mysql 根据 某个字段 把一行数据拆成多行

原始表的数据





处理成的临时表的数据



最终表的数据：



代码如下： 仅供参考：

CREATE DEFINER=`data_mining`@`%` PROCEDURE `new_procedure_test`()

BEGIN

declare num int ;

declare vsql longtext;

declare count int;

set vsql='';

drop table if exists crm_excel.customer_clue_detail_temp;

create table crm_excel.customer_clue_detail_temp(id int PRIMARY KEY auto_increment

, cus_clue_id varchar(5000));

insert into crm_excel.customer_clue_detail_temp(cus_clue_id)

select replace(clue_id,'select ',concat('select ',id,' as id,')) as cus_clue_id

from

(

select id ,

replace(concat('select ', clue_id ),',',' as clue_id union all select ') as clue_id

from weixin_crm.newcrm_customer a

where clue_id like '%,%'

) a ;

select count(1) into count from crm_excel.customer_clue_detail_temp;

set @str = (select cus_clue_id from crm_excel.customer_clue_detail_temp where id=1);

set vsql=@str;

set num=2;

while num <= count do

set @str = (select cus_clue_id from crm_excel.customer_clue_detail_temp where id=num);

set vsql=concat(vsql,' union all ' , @str);

set num=num+1;

end while;

set vsql=concat('insert into crm_excel.customer_clue_detail(cus_id,clue_id)', vsql );

set @v_sql=vsql;

#select @v_sql;

prepare stmt from @v_sql;

execute stmt ;

deallocate prepare stmt;

END