mysql之group_concat函數詳解

轉自：https://blog.csdn.net/u012620150/article/details/81945004

函數語法：

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

下面舉例說明：

select id,price from goods; 

以id分組，把price字段的值在同一行打印出來，逗號分隔(默認)

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

以id分組，把price字段的值在一行打印出來，分號分隔

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

以id分組，把去除重復冗余的price字段的值打印在一行，逗號分隔

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

以id分組，把price字段的值去重打印在一行，逗號分隔，按照price倒序排列

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