当前行和上一行之间的秒数差异，并在订单 ID 也使用 google bigquery 匹配时将值存储在单独的列中

Posted 2023-03-25

【中文标题】当前行和上一行之间的秒数差异，并在订单 ID 也使用 google bigquery 匹配时将值存储在单独的列中

【英文标题】：Difference in seconds between current row and previous row and store the value in separate column when order ID also matches using google bigquery

【发布时间】：2016-05-31 22:04:04

【问题描述】：

当订单 ID 也使用 google bigquery 匹配时，我想获取当前行和上一行之间的秒数差异并将值存储在单独的列中。 PS：第 4 行根据第 7 行取差值，因为这是下一个可用的订单 ID （日期字段不是字符串而是时间戳）在我的表 test:product.tab1 例如：

Date                    Order  Difference In Seconds
2016-05-31 11:46:54 UTC 14567   11
2016-05-31 11:46:43 UTC 14567   19
2016-05-31 11:46:24 UTC 14567   20
2016-05-31 11:46:04 UTC 14567    4
2016-05-31 11:46:54 UTC 22455   11
2016-05-31 11:46:43 UTC 24567    0
2016-05-31 11:46:00 UTC 14567    0

【参考方案1】：

试试下面 我建议您查看Window functions

SELECT
  DATE, id,
  IFNULL(TIMESTAMP_TO_SEC(TIMESTAMP(DATE)) -   
         TIMESTAMP_TO_SEC(TIMESTAMP(prev_date))
    , 0) AS Difference_In_Seconds
FROM (
  SELECT  
    DATE, id,
    LEAD(DATE) OVER(PARTITION BY id ORDER BY DATE DESC) AS prev_date
  FROM
    (SELECT STRING(DATE) AS DATE, id FROM [test:product.tab1] )
)
ORDER BY id, DATE DESC

【讨论】：

我试图优化这样的查询 SELECT DATE, id, date - LEAD(DATE) OVER(PARTITION BY id ORDER BY DATE DESC) AS diff FROM (SELECT STRING(DATE) AS date, id FROM [ test:product.tab1] order by id date desc) 但我收到一个错误 - 分析表达式中缺少函数，你知道我为什么不能这样做吗？