mysql分组并多行拼接--group_concat和groupby的使用
– 创建表结构
DROP TABLE IF EXISTS exe;
CREATE TABLE exe (
id int(3) NOT NULL,
type int(3) default NULL,
name varchar(10) default NULL,
other int(3) default NULL,
text int(255) default NULL,
PRIMARY KEY (id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
– 插入测试数据
INSERT INTO exe VALUES (‘1’, ‘1’, ‘分拼’, ‘2’, ‘1’);
INSERT INTO exe VALUES (‘2’, ‘1’, ‘四维’, ‘3’, ‘2’);
INSERT INTO exe VALUES (‘3’, ‘2’, ‘总评’, ‘1’, ‘4’);
INSERT INTO exe VALUES (‘4’, ‘3’, ‘季度’, ‘5’, ‘3’);
– group_concat和group by的使用
– 默认逗号连接
select t.type,group_concat(t.name) “result” from exe t group by t.type;
– separator指定连接符
select t.type,group_concat(t.name separator ‘;’) “result” from exe t group by t.type;
– 排序连接
select t.type,group_concat(t.name order by t.other desc) “result” from exe t group by t.type;
select t.type,group_concat(t.name order by t.other) “result” from exe t group by t.type;
– 低版本mysql连接数字会返回BLOB大对象，需要用cast()转换成char类型
select t.type,group_concat(t.name) “name”,group_concat(t.other) “result” from exe t group by t.type;
select t.type,group_concat(t.name) “name”,group_concat(CAST(t.other AS char)) “result” from exe t group by t.type;
