Sql 需要在不添加结果的情况下将两个日期部分合并到新的日期字段中

我试图得到两个日期部分，日和年，在不添加结果的情况下合并成一个新的数据字段。我不知道我做错了什么，任何帮助都将不胜感激

sELECT   Convert(varchar,dbo.tblRpt291_AgingSnapshot.ReportDate)as DATEINT, Datepart(DAY,dbo.tblRpt291_AgingSnapshot.ReportDate)+ ''+''+DATEPART(YEAR,dbo.tblRpt291_AgingSnapshot.ReportDate) as Date, dbo.tblRpt291_AgingSnapshot.ReportDate, First.Age AS AvgAge, First.CountOfCalls AS Inventory
FROM         dbo.tblRpt291_AgingSnapshot LEFT OUTER JOIN
                          (SELECT     ReportDate, AVG(CAST(Age AS Numeric)) AS Age, SUM(CAST(CountOfCalls AS Numeric)) AS CountOfCalls
FROM         dbo.tblRpt291_AgingSnapshot AS tblRpt291_AgingSnapshot_1
WHERE     (Client = 'PEMS') AND (WorkableStatus = 'Workable') AND (Worktype IN ('Individual PCP', 'Group PCP'))
GROUP BY ReportDate) AS First ON dbo.tblRpt291_AgingSnapshot.ReportDate = First.ReportDate
WHERE     (MONTH(dbo.tblRpt291_AgingSnapshot.ReportDate) = 12) AND (YEAR(dbo.tblRpt291_AgingSnapshot.ReportDate) in (2013,2014))
GROUP BY dbo.tblRpt291_AgingSnapshot.ReportDate, First.Age, First.CountOfCalls
order by dbo.tblRpt291_AgingSnapshot.ReportDate ​

在连接之前，您需要将这两个部分转换为字符串，这样它们就不会相加，因为

DATEPART（）

返回的是一个整数：

, CAST(Datepart(DAY,dbo.tblRpt291_AgingSnapshot.ReportDate) AS VARCHAR(5))+CAST(DATEPART(YEAR,dbo.tblRpt291_AgingSnapshot.ReportDate) AS VARCHAR(5)) as Date

此外，表别名将有助于提高可读性，我建议避免使用关键字作为别名：

SELECT   Convert(varchar,a.ReportDate)as DATEINT
       , CAST(Datepart(DAY,a.ReportDate) AS VARCHAR(5))+CAST(DATEPART(YEAR,a.ReportDate) AS VARCHAR(5)) as Dt
       , a.ReportDate
       , b.Age AS AvgAge
       , b.CountOfCalls AS Inventory
FROM         dbo.tblRpt291_AgingSnapshot a 
LEFT OUTER JOIN     (SELECT     ReportDate, AVG(CAST(Age AS Numeric)) AS Age, SUM(CAST(CountOfCalls AS Numeric)) AS CountOfCalls
                     FROM         dbo.tblRpt291_AgingSnapshot AS tblRpt291_AgingSnapshot_1
                     WHERE     (Client = 'PEMS') AND (WorkableStatus = 'Workable') AND (Worktype IN ('Individual PCP', 'Group PCP'))
                     GROUP BY ReportDate) AS b
    ON a.ReportDate = b.ReportDate
WHERE     (MONTH(a.ReportDate) = 12) AND (YEAR(a.ReportDate) in (2013,2014))
GROUP BY a.ReportDate, b.Age, b.CountOfCalls
order by a.ReportDate ​

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您需要转换datepart的-SQL将它们视为整数，您希望它们的行为类似于文本

例如：

select cast(Datepart(DAY,getdate()) AS varchar(2)) + 

cast(DATEPART(YEAR,getdate()) AS varchar(4)) as Date

---

将getdate（）替换为您的列名。

是否有错误？结果不正确？此外，如果使用表别名，您的查询将更容易阅读。是的，当我将其合并时，它看起来好像年份已结束，例如报告日期年份为2013合并后的年份显示为2014