从数位变量

Question

我有老师的表，9列

TeacherID, TeacherName, Reception, Year1, Year2, Year3, Year4, Year5, ALevel 

我需要连接的最小和最大位值（接待 - Year5）选择的最小值和最大值1，然后在选择显示它语句，所以它的输出为（在这种情况下，第1年，第2年和第3年被勾选）：Y1 - Y3。

SELECT 
    TeacherID, TeacherName, 
    Reception + Year1 + Year2 + Year3 + Year4 + Year5 + ALevel as 'KeyStage' 
FROM Teachers 

有关如何做到这一点的任何想法？

非常感谢，马特

Answer 1

SELECT 
    TeacherID, 
    TeacherName, 
    CASE 
     WHEN Reception > 0 THEN 'Re' 
     WHEN Year1 > 0 THEN 'Y1' 
     WHEN Year2 > 0 THEN 'Y2' 
     WHEN Year3 > 0 THEN 'Y3' 
     WHEN Year4 > 0 THEN 'Y4' 
     WHEN Year5 > 0 THEN 'Y5' 
     WHEN ALevel > 0 THEN 'AL' 
     ELSE '' END 
    + ' - ' + 
    CASE 
     WHEN ALevel > 0 THEN 'AL' 
     WHEN Year5 > 0 THEN 'Y5' 
     WHEN Year4 > 0 THEN 'Y4' 
     WHEN Year3 > 0 THEN 'Y3' 
     WHEN Year2 > 0 THEN 'Y2' 
     WHEN Year1 > 0 THEN 'Y1' 
     WHEN Reception > 0 THEN 'Re' 
     ELSE '' END AS Range 
FROM 
    Teachers 

Answer 2

试试这个; First Case从Reception起始MinYear和Second Case从ALevel起始MaxYear。另外补充else针对每一种情况下，以避免越来越空，如果他们都不是1

SELECT TeacherID, TeacherName, Reception, 
     Case when Reception = 1 then 'R' 
      when Year1 = 1 then 'Y1' 
      ... 
      when ALevel = 1 then 'AL' 
      else '' 
     End + ' - ' 
     Case when ALevel = 1 then 'AL' 
      when Year5 = 1 then 'Y5' 
      ... 
      when Reception= 1 then 'R' 
      else '' 
     End As KeyStage 
FROM Teachers 

Answer 3

我不会。在你的客户端代码中执行（php，c＃）。你的规范也不清楚，如果选择第1,3和5年，而第2和第4年则不是？

Answer 4

这应该适合你，我没有测试过它，你可能需要做一些改变。请注意，如果没有检查位，则会得到一个空值。我会使用空值，因为如果没有检查到任何东西，那么你就不会有这个奇怪的短划线，并且你可以使用isnull将值更改为你所希望的未选择年份。

SELECT TeacherID, 
    TeacherName, 
    case when Reception = 1 then 'R' 
     when Year1 = 1 then 'Y1' 
     when Year2 = 1 then 'Y2' 
     when Year3 = 1 then 'Y3' 
     when Year4 = 1 then 'Y4' 
     when Year5 = 1 then 'Y5' 
     when ALevel = 1 then 'AL' 
     else null end + ' - ' + 
    case when Reception = 1 then 'R' 
     when Year1 = 1 then 'Y1' 
     when Year2 = 1 then 'Y2' 
     when Year3 = 1 then 'Y3' 
     when Year4 = 1 then 'Y4' 
     when Year5 = 1 then 'Y5' 
     when ALevel = 1 then 'AL' 
     else null end as 'KeyStage' 
FROM Teachers