mysql把一字段拆分为多行

一：数据库 二：sql语句 select a.house_no as '房子',substring_index(substring_index(a.name,',',b.help_topic_id+1),',',-1) as '拥有者'  from  aa a join   mysql.help_topic b on b.help_topic_id < (length(a.name) - leng

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