將具有相同 ID 名稱的兩行合並為一行

Question

具有相同 Id 的源表需要將它們組合成單行

            +-----+-----+-----+-----+
            | Id  | ID1 | ID2 | ID3 |
            +-----+-----+-----+-----+
            | XYZ |     |   1 |   3 |
            | ZZZ |   4 |     |   5 |
            | ZZZ |     |   6 |     |
            | XYZ |   8 |    |     |
            +-----+-----+-----+-----+

我想要達到的目標：

            +-----+-----+-----+-----+
            | Id  | ID1 | ID2 | ID3 |
            +-----+-----+-----+-----+
            | XYZ |   8 |   1 |   3 |
            | ZZZ |   4 |   6 |   5 |
            +-----+-----+-----+-----+

Answer 1

一個簡單的聚合應該可以解決問題

例子

Select ID
      ,ID1 = max(ID1)
      ,ID2 = max(ID2)
      ,ID3 = max(ID3)
 From  YourTable
 Group By ID

Answer 2

請檢查此鏈接 - MySQL 在分組后獲得第一個非 null 值

SELECT
    id,
    MAX(id1),
    MAX(id2),
    MAX(id3)
FROM
(
    SELECT
        id, id1, id2,id3
    FROM
        Test
) AS t

GROUP BY id