sql - 在 BigQuery SQL 问题中支持 UNION ALL 函数

Question

我怎样才能让这个查询在 GCP 大查询上运行而不会出错：

“不支持引用其他表的相关子查询，除非它们可以去相关，例如通过将它们转换为有效的 JOIN。”

---

你们有什么想法我该如何解决这个冲突？

 Select
  x.subject_id as PatientId
  ,sum(x.BPS) as sbp
  ,sum(x.RR) as rr
  ,sum(x.sepsis) as sepsis
From (
  Select
    c.subject_id
    ,(
    Select  (Case
      WHEN cast(c2.value as numeric) <= 90 THEN 3
            WHEN cast(c2.value as numeric) >= 91 AND cast(c2.value as numeric) <= 100 THEN 2
            WHEN cast(c2.value as numeric) >= 101 AND cast(c2.value as numeric) < 110 THEN 1
            WHEN cast(c2.value as numeric) >= 111 AND cast(c2.value as numeric) < 219 THEN 0
      WHEN cast(c2.value as numeric) >= 220 THEN 3
      else 0
         End)
    From    chartevents c2
    Where   c2.subject_id = c.subject_id
        and c2.itemid = c.itemid
        limit 1
    ) as BPS
    ,0 as RR
  ,0 as sepsis
  From
    chartevents c
  Where
    c.itemid = 220050
  Group by
    c.subject_id
    ,c.itemid
  Union all
  Select
    c.subject_id
    ,0 as BPS
    ,(Select  (Case
      WHEN cast(c2.value as numeric) <= 8 THEN 3
            WHEN cast(c2.value as numeric) >= 9 AND cast(c2.value as numeric) <= 11 THEN 1
            WHEN cast(c2.value as numeric) >= 12 AND cast(c2.value as numeric) <= 20 THEN 0
            WHEN cast(c2.value as numeric) >= 21 AND cast(c2.value as numeric) <= 24 THEN 2
            WHEN cast(c2.value as numeric) >= 25 THEN 3
      else 0
         End)
    From    chartevents c2
    Where   c2.subject_id = c.subject_id
        and c2.itemid = c.itemid
       limit 1
   ) as RR
  ,0 as sepsis
  From
    chartevents c
  Where
    c.itemid = 220210
  Group by
    c.subject_id
    ,c.itemid
  Union all
    Select
        c.subject_id
        ,0 as BPS
        ,0 as RR
      ,(case when exists (
                      Select  1
                      From    diagnoses_icd d
                      Where   d.subject_id = c.subject_id
                              and d.icd9_code like '%99591%'
                      )
              then 1
              else 0
        end) as sepsis
      From
        chartevents c
      Where
        c.itemid = 228334
      Group by
        c.subject_id
        ,c.itemid
) x
Group by
   x.subject_id
   limit 5
;

期望的输出：

| 患者 ID | sbp | rr | 败血症|

| 1 | 0 | 0 | 0 |
| 2 | 2 | 3 | 1 |

Answer 1

这可能是由于chartevents c2子查询而发生的。尝试将它们转换为ARRAY_AGG构造。

这将产生错误：

SELECT
  c.subject_id,
  (
      SELECT c2.value * 2
      FROM chartevents c2
      WHERE c2.subject_id = c.subject_id
        AND c2.itemid = c.itemid
      LIMIT 1
  ) as BPS
FROM
  chartevents c

这将起作用：

SELECT
  c.subject_id,
  ARRAY_AGG(c2.value * 2 LIMIT 1)[OFFSET(0)] AS BPS
FROM chartevents AS c
JOIN chartevents AS c2
ON c2.subject_id = c.subject_id
  AND c2.itemid = c.itemid