mysql - 如果从顶部开始相同，如何隐藏/删除行中的数据

Question

我有像这样来自 mysql 查询的表事务。

 ____________________________________________________________
 | id | noskom      | nonpbm     |    noskop   |    npbp     |
 |____|_____________|____________|_____________|_____________|
 |  1 | 001         |   10       |       20    |       20    |
 |  2 | 001         |   20       |       10    |       20    |
 |  3 | 002         |    5       |       10    |       20    |
 |  4 | 003         |   30       |        5    |       20    |
 |____|_____________|____________|_____________|_____________|

我想要结果

 select sum(nonpbm),sum(noskop),sum(npbp) from transaction group by noskom

 ____________________________________________________________
 | id | noskom      | nonpbm     |    noskop   |    npbp     |
 |____|_____________|____________|_____________|_____________|
 |  1 | 001         |   30       |       30    |       40    |
 |  2 |             |            |             |             |
 |  3 | 002         |    5       |       10    |       20    |
 |  4 | 003         |   30       |        5    |       20    |
 |____|_____________|____________|_____________|_____________|

什么是mysql查询

Answer 1

SELECT 
    noskom , 
    SUM(nonpbm) as nonpbm , 
    sum(noskop) as noskop , 
    sum(npbp) as  npbp
FROM mytable 
GROUP BY noskom 

如果要列出对聚合值有贡献的所有行的 ID，还可以添加此列:

GROUP_CONCAT(id ORDER BY id) AS id

这将为您提供一个以逗号分隔的 ID 列表。您可以指定不同的分隔符，例如 EOL:

GROUP_CONCAT(id ORDER BY id SEPARATOR '\r\n') AS id

'\r\n' 是 Windows 世界中的标准行分隔符。如果您在不同的平台上，请更改为 '\n' 或 '\r'。