转自:https://blog.csdn.net/u012620150/article/details/81945004
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 id,price 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,分号分隔
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,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;
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