SQL 合并两个表 - Order BY

Question

我有一个数据table如下。

Select * from TBL_01

Week     Group
Overall  Nicol  
Overall  Julie
Overall  Kelly

Select * from TBL_02

Week     Group
Week1    Nicol
Week1    Julie
Week1    Kelly
Week2    Nicol
Week2    Julie
Week2    Kelly
Week3    Nicol
Week3    Julie
Week3    Kelly

我需要得到如下结果table

Week     Group
Overall  Nicol  
Overall  Julie
Overall  Kelly
Week3    Nicol
Week3    Julie
Week3    Kelly
Week2    Nicol
Week2    Julie
Week2    Kelly
Week1    Nicol
Week1    Julie
Week1    Kelly

我需要 每周 完成这里的 trickey park ，如果我合并所有这些 table 并执行 order通过 desc 得到结果 table。它将按 整体、第 1 周、第 2 周和第 3 周 排序。

但我需要按整体、第 3 周、第 2 周和第 1 周
订购
感谢您的回复。

谢谢

Answer 1

这里是使用 case 表达式来控制排序的选项。

order by case [Week] 
    when 'Overall' then 1
    when 'Week3' then 2
    when 'Week2' then 3
    when 'Week1' then 4
end

Answer 2

您可以使用 union all 然后 order by:

select week, grp
from ((select week, grp from tbl_01) union all
      (select week, grp from tbl_02)
     ) t
order by charindex(week, 'Overall,Week3,Week2,Week1')

我发现 charindex() 为此目的比大量 case 声明更简单。

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