Oracle行列转换

1,一行转多行

---

select t.vl,regexp_substr(t.vl,'[^;]+',1,L) as vl,L from

      (select 'A;B;C;D' vl from dual) t,--模拟数据

      (select level L from dual connect by level<=20)

    where L(+)<=length(t.vl)-length(replace(t.vl,';'))+1

---

结果：

一行转多行

---

2，多行转一列

---

select t.id ,listagg(t.vl,';') within group (order by t.id) v

  from (

    select 'A' vl,1 id from dual

    union all

    select 'B' vl,1 id from dual

    union all

    select 'C' vl,2 id from dual

    union all

    select 'D' vl,2 id from dual)t

group by t.id

---

结果:

多行转一列

---

3，多行转多列

---

select decode(instr(rs.vl,'1!'),0,null,substr(substr(rs.vl,instr(rs.vl,'1!')+2),1,instr(substr(rs.vl,instr(rs.vl,'1!')+2),';')-1)) c1,

      decode(instr(rs.vl,'2!'),0,null,substr(substr(rs.vl,instr(rs.vl,'2!')+2),1,instr(substr(rs.vl,instr(rs.vl,'2!')+2),';')-1)) c2,

      decode(instr(rs.vl,'3!'),0,null,substr(substr(rs.vl,instr(rs.vl,'3!')+2),1,instr(substr(rs.vl,instr(rs.vl,'3!')+2),';')-1)) c3,

      decode(instr(rs.vl,'4!'),0,null,substr(substr(rs.vl,instr(rs.vl,'4!')+2),1,instr(substr(rs.vl,instr(rs.vl,'4!')+2),';')-1)) c4

from(

    select  listagg(id || '!' || t.vl || ';','')  within group (order by t.id) vl

      from (

        select 'A' vl,1 id from dual

        union all

        select 'B' vl,2 id from dual

        union all

        select 'C' vl,3 id from dual

        union all

        select 'D' vl,4 id from dual)t

    )rs

---

结果：

多行转多列