MSSQL 使用 sum 函数对结果进行分页答案

【问题标题】：MSSQL Paginate results with a sum functionMSSQL 使用 sum 函数对结果进行分页
【发布时间】：2012-04-17 11:39:54
【问题描述】：

我有一个表格，其中包含特定日期的某个类别的点击次数。像这样：

ID  CatID   Date                 Count
1   DADB    2011-11-04 00:00:00      3
2   DCBC    2011-11-04 00:00:00      9
3   DADH    2011-11-04 00:00:00      9

所以要显示两个日期之间每个类别的总数，我会这样做：

SELECT WebClicksCategory.CatID, sum(WebClicksCategory.Count) as Count
FROM [Web].[dbo].[WebClicksCategory]
WHERE Date >= '2011-04-17 00:00:00.000'
AND Date <= '2012-04-17 00:00:00.000'
GROUP BY WebClicksCategory.CatID
ORDER BY Count desc

但是，如果我想对这些结果进行分页并执行以下操作：

SELECT * FROM 
( SELECT  row_number() OVER (order by Count) AS rownum, 
WebClicksCategory.CatID, sum(WebClicksCategory.Count) as Count 
FROM [Web].[dbo].[WebClicksCategory]
WHERE Date >= '2011-04-17 00:00:00.000'
AND Date <= '2012-04-17 00:00:00.000'
GROUP BY WebClicksCategory.CatID
) AS A
WHERE A.rownum BETWEEN (50) AND (200)

但我得到一个“列 WebClicksCategory.Count 在选择列表中无效，因为它既不包含在聚合函数也不包含在 GROUP BY 子句中”错误。还有其他方法可以对结果进行分页吗？

【问题讨论】：

标签： sql sql-server pagination

【解决方案1】：

问题不在于在中包含聚合，而实际上是在 OVER 子句中包含它：

( SELECT  row_number() OVER (order by Count) AS rownum,

所以我的建议是：

SELECT rownum, CatID, Count FROM 
( SELECT  row_number() OVER (order by Count) AS rownum, CatID, Count
FROM 
  ( SELECT WebClicksCategory.CatID, sum(WebClicksCategory.Count) as Count 
    FROM [Web].[dbo].[WebClicksCategory]
    WHERE Date >= '2011-04-17 00:00:00.000'
    AND Date <= '2012-04-17 00:00:00.000'
    GROUP BY WebClicksCategory.CatID
  ) AS B
) AS A
WHERE A.rownum BETWEEN (50) AND (200)

【讨论】：