Question

如何在WHERE子句中聚合尾随的12个月（TTM）总使用CASE语句？谷歌-大量查询

这是我的查询...

SELECT
  clientid,
  clientname,
  year(revrecdate)*100 + month(revrecdate) as Period, *** NAMES the TTM period
  count(revrecdate) as Jobs,
  sum(profit) as Profits
FROM 
  oiafd.JobProfit
WHERE
  revrecdate >= '2010-12-01 00:00:00'
  and clientid = '2KOOLPDX'
  and CASE  WHEN month(revrecdate) = 1
            THEN(revrecdate <= timestamp(concat(string(year(revrecdate)),'-01-31')) and 
              revrecdate >= timestamp(concat(string(year(revrecdate)-1),'-02-01')))
            WHEN month(revrecdate) = 2
            THEN(revrecdate <= timestamp(concat(string(year(revrecdate)),'-02-28')) and 
              revrecdate >= timestamp(concat(string(year(revrecdate)-1),'-03-01')))

Answer 1

回答有关将CASE语句的概念转换为适用于BigQuery的问题的问题：您可以使用IF函数将每个案例分解为WHERE中的单独子句。

这样的事情会起作用：

...
WHERE
  revrecdate >= '2010-12-01 00:00:00'
  and clientid = '2KOOLPDX'
  and IF(month(revrecdate) = 1,
         revrecdate <= timestamp(concat(string(year(revrecdate)),'-01-31')) and 
         revrecdate >= timestamp(concat(string(year(revrecdate)-1),'-02-01')),
         true)
  and IF(month(revrecdate) = 2,
         revrecdate <= timestamp(concat(string(year(revrecdate)),'-02-28')) and 
         revrecdate >= timestamp(concat(string(year(revrecdate)-1),'-03-01')),
         true)

有关IF（）的详细信息，请参阅https://developers.google.com/bigquery/query-reference#otherfunctions。

在google-bigquery中追踪12个月的聚合

1 个答案: