Sql server 按月份和年份分组以获得不同的月份和年份，然后合并为单个日期SQL

有没有更好的方法通过一个查询来实现这一点

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查询应返回表中唯一的月份和年份，但作为组合日期。

对于此类问题，示例数据确实是必要的，但此函数也可以为您提供帮助

SELECT CONVERT(DATE,CAST([Year] AS VARCHAR(4))+'-'+
                    CAST([Month] AS VARCHAR(2))+'-'+
                    CAST('1' AS VARCHAR(2))) Date 
FROM (SELECT YEAR(Date) as [Year], MONTH(Date) as [Month] FROM [dbo].[Data] 
GROUP BY YEAR(Date), MONTH(Date)) x
                    ORDER BY Date DESC

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对于这类问题，示例数据确实是必要的，但此函数也可以为您提供帮助

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此代码接受您输入的任何日期，并将其计算为当月的第一个日期。有效地只看月份和年份：

SELECT 
  DATEFROMPARTS([Year], [Month], 01)
FROM 
(
  SELECT 
    YEAR(Date) as [Year], 
    MONTH(Date) as [Month] 
  FROM [dbo].[Data] 
  GROUP BY YEAR(Date), MONTH(Date)
) x
ORDER BY Date DESC

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此代码接受您输入的任何日期，并将其计算为当月的第一个日期。有效地只看月份和年份：

SELECT 
  DATEFROMPARTS([Year], [Month], 01)
FROM 
(
  SELECT 
    YEAR(Date) as [Year], 
    MONTH(Date) as [Month] 
  FROM [dbo].[Data] 
  GROUP BY YEAR(Date), MONTH(Date)
) x
ORDER BY Date DESC

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您应该发布表的一些示例数据和所需的结果请标记您的sql server版本您应该发布表的一些示例数据和所需的结果请标记您的sql server版本

SELECT
    DATEADD(MM,DATEDIFF(MM,0, [Date] ),0) AS [YearMonth]
FROM [dbo].[Data]
ORDER BY
    DATEADD(MM,DATEDIFF(MM,0, [Date] ),0)
;