Question

我在ms sql server 2005中编写了一个查询，并且在运行时遇到了一些麻烦。我需要我的查询包括：

包括日期范围2009-07-20至2009-08-04的所有文档
使用“尺寸”字段
包含记录计数列
按名称分组

select Name, count(*) AS FileCount, SUM(Size)  
From alldocs 
Group by DirName 
HAVING TimeCreated >= '2009-07-20' AND 
TimeCreated <= '2009-08-04'

Answer 1

由于您正在查询非聚合的字段（SUM，COUNT，AVG），因此您可以使用正常的WHERE：

SELECT
  DirName, count(*) AS FileCount, SUM(Size)
FROM
  alldocs 
WHERE
  TimeCreated >= '2009-07-20' 
  AND TimeCreated <= '2009-08-04'
GROUP BY
  DirName

如果你想根据一个聚合物来限制某些东西，你只需要HAVING，例如

HAVING Count(*) > 5

马克

PS：如果要显示MB而不是字节，请使用以下查询：

SELECT
  DirName, count(*) AS FileCount, SUM(Size) / (1024*1024) as 'Size MB'
FROM
  alldocs 
WHERE
  TimeCreated >= '2009-07-20' AND TimeCreated <= '2009-08-04'
GROUP BY
  DirName

Answer 2

为什么不

select Name, count(*) AS FileCount, SUM(Size)
From alldocs
WHERE TimeCreated between '2009-07-20' AND '2009-08-04'
Group by DirName

Answer 3

您应该将名称列添加到分组依据列表中。

SELECT Name, count(*) AS FileCount, SUM(Size)
FROM alldocs
WHERE TimeCreated between '2009-07-20' AND '2009-08-04'
GROUP BY Name

SQL查询帮助，ms sql server 2005（分组依旧）

3 个答案: