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如何串联MySQL中单个列的所有值？

2024-05-15 21:50:06 332

您可以将group_concat()与concat()并置以连接单个列的所有值。让我们首先创建一个表-

mysql> create table DemoTable
   (
   Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, FirstName varchar(20)
   );

使用插入命令在表中插入一些记录-

mysql> insert into DemoTable(FirstName) values('John');

mysql> insert into DemoTable(FirstName) values('Larry');

mysql> insert into DemoTable(FirstName) values('Chris');

mysql> insert into DemoTable(FirstName) values('Robert');

mysql> insert into DemoTable(FirstName) values('David');

使用select语句显示表中的所有记录-

mysql> select *from DemoTable;

这将产生以下输出-

+----+-----------+
| Id | FirstName |
+----+-----------+
|  1 | John      |
|  2 | Larry     |
|  3 | Chris     |
|  4 | Robert    |
|  5 | David     |
+----+-----------+
5 rows in set (0.00 sec)

以下是连接MySQL中单个列的所有值的查询。

mysql> select group_concat(concat('"', FirstName, '"')) AS FirstName from DemoTable;

这将产生以下输出-

+-----------------------------------------+
| FirstName                               |
+-----------------------------------------+
| "John","Larry","Chris","Robert","David" |
+-----------------------------------------+
1 row in set (0.05 sec)

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如何串联MySQL中单个列的所有值？

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