Update records and make them unique

Question

Hi All,
I want to take records from on column and then update another with those records.
But I want the second column to contain unique values:
create table test (a varchar2(10), b varchar2(10))
insert into test (a,b) values ('one',null);
insert into test (a,b) values ('one',null);
insert into test (a,b) values ('two',null);
insert into test (a,b) values ('three',null);
insert into test (a,b) values ('four',null);
insert into test (a,b) values ('five',null);
insert into test (a,b) values ('six',null);
insert into test (a,b) values ('seven',null);
insert into test (a,b) values ('seven',null);
insert into test (a,b) values ('eight',null);
insert into test (a,b) values ('nine',null);
insert into test (a,b) values ('ten',null);
The update should look like this:
one      one(1)
one     one(2)
two     two
three     three
four     four
five     five
six     six
seven seven(1)
seven seven(2)
eight eight
nine     nine
ten     ten

Answer 1

Or...
SQL> merge into test a
  2  using (select rowid rwd,
  3                row_number() over (partition by regexp_replace(regexp_replace(a,' [^[:alnum:]]*', '-'),'^-|-$') order by null) rn,
  4                count(*)     over (partition by regexp_replace(regexp_replace(a,' [^[:alnum:]]*', '-'),'^-|-$') order by null) ct
  5         from   test) b
  6  on    (a.rowid=b.rowid)
  7  when matched then update set a.b=regexp_replace(regexp_replace(a.a,' [^[:alnum:]]*', '-'),'^-|-$')||decode(ct,1,null,'('||rn||')');
15 rows merged.
SQL> select * from test;
A                                                  B
one                                                one(1)
one                                                one(2)
two                                                two
three                                              three
four                                               four
five                                               five
six                                                six
seven                                              seven(1)
seven                                              seven(2)
eight                                              eight
nine                                               nine
ten                                                ten
this is a test of Rob's magic % &&                this-is-a-test-of-Rob's-magic(2)
this is a test of Rob's magic % &                 this-is-a-test-of-Rob's-magic(1)
this is a test of Rob's magic %                   this-is-a-test-of-Rob's-magic(3)
15 rows selected.Nicolas.