返回最近添加的记录详细信息的ORACLE SQL

编辑：在DEM的大量帮助下解决了这个问题，我将发布一个截短版本的查询，它现在运行得非常好

            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%'

上述客户有两个种族，虽然WB是最近的，因此第E行中的1是正确的。但是，客户机只记录了一个PCG，但行号在第一行返回2，这可能是我要返回的行。我不知道为什么，但我猜是因为etrich.CLA_SUBJECT_ID在O_PERSONS.PER_ID和PER_ID上连接了两次，这就是为什么它认为该特定字段有两行。然而，即使是这样，有没有办法强制在一行中只显示1？或者我可以用完全不同的方式来做吗？希望这个问题有点道理，如果部分内容不清楚，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%'

在进行联接之前，应应用行号

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%'

---

好的，这似乎是有道理的，但是，我已经尝试运行以下查询，但没有成功说明是否缺少右括号？这与查询运行时的连接有关，正如我在上面所示，但与我尝试按照您的建议创建连接时无关-我将发布我在上面尝试的代码。@bawpie-如果您为子查询别名，则您有一个错误。O_分类种族应该是种族的。PCG子查询也是一样。对不起，我实际上像种族一样尝试过，但仍然收到相同的错误？我将发布这个查询，因为我目前正试图运行它，只是为了举例说明。谢谢@bawpie-你能发布准确的错误消息吗？另外，我注意到在子查询中没有使用*。在这种情况下，您还需要CLA_SUBJECT_ID。最后，您是否在主查询中使用SELECT*？您的问题中显示的查询是否与您正在运行的查询相同？对其进行排序，如果有几个问题我认为我已经进行了排序，将发布实际的工作代码，尽管我不确定它是否真的按照预期工作！

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%'