【MySQL】MySQL的group_concat使用例子

> 参考的优秀文章

GROUP_CONCAT(expr)

> 简单的例子

此函数的功能，是拼接group分组多行的数据为一行，并可以指定去重、排序、分隔符。

例子：

select t.name, group_concat(distinct t.role order by t.sort asc separator ‘;‘) from
(
select ‘Nick‘ as name, ‘coder‘ as role, 1 as sort
union all
select ‘Nick‘ as name, ‘admin‘ as role, 3 as sort
union all
select ‘Nick‘ as name, ‘admin‘ as role, 2 as sort
union all
select ‘Viki‘ as name, ‘coder‘ as role, 1 as sort
union all
select ‘Viki‘ as name, ‘admin‘ as role, 2 as sort
union all
select ‘Viki‘ as name, ‘player‘ as role, 3 as sort
union all
select ‘Darren‘ as name, ‘admin‘ as role, 2 as sort
union all
select ‘Darren‘ as name, ‘player‘ as role, 1 as sort
) t
group by t.name;

结果：