可以将它嵌套在另一个查询的 WHERE 子句中：

WITH table AS (
    SELECT 'Point A' as Origin, 'Point B' as Destination, A as Route
    FROM UNNEST(['Highway', 'Backroad', 'Highway', 'Highway', 'Backroad']) as A
)


SELECT
    DISTINCT Route
FROM
   table
WHERE 
    Origin = 'Point A' AND
    Destination = 'Point B'
QUALIFY RANK() OVER (PARTITION BY Origin, Destination ORDER BY COUNT(*) DESC) = 1

What I have

What I want (most commonly used route)

并收到此一般性错误：

Error running query An internal error occurred and the request could not be completed. This is usually caused by a transient issue. Retrying the job with back-off as described in the BigQuery SLA should solve the problem: https://cloud.google.com/bigquery/sla. If the error continues to occur please contact support at https://cloud.google.com/support. Error: 80038528

如果有更好的方法，请告诉我。我需要一种在评估最流行的值后提取单个行和列的有效方法，理想情况下没有嵌套查询。

Here is the BQ QUALIFY clause documentation.

Answer 1

考虑以下方法

SELECT
  DISTINCT Route
FROM
  table
WHERE 
  Origin = 'Point A' AND
  Destination = 'Point B'
GROUP BY 
  Origin, Destination, Route 
QUALIFY 
  RANK() OVER (PARTITION BY Origin, Destination ORDER BY COUNT(*) DESC) = 1

BigQuery QUALITY 子句可用吗？嵌套查询需要单个输出

BigQuery QUALITY clause available? Needing single output for nested query

sql

where-clause

google-bigquery

google-cloud-platform