Oracle SQL中的分区排序

某种程度上，我正在获取之前（BLAB）的数据...但是没有数据（ALAB）....
因此，病人通常在手术前和手术后获得实验室我的代码能够捕捉德前而不是后....Oracle SQL中的分区排序

WITH BLAB AS 
(
    SELECT /*+PARALLEL*/ 
     PAT.PATID_CD, 
     PAT.NOTED_DT, 
     LAB.COLLECTION_DT, 
     LAB.RESULT_DE, 
     LAB.UNI_LAB_CD, 
     LAB.PROCEDURE_DE, 
     RANK() OVER (PARTITION BY LAB.PATID_CD, PAT.NOTED_DT ORDER BY LAB.COLLECTION_DT DESC) AS RNK 
    FROM KPHC_PROBLEM_LIST_CN PAT 
    LEFT OUTER JOIN LAB 
     ON 
     PAT.PATID_CD = LAB.PATID_CD 
     AND LAB.REGION_CD = PAT.REGION_CD 
     AND LAB.REGION_CD ='CN' 
     AND LAB.COLLECTION_DT BETWEEN TO_DATE ('01-JAN-12') AND TO_DATE ('01-JAN-16') 
     AND (PROCEDURE_DE LIKE '%EGFR%' 
      OR PROCEDURE_DE LIKE '%INR%' 
      OR PROCEDURE_DE LIKE '%HEMOG%' 
      OR PROCEDURE_DE LIKE '%HEMATR%' 
      OR PROCEDURE_DE LIKE '%PLATE%' 
      OR PROCEDURE_DE LIKE '%CRCL%' 
      OR PROCEDURE_DE LIKE '%CREATI%' 
      OR PROCEDURE_DE LIKE '%PTT%' 
      OR PROCEDURE_DE LIKE '%ANTI-XA%') 
     AND LAB.COLLECTION_DT < PAT.NOTED_DT 
) 
, ALAB AS 
(
    SELECT /*+PARALLEL*/ 
     PAT.PATID_CD, 
     PAT.NOTED_DT, 
     LAB.COLLECTION_DT, 
     LAB.RESULT_DE, 
     LAB.UNI_LAB_CD, 
     LAB.PROCEDURE_DE, 
     RANK() OVER (PARTITION BY LAB.PATID_CD, PAT.NOTED_DT ORDER BY LAB.COLLECTION_DT ASC) AS RNK 
    FROM KPHC_PROBLEM_LIST_CN PAT 
    LEFT OUTER JOIN LAB 
     ON 
     PAT.PATID_CD = LAB.PATID_CD 
     AND LAB.REGION_CD = PAT.REGION_CD 
     AND LAB.REGION_CD ='CN' 
     AND LAB.COLLECTION_DT BETWEEN TO_DATE ('01-JAN-12') AND TO_DATE ('01-JAN-16') 
     AND LAB.UNI_LAB_CD = 'HGB_' 
     AND (PROCEDURE_DE LIKE '%EGFR%' 
      OR PROCEDURE_DE LIKE '%INR%' 
      OR PROCEDURE_DE LIKE '%HEMOG%' 
      OR PROCEDURE_DE LIKE '%HEMATR%' 
      OR PROCEDURE_DE LIKE '%PLATE%' 
      OR PROCEDURE_DE LIKE '%CRCL%' 
      OR PROCEDURE_DE LIKE '%CREATI%' 
      OR PROCEDURE_DE LIKE '%PTT%' 
      OR PROCEDURE_DE LIKE '%ANTI-XA%') 
     AND LAB.COLLECTION_DT > PAT.NOTED_DT 
) 
SELECT /*+PARALLEL*/ 
    BLAB.PATID_CD, 
    BLAB.NOTED_DT  AS PROCEDURE_DATE, 
    BLAB.PROCEDURE_DE AS LAB_TYPE, 
    BLAB.COLLECTION_DT AS DATE_TAKEN_AFTER, 
    BLAB.RESULT_DE  AS LAB_BEFORE, 
    ALAB.COLLECTION_DT AS DATE_TAKE_AFTER, 
    ALAB.RESULT_DE  AS LAB_AFTER 
FROM 
    ALAB, 
    BLAB 
WHERE 
    ALAB.PATID_CD = BLAB.PATID_CD 
    AND ALAB.NOTED_DT = BLAB.NOTED_DT 
    AND ALAB.RNK = 1 
    AND BLAB.RNK = 1;