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

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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

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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

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//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

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1 2	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

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[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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原文链接：https://www.cnblogs.com/weixin18/p/9827222.html