Oracle随笔之用拆分后的列数据关联表查询

-----------------------建表-------------------------
create table test(id int, plist varchar2(30)) ;

create table p(pid int ,pname varchar2(10));

-----------------------插入测试数据----------------------------
insert into test values(1,'28345|39262|56214');
insert into test values(2,'28345|56214');
insert into test values(3,'56214');

insert into p values(28345,'产品A');
insert into p values(39262,'产品B');
insert into p values(56214,'产品C');

-----------------------------拆分语句及结果------------------------------------

 
select id, plist,level p_level, regexp_substr(plist , '[^|]+', 1, level) pid
from test
connect by level <= regexp_count(plist , '[^|]+')
and prior id = id
and prior dbms_random.value is not null

查询结果

 

-------------------拆分后关联并拼接字符后的处理语句-------------------

with m as (

--拆分列数据
select id, plist,level p_level, regexp_substr(plist , '[^|]+', 1, level) pid
from test
connect by level <= regexp_count(plist , '[^|]+')
and prior id = id
and prior dbms_random.value is not null  
)
select m.id , m.plist, listagg(p.pname,',') within group(order by p_level) rrr
from m inner join p on m.pid = p.pid
group by m.id, m.plist ;

DROP TABLE test;
DROP TABLE P;