MySQL將一個欄位中以逗號分隔的取出來形成新的欄位
阿新 • • 發佈:2018-10-31
1例如:要把如圖1的欄位拆分圖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:然後和shops表進行連線查詢取出我們需要的欄位,我這裡需要取出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:將 account_id相同合併成一行,以逗號隔開
//這兩個是網上的例子 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;//藉助上面兩個參考 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