ROW_NUMBER（）SUB QUERY ISSUE

Question

我正在尝试在特定时间段内找到活动。

可以并且将会有一个'fileno'的多条记录我想将其限制为一条记录。

SELECT   MASTER.FILENO, MASFORW.FORW_NO, MASTER.FORW_FILENO, 
         MASTER.COCO_FILENO, MASFORW.SORT_FIELD, TRACKUSR.trck_date, 
         TRACKUSR.whoami, TRACKUSR.track, TRACKUSR.rerite, 
         ROW_NUMBER() OVER (PARTITION BY  MASTER.FILENO  
                            ORDER BY TRACKUSR.TRCK_DATE DESC) AS rownum
FROM    MASFORW 
INNER JOIN  MASTER 
        ON MASFORW.FORW_NO = MASTER.FORW_NO 
FULL OUTER JOIN TRACKUSR 
        ON MASTER.FILENO = TRACKUSR.fileno
WHERE (TRACKUSR.TRCK_DATE >= DATEADD(day, 0, GETDATE())) 
  AND (TRACKUSR.TRCK_DATE < DATEADD(day, 90, GETDATE())) 
  AND (MASFORW.SORT_FIELD = N'CR' OR
                         MASFORW.SORT_FIELD = N'CJ') 
  and (rownum = 1)  

Answer 1

创建一个子查询，然后在外面过滤rownum。

您无法在同一查询中使用别名，因为此时您会检查别名的创建位置

SELECT *
FROM (
      SELECT ROW_NUMBER() OVER (PARTITION BY  MASTER.FILENO  
                                ORDER BY TRACKUSR.TRCK_DATE DESC) AS rownum
      FROM ...
     ) as subquery
WHERE rownum = 1

Answer 2

你不能在where子句中使用别名......

有一个sql语句层次结构..

1. from table
2. where clause
3. group by
4. 有
5. 选择
6. 通过
订购

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Answer 3

假设查询的其余部分没问题，您可以通过替换

来清除错误

and (rownum = 1)      

与

having ROW_NUMBER() OVER (PARTITION BY  MASTER.FILENO  
       ORDER BY TRACKUSR.TRCK_DATE DESC) = 1