MySQL将一个字段中以逗号分隔的取出来形成新的字段实现
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2022-06-19 12:53:26
1例如:要把如图1的字段拆分图2select account_id, substring_index(substring_index(a.related_shop_ids,',' ,b.h...
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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