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编辑：在 Dems 的大力帮助下解决了，我将发布查询的截断版本，现在运行良好！

            SELECT
  *

FROM

    O_PERSONS

    /*The below left join returns the most recently added ethnicity classification*/
  LEFT JOIN 

  (SELECT
   ROW_NUMBER() OVER (PARTITION BY O_CLASSIFICATIONS.CLA_SUBJECT_ID ORDER BY O_CLASSIFICATIONS.CLA_DATE_NOTIFIED DESC) AS Sequence_ID,
   O_CLASSIFICATIONS.CLA_CAT_ID,
   O_CLASSIFICATIONS.CLA_SUBJECT_ID
   FROM
   O_CLASSIFICATIONS
   WHERE
   O_CLASSIFICATIONS.CLA_SUBJECT_IND = 'P'
   AND
   O_CLASSIFICATIONS.CLA_TOP_CAT_ID   =  'ETHNIC'
   AND
   O_CLASSIFICATIONS.CLA_CAT_ID <> 'DECLINED'
   ) ETHNIC 
   ON ETHNIC.CLA_SUBJECT_ID = O_PERSONS.PER_ID 
   AND ETHNIC.Sequence_ID = 1

    /*The below left join returns the most recently added PCG classification*/
   LEFT JOIN 

  (SELECT
   ROW_NUMBER() OVER (PARTITION BY O_CLASSIFICATIONS.CLA_SUBJECT_ID ORDER BY O_CLASSIFICATIONS.CLA_DATE_NOTIFIED DESC) AS Sequence_ID,
   O_CLASSIFICATIONS.CLA_CAT_ID,
   O_CLASSIFICATIONS.CLA_SUBJECT_ID
   FROM
   O_CLASSIFICATIONS
   WHERE
   O_CLASSIFICATIONS.CLA_SUBJECT_IND = 'P'
   AND
   O_CLASSIFICATIONS.CLA_TOP_CAT_ID   =  'PRIMARY'
   AND
   O_CLASSIFICATIONS.CLA_CAT_ID <> 'DECLINED'
   ) PCG
   ON PCG.CLA_SUBJECT_ID = O_PERSONS.PER_ID 
   AND PCG.Sequence_ID = 1


  WHERE

   O_PERSONS.PER_ID LIKE 'P%'

我目前正在尝试编写一个查询，它将为我们系统上的客户返回某些详细信息。虽然客户只有一个出生日期、性别和 P ID，但他们可能有多个种族（由于数据质量）以及客户群体（这更合理，因为客户的需求可能会发生变化）。但是，对于这些特定项目，我只对最近添加的种族或客户群体感兴趣。下面我编写了一个查询，它为种族和客户组分配了一个行号，并计划只返回等于 1 的行号，因为这些通常是最新的。但是，我遇到了 2 个问题，其中一个我可以解决，另一个我不太确定。

首先，一些客户不会记录种族或客户群体。运行以下查询时，它们返回非常奇数的行号（通常为数千）。但是，我知道在我的“位置”中我可以指定如果客户组或种族为空则返回一行（因为这些将是需要解决的数据质量案例）。

第二个问题有点棘手，我将尝试用下表来表示。请注意，为了便于输入和理解，我对表格进行了缩写。

  P ID Ethnicity   PCG RN E RN P
  P1   WB          OV  1    2 
  P1   WI          OV  2    1

上述客户有两个种族，尽管 WB 是最新的（因此 E 行中的 1 是正确的）。但是，客户端只记录了一个 PCG，但行号在第一行返回 2（可以说是我想要返回的行）。我不确定为什么，虽然我猜是因为 ETHNIC.CLA_SUBJECT_ID 加入了 O_PERSONS.PER_ID 并且 PER_ID 出现了两次，这就是为什么它认为该特定字段有两行。但是，即使是这样，有没有办法强制只有 1 出现在一行中？或者我可以用完全不同的方式做到这一点吗？希望这个查询有意义，如果部分不清楚，请道歉。谢谢，

