小编fro*_*tin的帖子

嗨,我有一个小命令来批量复制文件,这将有所帮助,因为我每天多次执行此特定副本.使用xcopy命令时会发生此问题.一切都井然有序,但我收到此错误:"复制的路径0文件无效".这是代码:

C:\Windows\System32\xcopy  /Y "C:\Users\Ryan\Desktop\mmars_pub\" "C:\Users\Ryan\Desktop\Dropbox\MMARS\mmars_pub\"

我正在使用xcopy可执行文件的完整路径,因为我无法正确配置路径环境变量.我想它不应该影响结果.我在某处读到了"防止基于MS-DOS的程序检测Windows"复选框,应该解决这个问题,但我似乎无法找到它.任何帮助赞赏.

嗨,我在尝试执行下面的查询时收到此错误.任何想法或建议？

错误:"在包含外部引用的聚合表达式中指定了多个列.如果正在聚合的表达式包含外部引用,则该外部引用必须是表达式中引用的唯一列."

SELECT TestInstances.pkTestInstanceID AS 'pkTestInstanceID',
               bands.pkPerformanceLevelReportBandID AS 'BandID',
               bands.StackPosition AS 'StackPosition',
               (SELECT TOP 100 PERCENT SUM(CASE WHEN bands.StackPosition = b.StackPosition THEN 1 ELSE 0 END) * 100/ CASE WHEN COUNT(StudentScores_Subject.pkStudentScoreID) = 0 THEN 1 ELSE COUNT(StudentScores_Subject.pkStudentScoreID) END
                FROM PerformanceLevelReportBands b 
                WHERE b.fkPerformanceLevelReportID = @intPerfLevelReportId
                ORDER BY SUM(CASE WHEN bands.StackPosition = b.StackPosition THEN 1 ELSE 0 END) * 100/ CASE WHEN COUNT(StudentScores_Subject.pkStudentScoreID) = 0 THEN 1 ELSE COUNT(StudentScores_Subject.pkStudentScoreID) END) AS 'Percent',
         COUNT(StudentScores_Subject.pkStudentScoreID) AS 'Count'
         FROM StudentScores_Subject
                INNER JOIN StudentTests ON …

我有一串看起来像这样的值:

strSubjectIDs = "20,19,18,17,16,15";

无论如何反转字符串的顺序,strSubjectIDs以便ID看起来像这样:

"15,16,17,18,19,20"