在 bigquery 中使用 EXISTS 和别名

Question

我只是想通过使用 exists 子句来限制数据，但它似乎无法识别 EXISTS 子句中的别名（就像在 Oracle 中那样）

我正在使用这个 sql

select count(1) from 
 (select distinct 
         case when qp_cguid is null then ssid else qp_cguid end cguid,
         case when qp_vid is null then vid else qp_vid end as visit_id,
         TIMESTAMP_MILLIS(creation_date_time) visit_date_time
      from `zone1.table1` as t1
      where _partitiontime in ( timestamp( '2019-01-01') )
    and case when qp_vid is null then vid else qp_vid end is not null 
    and case when qp_cguid is null then ssid else qp_cguid end is not null 
    and exists
            (
             select 1 from `zone2.ga_temp` AS    ga 
             where ga.cguid = t1.cguid 
  and (t1.visit_date_time between TIMESTAMP_ADD(ga.min_hit_time_utc, INTERVAL -10 SECOND) and TIMESTAMP_ADD(ga.max_hit_time_utc, INTERVAL 10 SECOND))
            )
)      

这给了我这个错误

“在 t1 中找不到名称 cguid”

关于如何解决这个问题的任何想法？

Answer 1

你可以试试这个方法

WITH zone2 AS (
  select cguid from `zone2.ga_temp` AS ga 
),
zone1 AS (
  select distinct 
   case when qp_cguid is null then ssid else qp_cguid end cguid,
   case when qp_vid is null then vid else qp_vid end as visit_id,
   TIMESTAMP_MILLIS(creation_date_time) visit_date_time
  from `zone1.table1` as t1
  where _partitiontime in ( timestamp( '2019-01-01') )
    and case when qp_vid is null then vid else qp_vid end is not null 
    and case when qp_cguid is null then ssid else qp_cguid end is not null 
)
SELECT count(1) FROM zone1 INNER JOIN zone2 ON zone1.cguid = zone2.cguid 
WHERE 
  and (zone1.visit_date_time between TIMESTAMP_ADD(ga.min_hit_time_utc, INTERVAL -10 SECOND) and TIMESTAMP_ADD(ga.max_hit_time_utc, INTERVAL 10 SECOND))