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_index(a.related_shop_ids,','
    ,b.help_topic_id+1),',',-1) shopid
  from 
    sales_hang_account a
  join
    mysql.help_topic b
    on b.help_topic_id < (length(a.related_shop_ids) -   length(replace(a.related_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_index(a.related_shop_ids,','
    ,b.help_topic_id+1),',',-1) shopid
  from 
    sales_hang_account a
  join
    mysql.help_topic b
    on b.help_topic_id < (length(a.related_shop_ids) -   length(replace(a.related_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_index(a.related_shop_ids,','
    ,b.help_topic_id+1),',',-1) shopid
  from 
    sales_hang_account a
  join
    mysql.help_topic b
    on b.help_topic_id < (length(a.related_shop_ids) -   length(replace(a.related_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_id,g.related_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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