把以逗号分隔的字符串转换成行

业务表：

DROP table if EXISTS tbl_code;
CREATE TABLE tbl_code(
id int(11) not null auto_increment,
code varchar(100) not null,
PRIMARY KEY(id)
)ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;

insert into tbl_code values (1,'1,2,3,4,5');
insert into tbl_code values (2,'6,7,8,9');

序列表：

DROP table if EXISTS tbl_id;
CREATE TABLE tbl_id(
id int(11) not null,
PRIMARY KEY(id)
)ENGINE=InnoDB DEFAULT CHARSET=utf8;

insert into tbl_id values (0);

insert into tbl_id values (1);

insert into tbl_id values (2);

insert into tbl_id values (3);

insert into tbl_id values (4);

insert into tbl_id values (5);

insert into tbl_id values (6);

insert into tbl_id values (7);

insert into tbl_id values (8);

insert into tbl_id values (9);

insert into tbl_id values (10);

SELECT a.id,
SUBSTRING_INDEX(SUBSTRING_INDEX(a.code, ',', b.id+ 1), ',', -1) as code
from `tbl_id` a
left join `tbl_id` b on b.id<(LENGTH(a.`code`) - LENGTH( REPLACE(a.`code`, ',', ''))+ 1);

注意：tbl_id 序列表中的记录需要足够多，且必须从0开始，否则会转换不全。

标签：insert,code,分隔,into,逗号,values,tbl,id,成行
来源： https://www.cnblogs.com/donghuimao/p/14913170.html