ROW_NUMBER爲最常用的返回所有行

Question

我有這個疑問

select ProductID, ARPVend, count(distinct whsecode) as RN 
    FROM 
     (select pa.product_structure_fk, pid.value as productID, 
      ei.value as ARPVend, ei2.value as whsecode 
     from epacube.PRODUCT_ASSOCIATION pa 
      inner join epacube.PRODUCT_IDENTIFICATION pid 
       on pa.PRODUCT_STRUCTURE_FK = pid.PRODUCT_STRUCTURE_FK 
      inner join import.IMPORT_RECORD_DATA ird 
       on pid.VALUE = ird.DATA_POSITION20 and ird.JOB_FK = 1514 
      inner join epacube.ENTITY_IDENTIFICATION ei 
       on ei.ENTITY_STRUCTURE_FK = pa.ENTITY_STRUCTURE_FK 
      inner join epacube.ENTITY_IDENTIFICATION ei2 
       on pa.ORG_ENTITY_STRUCTURE_FK = ei2.ENTITY_STRUCTURE_FK 
     where pa.DATA_NAME_FK = 253501 

     UNION 

     SELECT distinct pid.Product_structure_fk, 
      data_position20, data_position3, 
      data_position78 
     from Import.IMPORT_RECORD_DATA ird 
      inner join epacube.product_identification pid 
       on ird.DATA_POSITION20 = pid.VALUE where ird.JOB_FK = 1514 
     )a 
     group by ProductID, ARPVend 

返回這個結果集（3392條記錄）

ProdID  ARPVend RN 
026819143 26815 1 
026900102 65187 1 
026900102 83551 2 
061812104 80705 1 
061820327 80705 1 
061820327 100538 2 
061820578 74868 1 
061820578 69124 2 
061824934 93617 1 
061825815 30392 1 

從這個結果集，我想回到最常用的供應商爲產品

ProdID  AROVend RN 
026819143 26815 1 
026900102 83551 2 
061812104 80705 1 
061820327 100538 2 
061820578 69124 2 
061824934 93617 1 
061825815 30392 1 

我試圖在另一個查詢中包裝上述查詢使用Row_Number排名我的每個供應商的產品：

Select ProductID, ARPVend, 
Row_Number() over(partition by ProductID Order by rn desc) 
from (query above)a 

此查詢還返回3392條記錄，當我期望有更少的記錄時。 關於我在做什麼不正確的任何建議？

感謝您的任何幫助。

張國榮

Answer 1

這個問題不清楚，但如果你想獲得的第二組從第一次你在文件檔案化管理後，使用此：

SELECT ProductID, ARPVend, RN 
FROM 
(
    SELECT ProductID, ARPVend, RN, 
      Row_Number() OVER(PARTITION BY ProductID ORDER BY RN DESC) ROWNUM 
    FROM firstresultset 
) A 
WHERE ROWNUM = 1