mysql一行转多行加上一行转多列

看到群里有人有个sql不会写，平时mysql复杂写的少，就简单写了写。虽然写的很烂，但是思路还可以。。

create table t1(
    xid varchar(10) , 
    Name varchar(20), 
    Code varchar(100)  
);

create table t2(
    yid varchar(10) , 
    Name varchar(20), 
    je varchar(10)    
);

											
insert into t1(xid,Name,Code) values('1','a','[a1][1]+[b2][2]');	
insert into t1(xid,Name,Code) values('2','b','[b2][3]');			
insert into t1(xid,Name,Code) values('3','c','[c3][3]+[a1][1]');	

insert into t2(yid,name,je) values ('a1','瓜子','1.5');
insert into t2(yid,name,je) values ('b2','花生','1');
insert into t2(yid,name,je) values ('c3','板栗','2');

他需要这样的结果：

思路如下：

select t.xid,t.name,REPLACE(REPLACE(REPLACE(REPLACE(t.code,"]+[",","),"][",":"),"[",""),"]","") as rn from t1 t 

select t.xid,t.name,substring_index(
        substring_index(
            t.rn,
            ',',
            b.help_topic_id + 1
        ),
        ',' ,- 1
    ) AS rn from (select t.xid,t.name,REPLACE(REPLACE(REPLACE(REPLACE(t.code,"]+[",","),"][",":"),"[",""),"]","") as rn from t1 t )t
JOIN mysql.help_topic b ON b.help_topic_id <
(length(t.rn) - length( replace(t.rn, ',', '')  ) + 1)

select tt.xid,tt.name,SUBSTR(tt.rn,1,2) as yid,SUBSTR(tt.rn,4,LENGTH(tt.rn)) as num from 
(select t.xid,t.name,substring_index(
        substring_index(
            t.rn,
            ',',
            b.help_topic_id + 1
        ),
        ',' ,- 1
    ) AS rn from (select t.xid,t.name,REPLACE(REPLACE(REPLACE(REPLACE(t.code,"]+[",","),"][",":"),"[",""),"]","") as rn from t1 t )t
JOIN mysql.help_topic b ON b.help_topic_id <
(length(t.rn) - length( replace(t.rn, ',', '')  ) + 1)) tt

select t3.xid,t3.name,t2.`Name`,t2.je,t3.num from 
(select tt.xid,tt.name,SUBSTR(tt.rn,1,2) as yid,SUBSTR(tt.rn,4,LENGTH(tt.rn)) as num from 
(select t.xid,t.name,substring_index(
        substring_index(
            t.rn,
            ',',
            b.help_topic_id + 1
        ),
        ',' ,- 1
    ) AS rn from (select t.xid,t.name,REPLACE(REPLACE(REPLACE(REPLACE(t.code,"]+[",","),"][",":"),"[",""),"]","") as rn from t1 t )t
JOIN mysql.help_topic b ON b.help_topic_id <
(length(t.rn) - length( replace(t.rn, ',', '')  ) + 1)) tt)t3
INNER JOIN t2 
on t3.yid = t2.yid