基于MAX（）筛选列结果

我有两个查询，它们的结果集合在一起使用UNION。基于MAX（）筛选列结果

我想根据FilterColumn的MAX()过滤出行，但我无法弄清楚如何做到这一点。

+-----------------+----------+--------------+ 
| PropDescription | PropCode | FilterColumn | 
+-----------------+----------+--------------+ 
| 476SADDR1  | Finland |   2 | 
| 477SADDR1  | Sweden |   2 | 
| 1SADDR1   | 2038  |   1 | 
| 2SADDR1   | 2030  |   1 | 
| 3SADDR1   | 15  |   1 | 
| 4SADDR1   | 00000002 |   1 | 
| 6SADDR1   | 500  |   1 | 
| 8SADDR1   | 556  |   1 | 
| 9SADDR1   | 821  |   1 | 
+-----------------+----------+--------------+ 

SELECT 
    PropDescription 
    , PropCode 
    , FilterColumn 
FROM 
    (SELECT DISTINCT 
     CASE 
      WHEN PL.Type = 11 
       THEN PL.ADDR 
      ELSE P.ADDR 
      END AS N'PropDescription' 
     ,CASE 
      WHEN PL.TYPE = 3 
       THEN P.CODE 
      ELSE LPA.Value 
      END AS N'PropCode' 
     , 2 AS FilterColumn 
    FROM PROPERTY PL 
    INNER JOIN PROPLIST LP2 ON PL.ID = LP2.PropList 
    INNER JOIN PROPERTY P ON LP2.Property = P.ID 
    INNER JOIN PropAttribute LPA ON LPA.PropList = PL.ID 
    WHERE 1 = 1 
     AND PL.ID IN (SELECT Property from PROPLIST where PropList IN (47,46)) 
     AND P.TYPE = 3 

    UNION ALL 

    SELECT DISTINCT 
     CASE 
      WHEN PL.Type = 11 
       THEN PL.ADDR 
      ELSE P.ADDR 
      END AS N'PropDescription' 
     ,CASE 
      WHEN PL.TYPE = 3 
       THEN P.CODE 
      ELSE LPA.Value 
      END AS N'PropCode' 
     , 1 AS FilterColumn 
    FROM PROPERTY PL 
    INNER JOIN PROPLIST LP2 ON PL.ID = LP2.PropList 
    INNER JOIN PROPERTY P ON LP2.Property = P.ID 
    LEFT JOIN PropAttribute LPA ON LPA.PropList = PL.ID 
    WHERE 1 = 1 
    AND PL.ID IN (SELECT Property from PROPLIST where PropList IN (1,2,3,4)) 
    AND PL.TYPE = 3 
    ) AS ResultSet

我知道这很简单，但我现在不能弄明白。

预期成果是：

+-----------------+----------+--------------+ 
| PropDescription | PropCode | FilterColumn | 
+-----------------+----------+--------------+ 
| 476SADDR1  | Finland |   2 | 
| 477SADDR1  | Sweden |   2 | 
+-----------------+----------+--------------+

来源

2014-07-11 Radu Gheorghiu

所以将你的预期产出的样子，根据样本数据您提供什么？ –

嗯，从我读我很想念你怎么想的过滤器对FilterColumn工作附加条件....直到现在我明白这选择 PropDescription ，PropCode ，FilterColumn FROM （YourSubQuery） GROUP通过PropDescription，PropCode HAVING FilterColumn = MAX（FilterColumn） –

@ shree.pat18更新我的问题与预期的输出。 –

试试这个：

;with cte as 
(--Your union), 

filtered as 
(*, rank() over (order by filtercolumn desc) rank from cte) 

select * from filtered 
where rank = 1

来源

2014-07-11 07:33:20

是的，排名..就是这样！我知道我之前使用过一些东西，但不记得是什么。 –

@RaduGheorghiu不用担心，我们都会被这些事情困扰！ –

基于MAX（）筛选列结果

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