需要幫助撰寫查詢。

Question

編輯：下面是我正在使用的數據。我寫的查詢給出了基於OCCPSTAT字段的重複數據（最右邊的數據列，C或N）。

我需要一個查詢來拉出最接近我定義日期的記錄（代碼是這樣），但是，如果有記錄的C和N副本，我只需要N記錄。

5000 1000 D001 RNT 100 11/1/2014 0:00 C 
5000 1000 D001 GAS 200 11/1/2014 0:00 C 
5000 1000 D001 ELC 300 11/1/2014 0:00 C 
5000 1000 D001 WAT 400 11/1/2014 0:00 C 
5000 1000 D001 TAX 500 11/1/2014 0:00 C 
5000 1000 D001 INS 600 11/1/2014 0:00 C 
5000 1000 D001 RNT 200 11/1/2015 0:00 C 
5000 1000 D001 GAS 300 11/1/2015 0:00 C 
5000 1000 D001 ELC 400 11/1/2015 0:00 C 
5000 1000 D001 WAT 500 11/1/2015 0:00 C 
5000 1000 D001 TAX 600 11/1/2015 0:00 C 
5000 1000 D001 INS 700 11/1/2015 0:00 C 
5000 1000 D001 RNT 300 11/1/2016 0:00 C 
5000 1000 D001 GAS 400 11/1/2016 0:00 C 
5000 1000 D001 ELC 500 11/1/2016 0:00 C 
5000 1000 D001 WAT 600 11/1/2016 0:00 C 
5000 1000 D001 TAX 700 11/1/2016 0:00 C 
5000 1000 D001 INS 800 11/1/2016 0:00 C 
5000 1000 D001 RNT 500 11/1/2017 0:00 C 
5000 1000 D001 GAS 600 11/1/2017 0:00 C 
5000 1000 D001 ELC 700 11/1/2017 0:00 C 
5000 1000 D001 WAT 800 11/1/2017 0:00 C 
5000 1000 D001 TAX 900 11/1/2017 0:00 C 
5000 1000 D001 INS 100011/1/2017 0:00 C 
5000 1000 D001 RNT 100 11/1/2014 0:00 N 
5000 1000 D001 GAS 200 11/1/2014 0:00 N 
5000 1000 D001 ELC 300 11/1/2014 0:00 N 
5000 1000 D001 WAT 400 11/1/2014 0:00 N 
5000 1000 D001 TAX 500 11/1/2014 0:00 N 
5000 1000 D001 INS 600 11/1/2014 0:00 N 
5000 1000 D001 RNT 200 11/1/2015 0:00 N 
5000 1000 D001 GAS 300 11/1/2015 0:00 N 
5000 1000 D001 ELC 400 11/1/2015 0:00 N 
5000 1000 D001 WAT 500 11/1/2015 0:00 N 
5000 1000 D001 TAX 600 11/1/2015 0:00 N 
5000 1000 D001 INS 700 11/1/2015 0:00 N 
5000 1000 D001 RNT 300 11/1/2016 0:00 N 
5000 1000 D001 GAS 400 11/1/2016 0:00 N 
5000 1000 D001 ELC 500 11/1/2016 0:00 N 
5000 1000 D001 WAT 600 11/1/2016 0:00 N 
5000 1000 D001 TAX 700 11/1/2016 0:00 N 
5000 1000 D001 INS 800 11/1/2016 0:00 N 
5000 1000 D001 RNT 500 11/1/2017 0:00 N 
5000 1000 D001 GAS 600 11/1/2017 0:00 N 
5000 1000 D001 ELC 700 11/1/2017 0:00 N 
5000 1000 D001 WAT 800 11/1/2017 0:00 N 
5000 1000 D001 TAX 900 11/1/2017 0:00 N 
5000 1000 D001 INS 1000 11/1/2017 0:00 N 

查詢是：

SELECT 
    BLDGID, 
    LEASID, 
    SUITID, 
    INCCAT, 
    AMOUNT, 
    EFFDATE, 
    OCCPSTAT 

FROM( 
    SELECT 
    CM.BLDGID, 
    CM.LEASID, 
    LS.SUITID, 
    CM.INCCAT, 
    CM.AMOUNT, 
    CM.EFFDATE, 
    LS.OCCPSTAT, 
ROW_NUMBER() OVER(PARTITION BY CM.BLDGID, CM.LEASID, LS.SUITID, CM.INCCAT, LS.OCCPSTAT 
ORDER BY CM.EFFDATE DESC) AS rowno 

FROM SQLDATA.DBO.CMRECC CM INNER JOIN SQLDATA.DBO.LEAS LS ON CM.LEASID = LS.LEASID 
WHERE (CM.EFFDATE < '20170601') AND (CM.BLDGID = '85000') AND (LS.OCCPSTAT = 'C' OR LS.OCCPSTAT = 'N') 


) AS d 
WHERE rowno = 1 

Answer 1

你不需要爲這個case。一種方法是跟蹤每個組的occpstat列，然後應用where中的邏輯。

但是，我認爲有一個更簡單的解決方案。從partition by移動occpstat到order by和第一選擇「N」值：

SELECT BLDGID, LEASID, SUITID, INCCAT, AMOUNT, EFFDATE, OCCPSTAT 
FROM (SELECT CM.BLDGID, CM.LEASID, LS.SUITID, CM.INCCAT 
      CM.AMOUNT, CM.EFFDATE, LS.OCCPSTAT, 
      ROW_NUMBER() OVER (PARTITION BY CM.BLDGID, CM.LEASID, LS.SUITID, CM.INCCAT 
           ORDER BY LS.OCCPSTAT DESC, CM.EFFDATE DESC) AS rownum 
    FROM SQLDATA.DBO.CMRECC CM INNER JOIN 
      SQLDATA.DBO.LEAS LS 
      ON CM.LEASID = LS.LEASID 
    WHERE CM.EFFDATE < '20170601' AND CM.BLDGID = '85000' AND 
      LS.OCCPSTAT IN ('C', 'N') 
    ) d 
WHERE rownum = 1