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将多行合并到MySQL中以逗号分隔的列表中？

2024-05-17 23:12:04 407

要将多行合并为一个逗号分隔的列表，请使用GROUP_CONCAT()方法。让我们首先创建一个表-

create table DemoTable
   (
   Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   Name varchar(30),
   Marks int
   );

使用插入命令在表中插入一些记录-

insert into DemoTable(Name,Marks) values('John',67);
insert into DemoTable(Name,Marks) values('Carol',69);
insert into DemoTable(Name,Marks) values('Sam',69);
insert into DemoTable(Name,Marks) values('David',78);
insert into DemoTable(Name,Marks) values('Chris',69);
insert into DemoTable(Name,Marks) values('Bob',67);

使用select语句显示表中的所有记录-

select *from DemoTable;

输出结果

+----+-------+-------+
| Id | Name  | Marks |
+----+-------+-------+
| 1  | John  | 67    |
| 2  | Carol | 69    |
| 3  | Sam   | 69    |
| 4  | David | 78    |
| 5  | Chris | 69    |
| 6  | Bob   | 67    |
+----+-------+-------+
6 rows in set (0.00 sec)

以下是将多行合并为MySQL中逗号分隔列表的查询-

SELECT Marks, GROUP_CONCAT(Name ORDER BY Name ASC SEPARATOR ', ')
   from DemoTable GROUP BY Marks;

输出结果

+-------+-----------------------------------------------------+
| Marks | GROUP_CONCAT(Name ORDER BY Name ASC SEPARATOR ', ') |
+-------+-----------------------------------------------------+
| 67    | Bob, John                                           |
| 69    | Carol, Chris, Sam                                   |
| 78    | David                                               |
+-------+-----------------------------------------------------+
3 rows in set (0.00 sec)

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将多行合并到MySQL中以逗号分隔的列表中？

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