[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?
當前收到錯誤“窗口框架表達式必須是 [x:x] 處的文字或參數”,僅使用數字 5 就可以正常工作,但在我的腳本中經常使用它。
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 來執行動態查詢。 例如。 下面的查詢在 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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