group_concat函数详解

函数语法:

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

select id,price from goods;

id price
1 10
1 20
1 20
2 50
2 50
3 200

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;

id group_concat(price)
1 10,20,20
2 50,50
3 200

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;

id group_concat(price separator ';')
1 10;20;20
2 50;50
3 200

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;

id group_concat(distinct price)
1 10,20
2 50
3 200

以id分组,把price字段的值去重打印在一行,逗号分隔,按照price倒序排列

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

id group_concat(distinct price)
1 20,10
2 50
3 200

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