动态计算偏移量

Posted 2021-04-11

我想根据组中的项目数动态设置上一个偏移量。例如

T 
| make-series value = sum(value) on timestamp from .. to .. step 5m by customer
| summarize by bin(timestamp,1h), customer
| extend prev_value = prev(value,<offset>)

此处的偏移量应等于独立客户的数量。如何动态计算此偏移量

答案

如果可以将查询分为多个部分，则可以使用toscalar函数来获取唯一身份客户的数量。

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这就是我的方法

toscalar

您可以找到示例let tab_series = T | make-series value = sum(value) on timestamp from .. to .. step 5m by customer ; let no_of_distinct_customers = toscalar(tab_series | distinct customer | summarize count()) ; tab_series | summarize by bin(timestamp, 1h), customer | extend prev_value = prev(value, no_of_distinct_customers) 。