mysql中把selct中的数据列表转换成逗号分隔的字符串

CREATE TABLE `shoufei` (  `id` int(11) NOT NULL AUTO_INCREMENT,  `shijian` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,  `xiangmu` varchar(20) NOT NULL,  `jiage` float NOT NULL,  `shuliang` int(11) NOT NULL,  `jine` float DEFAULT NULL,  PRIMARY KEY (`id`)) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=utf8

SELECT GROUP_CONCAT(xiangmu) FROM shoufei;

SELECT GROUP_CONCAT(DISTINCT shuliang) FROM shoufei;

SELECT GROUP_CONCAT(xiangmu SEPARATOR ‘-‘) FROM shoufei;

SELECT GROUP_CONCAT(xiangmu ORDER BY xiangmu ASC SEPARATOR ‘-‘) FROM shoufei;