Select 单列中的多行由换行符分隔

Question

我有一个 table，其值如下所示。

    Id Name Fruit
    ------------
    1 Jon  Apple
    ------------
    2 Jon  Orange
    ------------
    3 Jon  Grape
    ------------
    4 Mike Apple
    ------------
    5 Mike Orange
    -------------

如何在 mysql 中将列区分为这样的内容？

    Name Fruit
    ----------
    Jon  Apple
         Orange
         Grape
    -----------
    Mike Apple
         Orange
    -----------

Answer 1

应该这样做

SELECT name, GROUP_CONCAT(fruit SEPARATOR '\n') FROM your_table GROUP BY name

Demo in db<>fiddle

更新以添加编号：

SELECT name ,
       GROUP_CONCAT(CONCAT (rn,')',fruit) SEPARATOR '\n')
FROM (
    SELECT * 
        ,ROW_NUMBER() OVER (PARTITION BY name) AS rn
    FROM your_table
    ) SQ
GROUP BY name

Demo with numbering in db<>fiddle

Answer 2

另一种选择也是使用 joins 来实现此要求。

select 
    case when t1.id = t2.id then t1.name else '' end 
    , t3.fruits
from 
    (select min(id) id, name from testA
        group by name) t1
left join
    testA t2 on t2.name = t1.name
left join
    testA t3 on t3.id = t2.id
order by t2.id asc

参见 dbfiddle。

Select 单列中的多行由换行符分隔

Select Multiple rows in single column separated by New Line

mysql

sql

group-concat