mysql group_concat函数详解

Posted 2021-01-27 chenze-index

group_concat( [DISTINCT]  要连接的字段   [Order BY 排序字段 ASC/DESC]   [Separator ‘分隔符‘] )

1.

--以id分组，把price字段的值在同一行打印出来，逗号分隔(默认)

select id, group_concat(price) from goods group by id;  

2.

--以id分组，把price字段的值在一行打印出来，分号分隔 

select id,group_concat(price separator ‘;‘) from goods group by id; 

3.

--以id分组，把去除重复冗余的price字段的值打印在一行，逗号分隔
select id,group_concat(distinct price) from goods group by id;  

4.

--以id分组，把price字段的值打印在一行，逗号分隔，按照price倒序排列
select id,group_concat(price order by price desc) from goods group by id;