樞軸SQL以秩

Question

基本上我有以下查詢，我想從這個區別只有獨特的行列：

WITH numbered_rows 
    as (
    SELECT Claim, 
      reserve, 
      time, 
      RANK() OVER (PARTITION BY ClaimNumber ORDER BY time asc) as 'Rank' 
    FROM (   
    SELECT cc.Claim, 
      MAX(csd.time) as time, 
      csd.reserve 

    FROM ClaimData csd WITH (NOLOCK) 

     JOIN Core cc WITH (NOLOCK) 
      on cc.ClaimID = csd.ClaimID 

    GROUP BY cc.Claim, csd.Reserve 

     ) as t 
    ) 
    select * 
    from numbered_rows cur, numbered_rows prev 
    where cur.Claim= prev.Claim 
      and cur.Rank = prev.Rank -1 

結果集我得到的是以下幾點：

Claim reserve Time  Rank Claim reserve Time  Rank 
-------------------------------------------------------------------- 
11  0  12/10/2012 1  11  15000 5/30/2013 2 
34  2000  1/21/2013 1  34  750  1/31/2013 2 
34  750  1/31/2013 2  34  0  3/31/2013 3 
07  800000 5/9/2013 1  07  0  5/10/2013 2 

但我只想看到以下內容:(已刪除索賠34等級2，因爲它不是最高的）

Claim reserve Time  Rank Claim reserve Time  Rank 
-------------------------------------------------------------------- 
11  0  12/10/2012 1  11  15000 5/30/2013 2 
34  750  1/31/2013 2  34  0  3/31/2013 3 
07  800000 5/9/2013 1  07  0  5/10/2013 2 

Answer 1

I th墨水，你可以通過逆轉你的邏輯來完成這個操作，例如按時間順序排序，在最終選擇中切換曲線和預覽，並在最終選擇中將-1更改爲+1，然後將prev.rank限制爲1，從而確保您只包括每個索賠的最新2個結果：

WITH numbered_rows AS 
( SELECT Claim, 
      reserve, 
      time, 
      [Rank] = RANK() OVER (PARTITION BY ClaimNumber ORDER BY time DESC) 
    FROM ( SELECT cc.Claim, 
         [Time] = MAX(csd.time), 
         csd.reserve 
       FROM ClaimData AS csd WITH (NOLOCK) 
         INNER JOIN JOIN Core AS cc WITH (NOLOCK) 
          ON cc.ClaimID = csd.ClaimID 
       GROUP BY cc.Claim, csd.Reserve 
      ) t 
) 
SELECT * 
FROM numbered_rows AS prev 
     INNER JOIN numbered_rows AS cur 
      ON cur.Claim= prev.Claim 
      AND cur.Rank = prev.Rank + 1 
WHERE prev.Rank = 1;