1,将分组之后的string字符合并起来。如下所示:
select distinct item_id,array_join(array_agg(distinct name),',')
from shmods.mysql_shop_item_cids a
inner join shmods.mysql_s__categories b
on cid=b.id
where a.item_id = '8299155472'
group by item_id
array_agg()将分组之后的数据合并成list; array_join(,',')将list数据合并起来并用','合并成字符串;
参考地址:https://help.aliyun.com/document_detail/64035.html?spm=a2c4g.11186623.3.3.a7444bdadYqCz9