計算日期時間每個月內的行數，按年份月份分組

Question

我很難得到一個存儲程序來給我這種類型的輸出：

+-----------+------------------+
|   Month   | NoOfModifcations |
+-----------+------------------+
| Jan  2008 |                5 |
| Nov  2008 |                6 |
| Feb  2010 |               20 |
| Jul  2013 |                7 |
+-----------+------------------+

到目前為止，我設法使輸出看起來像這樣，但是我還沒有設法使輸出按年然后按月排序-這是按字母順序進行的。 這是我到目前為止的內容：

SELECT convert(varchar(4), YEAR(LastModifedDate)) + ' ' + convert(varchar(3),datename(month, LastModifedDate)) as Dates,
    count(*) as Number

FROM aims.Modification

WHERE CompanyID = @companyID 
    AND LastModifedDate >= DATEADD(month, @numberOfMonths * -1, GETDATE())

GROUP BY convert(varchar(4), YEAR(LastModifedDate)) + ' ' + convert(varchar(3),datename(month, LastModifedDate))

我確實在datetime字段上嘗試了ORDER BY，但得到了：

Column "aims.Modification.LastModifedDate" is invalid in the ORDER BY clause because it is not contained in either an aggregate function or the GROUP BY clause.

在日期時間上轉換/選擇/分組依據也很麻煩。 那里的任何建議也將非常有幫助！

提前致謝！

Answer 1

應該這樣做：

SELECT  CONVERT(VARCHAR(4),YEAR(LastModifedDate)) + ' ' + 
        CONVERT(VARCHAR(3),DATENAME(MONTH,LastModifedDate)) AS Dates,
        COUNT(*) as Number
FROM aims.Modification
WHERE CompanyID = @companyID 
    AND LastModifedDate >= DATEADD(MONTH,@numberOfMonths * -1,GETDATE())
GROUP BY CONVERT(VARCHAR(4),YEAR(LastModifedDate)) + ' ' + 
         CONVERT(VARCHAR(3),DATENAME(MONTH,LastModifedDate)),
         CONVERT(VARCHAR(6),LastModifedDate,112)
ORDER BY CONVERT(VARCHAR(6),LastModifedDate,112)

Answer 2

SELECT YEAR(LastModifedDate), MONTH(month) as Dates, count(*) as Number
FROM aims.Modification
WHERE CompanyID = @companyID 
    AND LastModifedDate >= DATEADD(month, @numberOfMonths * -1, GETDATE())
GROUP BY YEAR(LastModifedDate), MONTH(LastModifiedDate)
ORDER BY YEAR(LastModifedDate), MONTH(LastModifiedDate)

保持簡單，並在您的C＃代碼或報告中進行串聯...

Answer 3

使用此將您的varchar轉換為datetime

 SELECT CONVERT(Datetime,'Jan  2008 ')  

然后根據datetime desc對列進行排序。 對不起，我們還沒有完成一個簡短的答案，希望對您有所幫助。