Question

我的成绩数据库有时会每天刷新几次，如果没有输入新成绩，则每次都可能是相同的成绩。查询我找到了每个课程编号的每日最高分数，所以现在我只想在它发生变化时找到并显示成绩，表明已经输入了新的成绩。如果有人能指出我正确的方向。谢谢！

select distinct convert(date,GradeDate)'Grade Date', 
max(gradescore) 'Grade Score', coursenbr
from resultstbl 
group by Gradedate, coursenbr
order by coursenbr

以下是我的结果：

File Date   Current Score   coursenbr
2014-05-11  92.5            111
2014-05-22  92.5            111
2014-05-24  92.5            111
2014-05-12  NULL            222
2014-05-21  75              444
2014-05-23  75              444
2014-05-26  75              444
2014-05-12  50              333
2014-05-21  80.2            777
2014-05-23  80              888
2014-05-26  80              888
2014-05-27  80              888

Answer 1

尝试在桌面上使用更新触发器

Answer 2

查询基于您的resultstbl。输出有CurrentScore，LastScore和一个位标志，表示自上次记录以来分数是否变化。

尝试

SELECT *
    , CASE
        WHEN (sub.[Current Score] <> sub.[Last Score])
        THEN CAST(1 as bit)
            ELSE CAST(0 as bit)
        END
    AS [Score Changed]
FROM
(
    SELECT [File Date]
        , [Current Score]
        , (
            SELECT TOP 1 b.[Current Score]
             FROM resultstbl b
              WHERE b.[File Date] < a.[File Date]
               AND b.coursenbr = a.coursenbr
            ORDER BY b.[File_Date] DESC
        )
        AS [Last Score]
        , [coursenbr]
    FROM resultstbl a
) sub

找到成绩变化的时间

2 个答案: