行轉列 or 行轉行

  select distinct regexp_substr('1,2,34,34,5', '[^,]+', 1, rownum) v1
  from dual
connect by rownum <=
           length('1,2,34,34,5') - length(replace('1,2,34,34,5', ',')) + 1 ;

 

以下實現行轉行(原創)。

即將

1   aa,bb,cc

2   cc,dd

轉成

1  aa

1  bb

1  cc

2  cc

2  dd

create table temp ( a number(10) , b  varchar2(300)) ;

insert into temp values( 101, '111,233,443,988328,000,23,k34');
insert into temp values( 777, '1k,88u,99ie,88j');


with temp_1 as
 (select a, length(a.b) - length(replace(a.b, ',')) + 1 numbs from temp a)
select t4.a,(
select regexp_substr(tt.b, '[^,]+', 1, t4.flg)
  from temp tt
 where tt.a = t4.a)
  from(
select t2.a, t2.numbs, sum(1) over(partition by t2.a, t2.numbs
 order by t3.r) flg
  from(
select t1.a, t1.numbs, t1.ed - t1.numbs + 1 st, t1.ed
  from(
select t.a, t.numbs, sum(t.numbs) over(
 order by t.a) ed
  from temp_1 t) t1) t2,(
select rownum r
  from dual a
connect by rownum <= (
select sum(numbs)
  from temp_1)) t3
 where r >= st and r <= ed) t4;

good article:

  http://www.cnblogs.com/killkill/archive/2010/09/06/1819536.html

  http://wang11qiang11.blog.163.com/blog/static/980301092010223105737592/