Question

我有以下格式的MySQL表。这是我运行的程序的输出，我无法更改它。

+---+------------------------+
|   |  A    B   C   D    E   |
+---+------------------------+
|   | model amz wmt abt tgt  |
| 1 | c3000 100              |
| 2 | c3000     200          |
| 3 | c3000         150      |
| 4 | c3000              125 |
| 5 | A1234              135 |
| 6 | A1234     105          |
+---+------------------------+

我想根据第1列中的值（即model）将所有行移动到一行中。需要注意的是，空行实际上并不是空白，而是包含空字符

期望的输出：

+---+-----------------------+
|   |  A    B   C   D    E  |
+---+-----------------------+
|   | model amz wmt abt tgt |
| 1 | c3000 100 200 150 125 |
| 2 | A1234 200 105     135 |
+---+-----------------------+

我尝试使用

select model,group_concat(wmt),group_concat(amz)     
from table_name
group by model

我得到的输出充满了逗号

+---+----------------------------------+
|   |  A                  B            |
+---+----------------------------------+
|   | model  amz          wmt          |
| 1 | c3000  ,,,,100,,,,   ,,,200,,,,  |
| 2 | A1234  ,,200,,,,,,  ,105,,,,,,   |
+---+----------------------------------+

Answer 1

SELECT
   model,
   MIN(amz) AS amz,
   MIN(wmt) AS wmt,
   MIN(abt) AS abt,
   MIN(tgt) AS tgt
FROM
   table_name
GROUP BY
   model

Answer 2

您可以使用TRIM和IF将空值转换为空。

SELECT 
    model,
    GROUP_CONCAT(IF(TRIM(wmt) = '', NULL, wmt)),
    GROUP_CONCAT(IF(TRIM(amz) = '', NULL, amz))
FROM
    table_name
GROUP BY model

MySQL：根据列值将数据从多行移动到一行

2 个答案: