行列轉換後再加一個總分列,名次列
select st.StuNo, name as 姓名 ,
max(case course when '語文' then score else 0 end) 語文,
max(case course when '數學' then score else 0 end) 數學,
max(case course when '物理' then score else 0 end) 物理,
sum(score) as 總分,
RANK() OVER(ORDER BY sum(score)desc) as 名次
from Student as st,Score as sc
where st.StuName=sc.name
group by name,st.StuNo
order by 總分 desc
用RANK() 會出現相同名次的情況
如：
| 成績 | 名次 |
| 92 | 1 |
| 92 | 1 |
| 90 | 3 |
而使用ROW_NUMBER() 則不會出現這種情況
代碼如下：
select st.StuNo, name as 姓名 ,
max(case course when '語文' then score else 0 end) 語文,
max(case course when '數學' then score else 0 end) 數學,
max(case course when '物理' then score else 0 end) 物理,
sum(score) as 總分,
ROW_NUMBER() OVER(ORDER BY sum(score)desc) as 名次
from Student as st,Score as sc
where st.StuName=sc.name
group by name,st.StuNo
order by 總分 desc
如：
| 成績 | 名次 |
| 92 | 1 |
| 92 | 2 |
| 90 | 3 |