Sql server 按月排序，然后按年排序，当MonthYear是字符串SQL时

因为

MonthYear

是活动月和活动年的串联字符串-从行到列。我想按月份订购，但现在是字符串，按字符串值而不是int值订购。我怎样才能按子字符串（MonthYear，1，2），子字符串（MonthYear，2，4）将其分解为

顺序

但我得到了一个错误：

味精207，16级，状态1，第23行

列名“MonthYear”无效

味精207，16级，状态1，第23行

列名“MonthYear”无效

Msg 145，第15级，状态1，第12行

如果指定了select DISTINCT，则ORDER BY项目必须出现在选择列表中

尝试用以下内容替换@cols声明：

declare @ActivityYearStart int = 2014
declare @ActivityYear2 int = (@ActivityYearStart + 2)
declare @ActivityYearEnd int = 2015
declare @ActivityYearM1 int = (@ActivityYearEnd - 1)
declare @ActivityMonth int = 1
declare @ActivityMonth1 int = 3

DECLARE @cols AS NVARCHAR(MAX),
    @query  AS NVARCHAR(MAX)  


select @cols = STUFF((SELECT distinct ',' + QUOTENAME((CONVERT(varchar(5), ActivityMonth) + '-' 
                + CONVERT(varchar(5), ActivityYear))) As MonthYear
            FROM Forecast
            WHERE((ActivityYear = @ActivityYearStart)
              AND (ActivityMonth between  @ActivityMonth and 12))
              OR ((ActivityYear between @ActivityYear2 and @ActivityYearM1)
              AND (ActivityMonth between 1 and 12))
              OR ((ActivityYear = @ActivityYearEnd) 
              AND (ActivityMonth between 1 and @ActivityMonth1))
                     AND Category = 'Forecast'
           Group By Category, ID, ActivityMonth, ActivityYear
           Order By SUBSTRING(MonthYear, 1, 2), SUBSTRING(MonthYear, 2, 4)
        FOR XML PATH(''), TYPE
            ).value('.', 'NVARCHAR(MAX)') 
        ,1,1,'')


set @query = '  
    SELECT Category, ID, ' + @cols + ' FROM
             (
                SELECT Category, ID, (CONVERT(varchar(5), ActivityMonth) + ''-'' 
                + CONVERT(varchar(5), ActivityYear)) As MonthYear, HoursCharged
                FROM Forecast    
            ) x
            PIVOT 
            (
                Sum(HoursCharged)
                for MonthYear in (' + @cols + ')
            ) p '

execute(@query)

你能去掉“独特的”吗？您不应该需要它，因为您将ActivityMonth和ActivityYear包含在GROUP BY中。如果我去掉distinct，则order BY子句也会出现相同的错误。如果我删除order by语句，没有distinct，我会得到错误：Msg 1056，级别15，状态1，第2行。select列表中的元素数超过了允许的最大4096个元素数。消息102，级别15，状态1，第8行“x”附近的语法不正确。好的，为什么要按类别和ID分组？选择列表中没有这两个选项。
select @cols = STUFF((SELECT ',' + QUOTENAME((CONVERT(varchar(5), ActivityMonth) + '-' 
                + CONVERT(varchar(5), ActivityYear))) As MonthYear
            FROM Forecast
            WHERE((ActivityYear = @ActivityYearStart)
              AND (ActivityMonth between  @ActivityMonth and 12))
              OR ((ActivityYear between @ActivityYear2 and @ActivityYearM1)
              AND (ActivityMonth between 1 and 12))
              OR ((ActivityYear = @ActivityYearEnd) 
              AND (ActivityMonth between 1 and @ActivityMonth1))
                     AND Category = 'Forecast'
           Group By ActivityMonth, ActivityYear
           Order By ActivityYear, ActivityMonth
        FOR XML PATH(''), TYPE
            ).value('.', 'NVARCHAR(MAX)') 
        ,1,1,'')