[英]Is there a way to use a declared variable in BigQuery SQL with ROWS BETWEEN 'variable' PRECEDING AND CURRENT ROW in a window function?
当前收到错误“窗口框架表达式必须是 [x:x] 处的文字或参数”,仅使用数字 5 就可以正常工作,但在我的脚本中经常使用它。
DECLARE variable INT64;
SET variable = 5;
SELECT col1, value, time,
CASE
WHEN "Bla" = "Bla"
THEN MIN(value) OVER (PARTITION BY col1 ORDER BY time ROWS BETWEEN variable PRECEDING AND CURRENT ROW)
ELSE NULL
END
AS MinVal
FROM data
您可以使用 execute immediate 来执行动态查询。 例如。 下面的查询在 over 子句中使用了 var。
declare var int64 default 5;
execute immediate
'select min(1) over(order by street_number ROWS BETWEEN '||var||' PRECEDING AND CURRENT ROW) from' ||'`bigquery-public-data.austin_311.311_service_requests` limit 100'
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