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'])

下面举例说明:

select * from goods;

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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;

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以id分组,把price字段的值在一行打印出来,分红分隔

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

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以id分组,把去除重复冗余的price字段的值打印在一行,以逗号分隔

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

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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;