SQL服務器 - 通過價值觀集團從不同的列

Question

我有一組數據是這樣的：

ID Person1 Value1 Person2 Value2 Person3 Value3 Period 
    --------------------------------------------------------------------- 
    1  A  1   D  1       June 
    2  B  2            July 
    3  C  3            June 
    4  B  1   C  3   A  2  August 
    5  C  2   A  2       June 

列ID僅僅是一個行標識符，並沒有任何意義。我想按人物和時期將他們分組，然後是每個人的價值總和。預期結果如下所示：

Person Period Value 
----------------------- 
    A  June  3 
    A  August 2 
    B  July  2 
    B  August 1 
    C  June  5 
    C  August 3 
    D  June  1 

可行嗎？任何幫助，將不勝感激！

Answer 1

基於問題編輯和評論：

SELECT Person, Period, SUM(Val) as total 
FROM (
    SELECT Person1 as Person, Period, Value1 as Val 
    FROM tablename 
    UNION ALL 
    SELECT Person2 as Person, Period, Value2 as Val 
    FROM tablename 
    UNION ALL 
    SELECT Person3 as Person, Period, Value3 as Val 
    FROM tablename 
) sub 
GROUP BY Person, Period 

---

原來的答覆

減少問題的措施來解決。

首先正常化

SELECT Person1 as Person, Value1 as Val 
FROM tablename 
UNION ALL 
SELECT Person2 as Person, Value2 as Val 
FROM tablename 
UNION ALL 
SELECT Person3 as Person, Value3 as Val 
FROM tablename 

然後用組添加全身像正常

SELECT Person, SUM(Val) as total 
FROM (
    SELECT Person1 as Person, Value1 as Val 
    FROM tablename 
    UNION ALL 
    SELECT Person2 as Person, Value2 as Val 
    FROM tablename 
    UNION ALL 
    SELECT Person3 as Person, Value3 as Val 
    FROM tablename 
) sub 
GROUP BY Person 

Answer 2

我喜歡用apply用於此目的：

select v.person, v.period, sum(v.value) 
from t apply 
    (values (Person1, Value1, Period), 
      (Person2, Value2, Period), 
      (Person3, Value3, Period) 
    ) v(Person, Value, Period) 
group by v.person, v.period; 

Answer 3

;WITH CTE (Person , Val) AS (SELECT Person1 as Person, Value1 as Val FROM   tablename UNION ALL SELECT Person2 as Person, Value2 as Val FROM tablename UNION ALL SELECT Person3 as Person, Value3 as Val FROM tablename) SELECT Person, SUM(Val) FROM CTE GROUP BY Person