MYSQL基於同一表中的行划分列值

Question

我有這樣的桌子..

+-----------+------------+---------------+--------+
| ID        |  Name      | NILAI INDEKS  | SKS    |
+-----------+------------+---------------+--------+
|         3 | abc        | 3             |     4  |
|         3 | abc        | 2             |     2  |
|         3 | abc        | 3             |     4  |
|         4 | def        | 2             |     2  |
|         4 | def        | 3             |     4  |
|         4 | def        | 2             |     2  |
+-----------+------------+---------------+--------+

我想要這樣的結果，任何建議將不勝感激。 謝謝。

+-----------+------------+--------------+
| ID        |  Name      | IPS          | 
+-----------+------------+--------------|
|         3 | abc        | 1,25         |
|         4 | def        | 1,14         |
+-----------+------------+--------------+

IPS = sks 的 SUM 除以 Nilai 指數的 SUM

---

示例：IPS abc = (4+2+4) / (3+2+3) = 10/8 = 1,25

Answer 1

我找到了答案，

SELECT
    id,name,
        SUM(sks * nilai)/SUM(sks) AS IPS
FROM
    nilai
GROUP BY id
ORDER BY name