CREATE TABLE `testmysql_group_concat` (
`id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '主键',
`userid` varchar(50) DEFAULT NULL,
`name` varchar(50) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=650 DEFAULT CHARSET=utf8mb4 COMMENT='测试表'
select userid,GROUP_CONCAT(name SEPARATOR ',') from testmysql_group_concat group by userid