基于日期的 MM-YYYY 部分计数的 SQL 查询

Question

我需要根据工作申请日期显示过去 12 个月的工作申请数量，并且还需要根据工作申请日期对其进行分组

我尝试按照它生成错误，如下所示。

SELECT 
   COUNT(MONTH(ApplicationDate) AS VARCHAR(2)) + '-' + CAST(YEAR(ApplicationDate) AS VARCHAR(4)) AS Total, 
   ApplicationDate 
FROM 
   [Jobs] 
GROUP BY 
   ApplicationDate, ApplicationDate 
ORDER BY
   ApplicationDate 

但这导致了一个错误：

消息 195，第 15 级，状态 10，第 9 行
“COUNT”不是可识别的内置函数名称。

SQL Server 2008 需要它

最终工作解决方案

SELECT   
MONTH(ApplicationDate),   YEAR(ApplicationDate),   COUNT(*) AS Total, 
    (CAST(MONTH(ApplicationDate) AS VARCHAR(2)) + '-' + CAST(YEAR(ApplicationDate) AS VARCHAR(4)))  as ApplicationDate
    FROM    [Jobs] 
GROUP BY    YEAR(ApplicationDate),   MONTH(ApplicationDate)

ORDER BY
       YEAR(ApplicationDate),   MONTH(ApplicationDate)

Answer 1

您需要尝试这样的方法来获取每个月/年的一行，其中包含该月/年的应用程序计数：

SELECT
   MONTH(ApplicationDate),
   YEAR(ApplicationDate),
   COUNT(*)
FROM 
   dbo.[Jobs] 
GROUP BY 
   YEAR(ApplicationDate),
   MONTH(ApplicationDate)
ORDER BY
   YEAR(ApplicationDate),
   MONTH(ApplicationDate)

这也计算每月/每年的应用程序并按其分组。你应该得到这样的输出：

（这取自AdventureWorks示例数据库）

如果您执行GROUP BY ApplicationDate，那么您基本上是按实际日期本身（不是月/年部分）进行分组/计数

更新：如果您必须让 SQL Server 提供 MM-YYYY 格式的格式（确实应该在您的 Web 应用程序中完成，而不是由 SQL Server 完成），然后试试这个：

;WITH GroupedData AS
(
    SELECT
       DateMonth = MONTH(ApplicationDate),
       DateYear = YEAR(ApplicationDate),
       JobsCount = COUNT(*)
    FROM 
       dbo.[Jobs]
    GROUP BY 
       YEAR(ApplicationDate),
       MONTH(ApplicationDate)
)
SELECT
    RIGHT('00' + CAST(DateMonth AS VARCHAR(2)), 2) + '-' +
    CAST(DateYear AS VARCHAR(4)),
    JobsCount 
FROM 
    GroupedData
ORDER BY
    DateMonth, DateYear

Answer 2

这个怎么样？

 SELECT 
       COUNT(*) AS Total, 
       (CAST(MONTH(ApplicationDate) AS VARCHAR(2)) + '-' + CAST(YEAR(ApplicationDate) AS VARCHAR(4)))  as ApplicationDate 
    FROM 
       [Jobs]  
    GROUP BY 
       (CAST(MONTH(ApplicationDate) AS VARCHAR(2)) + '-' + CAST(YEAR(ApplicationDate) AS VARCHAR(4))) 
    ORDER BY
      ApplicationDate 

cast 函数缺少一个月。输出如下。

Total   ApplicationDate
22217   7-2012
17979   8-2012
30341   9-2012

为排序而编辑...

如果您不特别关注“MM-YYYY”格式。将月/年组合转换为数字并按此排序。试试这个。

 SELECT 
   COUNT(*) AS Total, 
   RIGHT(CONVERT(VARCHAR(10), ApplicationDate, 103), 7)  as ApplicationDate, 
   CAST(REPLACE(RIGHT(CONVERT(VARCHAR(10), ApplicationDate, 103), 7), '/', '') as int) as numdate
FROM 
   [Jobs] 
GROUP BY 
   RIGHT(CONVERT(VARCHAR(10), ApplicationDate, 103), 7)
ORDER BY
  numdate,ApplicationDate

Answer 3

试试这个……

SELECT  DATENAME(month,ApplicationDate) + ' ' + CAST(DATEPART(year,ApplicationDate) AS VARCHAR(4)),
        COUNT(1) TotalCnt
FROM    dbo.[Jobs] 
GROUP BY DATENAME(month,ApplicationDate) + ' ' + CAST(DATEPART(year,ApplicationDate) AS VARCHAR(4))