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MySQL查询将concat分组以Id区分？

2024-05-17 19:09:29 434

让我们首先创建一个表-

create table DemoTable
(
   Id int,
   Name varchar(100)
);

使用插入命令在表中插入一些记录-

insert into DemoTable values(100,'Chris');
insert into DemoTable values(200,'Robert');
insert into DemoTable values(100,'Chris');
insert into DemoTable values(300,'David');
insert into DemoTable values(400,'Mike');
insert into DemoTable values(400,'Mike');

使用select语句显示表中的所有记录-

select *from DemoTable;

这将产生以下输出-

+------+--------+
| Id   | Name   |
+------+--------+
|  100 | Chris  |
|  200 | Robert |
|  100 | Chris  |
|  300 | David  |
|  400 | Mike   |
|  400 | Mike   |
+------+--------+
6 rows in set (0.00 sec)

以下是对ID为不同的MySQL组Concat的查询-

select group_concat(Name)
from
(
   select distinct Id,Name from DemoTable
)
tbl;

这将产生以下输出-

+-------------------------+
| group_concat(Name)      |
+-------------------------+
| Chris,Robert,David,Mike |
+-------------------------+
1 row in set (0.00 sec)

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MySQL查询将concat分组以Id区分？

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