                         SELECT
          O_PERSONS.PER_ID as "P ID",
          olm_bo.get_per_name(O_PERSONS.PER_ID) as "Full Name",
          O_PERSONS.PER_BIRTH_DATE as "Date of Birth",
          case 
            when O_PERSONS.PER_DECEASED_DATE is null then FLOOR(MONTHS_BETWEEN(sysdate,O_PERSONS.PER_BIRTH_DATE)/12) 
            else FLOOR(MONTHS_BETWEEN(O_PERSONS.PER_DECEASED_DATE,O_PERSONS.PER_BIRTH_DATE)/12) 
          end as "Age",
          O_PERSONS.PER_DECEASED_DATE as "Date Deceased",
          olm_bo.get_gender_desc('P', O_PERSONS.PER_GENDER) as "Gender",
          CASE 
            WHEN ETHNIC.CLA_CAT_ID IN ('C1','C2','C3','C4','ABAN','AIND','AOTH','APKN') THEN 'Asian or Asian British'
            ELSE NULL
          End as "Ethnicity - Top" ,
          CASE 
            WHEN ETHNIC.CLA_CAT_ID IN ('BAFR','D2') THEN 'African'
            ELSE NULL
          End as "Ethnicity - Detail" ,
          CASE 
            WHEN PCG.CLA_CAT_ID IN ('ASYLUM','REFUGEE') THEN 'Asylum Seeker/Refugee'
            ELSE NULL
          End as "PCG",
          CASE 
            WHEN PCG.CLA_CAT_ID IN ('ASYLUM','REFUGEE') THEN 'Asylum Seeker/Refugee'
            ELSE NULL
          End as "PCG - Top",
          CASE 
            WHEN PCG.CLA_CAT_ID IN ('ASYLUM','REFUGEE') THEN 'Asylum Seeker/Refugee'
            ELSE NULL
          End as "PCG - DETAIL",

          to_char(row_number() over(PARTITION BY  ETHNIC.CLA_SUBJECT_ID ORDER BY abs(sysdate - ETHNIC.CLA_DATE_NOTIFIED) asc)) as "Row Number E",
          to_char(row_number() over(PARTITION BY  PCG.CLA_SUBJECT_ID ORDER BY abs(sysdate - PCG.CLA_DATE_NOTIFIED) asc))as "Row Number P"

        FROM

          O_PERSONS

          LEFT JOIN O_CLASSIFICATIONS ETHNIC ON ETHNIC.CLA_SUBJECT_ID = O_PERSONS.PER_ID 
          AND ETHNIC.CLA_SUBJECT_IND = 'P'
          AND ETHNIC.CLA_TOP_CAT_ID   =  'ETHNIC'
          AND ETHNIC.CLA_CAT_ID <> 'DECLINED'

          LEFT JOIN O_CLASSIFICATIONS PCG ON PCG.CLA_SUBJECT_ID = O_PERSONS.PER_ID 
          AND PCG.CLA_SUBJECT_IND = 'P'
          AND PCG.CLA_TOP_CAT_ID   =  'PRIMARY'
          AND PCG.CLA_CAT_ID <> 'DECLINED'

          WHERE
          /*Following line excludes any clients whose is less than 18)*/
            O_PERSONS.PER_BIRTH_DATE > trunc(add_months(O_PERSONS.PER_BIRTH_DATE,-216))
            AND  O_PERSONS.PER_ID LIKE 'P%'
4

1 回答 1

1

您应该在加入ROW_NUMBER() 之前申请。

SELECT
  *     -- Your calculations here, '*' used for brevity
FROM
  O_PERSONS
LEFT JOIN
(
  SELECT
    ROW_NUMBER() OVER (PARTITION BY CLA_SUBJECT_ID ORDER BY CLA_DATE_NOTIFIED DESC) AS sequence_id,
    *
  FROM
    O_CLASSIFICATIONS
  WHERE
        CLA_SUBJECT_IND =  'P'
    AND CLA_TOP_CAT_ID  =  'ETHNIC'
    AND CLA_CAT_ID      <> 'DECLINED'
)
  ETHNIC
    ON  ETHNIC.CLA_SUBJECT_ID = O_PERSONS.PER_ID
    AND ETHNIC.sequence_id    = 1
LEFT JOIN
(
  SELECT
    ROW_NUMBER() OVER (PARTITION BY CLA_SUBJECT_ID ORDER BY CLA_DATE_NOTIFIED DESC) AS sequence_id,
    *
  FROM
    O_CLASSIFICATIONS
  WHERE
        CLA_SUBJECT_IND =  'P'
    AND CLA_TOP_CAT_ID  =  'PRIMARY'
    AND CLA_CAT_ID      <> 'DECLINED'
)
  PCG
    ON  PCG.CLA_SUBJECT_ID = O_PERSONS.PER_ID
    AND PCG.sequence_id    = 1
WHERE
     /*Following line excludes any clients whose is less than 18)*/
     O_PERSONS.PER_BIRTH_DATE > trunc(add_months(O_PERSONS.PER_BIRTH_DATE,-216))
AND  O_PERSONS.PER_ID LIKE 'P%'
于 2012-04-11T12:33:17.333 回答