MySQL将⼀个字段中以逗号分隔的取出来形成新的字段实现1例如：要把如图1的字段拆分图2
select account_id,
substring_index(substring_lated_shop_ids,','
,b.help_topic_id+1),',',-1) shopid
from
sales_hang_account a
join
mysql.help_topic b
on b.help_topic_id < (lated_shop_ids) -  length(lated_shop_ids,',',''))+1)
order by a.account_id
2：然后和shops表进⾏连接查询取出我们需要的字段，我这⾥需要取出name
select s.`name` as shopname,a.account_id from shops s
inner JOIN (
select account_id,
substring_index(substring_lated_shop_ids,','
,
b.help_topic_id+1),',',-1) shopid
from
sales_hang_account a
join
mysql.help_topic b
on b.help_topic_id < (lated_shop_ids) -  length(lated_shop_ids,',',''))+1)
order by a.account_id)a on s.shop_id=a.shopid
3：将 account_id相同合并成⼀⾏，以逗号隔开
//这两个是⽹上的例⼦
select ID,group_concat(NAME) as NAME from table group by ID;
select ID,group_concat(NAME SEPARATOR ';') as NAME from a group by ID;
//借助上⾯两个参考
select account_id,GROUP_CONCAT(shopname SEPARATOR',')as shopname from (select s.`name` as shopname,a.account_id from shops s
inner JOIN (
select account_id,
substring_index(substring_lated_shop_ids,','
,b.help_topic_id+1),',',-1) shopid
from
sales_hang_account a
mysql group by order by
join
mysql.help_topic b
on b.help_topic_id < (lated_shop_ids) -  length(lated_shop_ids,',',''))+1)
order by a.account_id)a on s.shop_id=a.shopid) a GROUP BY account_id
效果如下
第⼆种⽅法
select g.account_lated_shop_ids,GROUP_CONCAT(s.name)as shopname from sales_hang_account g left join shops s on FIND_IN_SET(s.shop_id , g.related_shop_ids) GROUP BY g.account_id
SqlServer
[Product] -- 该字段存储格式为 7,8,9,11,10,12 ，数据类型为nvarchar
select id,ProductName=stuff((select ',' + product_chinaname from base_supplier_product where charindex(','+ltrim(productid)+',',','+ Product + ',') > 0 for xml path('') ), 1, 1, '')
FROM base_Pre_sale_project
结果
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