如何在MySQL中将列值显示为CSV？
要将列值显示为CSV，请使用GROUP_CONCAT()。
让我们首先创建一个表-
create table DemoTable786 ( StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, StudentName varchar(100) ) AUTO_INCREMENT=101;
使用插入命令在表中插入一些记录-
insert into DemoTable786(StudentName) values('Chris');
insert into DemoTable786(StudentName) values('Robert');
insert into DemoTable786(StudentName) values('Mike');
insert into DemoTable786(StudentName) values('Sam');使用select语句显示表中的所有记录-
select *from DemoTable786;
这将产生以下输出-
+-----------+-------------+ | StudentId | StudentName | +-----------+-------------+ | 101 | Chris | | 102 | Robert | | 103 | Mike | | 104 | Sam | +-----------+-------------+ 4 rows in set (0.00 sec)
以下是在MySQL中将列选择为CSV的查询-
select group_concat(StudentId),group_concat(StudentName) from DemoTable786;
这将产生以下输出-
+-------------------------+---------------------------+ | group_concat(StudentId) | group_concat(StudentName) | +-------------------------+---------------------------+ | 101,102,103,104 | Chris,Robert,Mike,Sam | +-------------------------+---------------------------+ 1 row in set (0.00 sec)