MySQL 如何将列值显示为CSV格式

要将列值显示为CSV，请使用GROUP_CONCAT（）。

首先，让我们创建一个表 –

mysql> create table DemoTable786 (
   StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   StudentName varchar(100)
)  
AUTO_INCREMENT=101;
Query OK，0 rows affected (0.70 sec)

使用insert命令将一些记录插入到表中 –

mysql> insert into DemoTable786(StudentName) values('Chris');
Query OK，1 row affected (0.13 sec)
mysql> insert into DemoTable786(StudentName) values('Robert');
Query OK，1 row affected (0.24 sec)
mysql> insert into DemoTable786(StudentName) values('Mike');
Query OK，1 row affected (0.15 sec)
mysql> insert into DemoTable786(StudentName) values('Sam');
Query OK，1 row affected (0.12 sec)

使用select语句从表中显示所有记录 –

mysql> select *from DemoTable786;

将会产生以下输出 –

+-----------+-------------+
| StudentId | StudentName |
+-----------+-------------+
| 101       | Chris       |
| 102       | Robert      |
| 103       | Mike        |
| 104       | Sam         |
+-----------+-------------+
4 rows in set (0.00 sec)

以下查询通过MySQL将选择列作为CSV –

mysql> select group_concat(StudentId),group_concat(StudentName) from DemoTable786;

将会产生以下输出 –

+-------------------------+---------------------------+
| group_concat(StudentId) | group_concat(StudentName) |
+-------------------------+---------------------------+
| 101,102,103,104         | Chris,Robert,Mike,Sam     |
+-------------------------+---------------------------+
1 row in set (0.00 sec)

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