SQL order by concatenated Month and Year字符串

我有一个有趣的查询，其中包含错误的聚合命令，因为它以字母顺序排列日期，因为它们是字符串（VARCHARS）。它如下。SQL order by concatenated Month and Year字符串

DROP PROCEDURE dbo.DeploymentReport 
GO 

CREATE PROCEDURE dbo.DeploymentReport 
@Date DATE 
AS 
BEGIN 
SELECT TOP 6 DATENAME(MONTH,DeployDate) + ' - ' + DATENAME(YEAR,DeployDate) AS 'Month', 
     ISNULL(SUM(CASE WHEN OverallRiskRating = 3 THEN 1 END),0) AS 'High', 
     ISNULL(SUM(CASE WHEN OverallRiskRating = 2 THEN 1 END),0) AS 'Med', 
     ISNULL(SUM(CASE WHEN OverallRiskRating = 1 THEN 1 END),0) AS 'Low'  
FROM dbo.ChangeEvaluationForm cef 
INNER JOIN dbo.Package pac 
ON cef.ChangeId = pac.ChangeId 
INNER JOIN dbo.SDMTicket sdm 
ON pac.PackageId = sdm.PackageId 
WHERE DeployDate < @Date 
GROUP BY DATENAME(MONTH, DeployDate) + ' - ' + DATENAME(YEAR,DeployDate) 
ORDER BY DATENAME(MONTH, DeployDate) + ' - ' + DATENAME(YEAR,DeployDate) DESC 
END 
GO 

DECLARE @DateSelected DATETIME 
SET @DateSelected = CONVERT(DATE,'2017-12-30') 
EXECUTE dbo.DeploymentReport @Date = @DateSelected;

结果如下所示

正如你所看到的月份按日期排序的字母数字代替。

现在我对汇总查询是绝对残酷的，所以我的斗争是改变ORDER BY行，以便以某种方式解析“月”列中的年份和月份，以及年份和月份中的订单，而不更改数据返回的结构。

这是不是可能，或者是我认为不可能的方法或者错误的思维方式？

来源

2017-09-05 David

只是不按DATENAME命令。只需使用“ORDER BY DATEPART（mm，DeployDate）”等等 –

您可以通过条款，添加year(DeployDate)和month(DepolyDate)到组，因为你已经在使用组datename(year, DeployDate)和datename(month, DeployDate) by子句应该没有效果都没有，其他的则是，它可以让你使用他们的按条款排序：

CREATE PROCEDURE dbo.DeploymentReport 
@Date DATE 
AS 
BEGIN 
SELECT TOP 6 DATENAME(MONTH,DeployDate) + ' - ' + DATENAME(YEAR,DeployDate) AS 'Month', 
     ISNULL(SUM(CASE WHEN OverallRiskRating = 3 THEN 1 END),0) AS 'High', 
     ISNULL(SUM(CASE WHEN OverallRiskRating = 2 THEN 1 END),0) AS 'Med', 
     ISNULL(SUM(CASE WHEN OverallRiskRating = 1 THEN 1 END),0) AS 'Low'  
FROM dbo.ChangeEvaluationForm cef 
INNER JOIN dbo.Package pac 
ON cef.ChangeId = pac.ChangeId 
INNER JOIN dbo.SDMTicket sdm 
ON pac.PackageId = sdm.PackageId 
WHERE DeployDate < @Date 
GROUP BY DATENAME(MONTH, DeployDate) + ' - ' + DATENAME(YEAR,DeployDate), Year(DeployDate), Month(DeployDate) 
ORDER BY Year(DeployDate) DESC, Month(DeployDate) DESC 
END 
GO

来源

2017-09-05 14:52:01

这个工程也很棒，我实际上选择使用这个解决方案来代替可读性 – David

很高兴为您提供帮助： - ） –

移GROUP BY逻辑到使用更“日期样”分组列的子查询，然后应用TOP和ORDER BY在外部查询：

SELECT TOP 6 DATENAME(MONTH,DeployDate) + ' - ' + DATENAME(YEAR,DeployDate) AS 'Month', 
     High,Med,Low 
FROM (
     SELECT DATEADD(month,DATEDIFF(month,0,DeployDate),0) as DeployDate, 
     ISNULL(SUM(CASE WHEN OverallRiskRating = 3 THEN 1 END),0) AS 'High', 
     ISNULL(SUM(CASE WHEN OverallRiskRating = 2 THEN 1 END),0) AS 'Med', 
     ISNULL(SUM(CASE WHEN OverallRiskRating = 1 THEN 1 END),0) AS 'Low'  
FROM dbo.ChangeEvaluationForm cef 
INNER JOIN dbo.Package pac 
ON cef.ChangeId = pac.ChangeId 
INNER JOIN dbo.SDMTicket sdm 
ON pac.PackageId = sdm.PackageId 
WHERE DeployDate < @Date 
GROUP BY DATEADD(month,DATEDIFF(month,0,DeployDate),0) 
) t 
ORDER BY DeployDate DESC

这里，DATEADD(month,DATEDIFF(month,0,DeployDate),0)轮DeployDate柱向下在相关月份的第一天开始的午夜 - 因此同一月份内的所有DeployDate值都会生成相同的值。然后，在此列上分组就相当于对您的字符串进行分组，但它仍然是datetime，因此可以在外部ORDER BY中正确使用。（而且仍然可以使用外SELECT提取年份和月份组成部分）

来源

2017-09-05 14:48:27

这就像一个魅力。非常感谢你！ – David

你的时间跨度是有序的，所以我只选择在每一个任意值，并做到：

ORDER BY MIN(DeployDate) DESC

我应该注意到我更喜欢YYYY-MM格式;一个重要的原因是它可以正确地命令。

来源

2017-09-05 14:50:09

SQL order by concatenated Month and Year字符串

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