查询某个数据库中某个表的所有列：

SELECT COLUMN_NAME FROM information_schema.COLUMNS
WHERE TABLE_SCHEMA = 'db_name' AND TABLE_NAME = 'tb_name';

查询某个数据库中某个表的所有列名,并用逗号连接：

SELECT GROUP_CONCAT(COLUMN_NAME SEPARATOR ",") FROM information_schema.COLUMNS 
WHERE TABLE_SCHEMA = 'db_name' AND TABLE_NAME = 'tb_name';

注意：只需要替换db_name(数据库名)和tb_name(表名)