Help in writing the query

Question

Hi All,
I have a table with below structure & Data.
{code}
CREATE TABLE SAMPLE
(PARENT VARCHAR2(100),
CHANGE VARCHAR2(100),
FLAG   VARCHAR2(10),
CHILD  VARCHAR2(100))
{code}
{code}
insert into sample values('5762','7219','A','5965');
insert into sample values('5762','7219','A','83653');
insert into sample values('5762','7219','A','62714');
insert into sample values('5762','7219','A','108258');
insert into sample values('5762','7219','A','35203');
insert into sample values('5762','7219','A','35758');
insert into sample values('5762','7219','A','104522');
insert into sample values('5762','7219','A','70087');
insert into sample values('5762','7219','A','123878');
insert into sample values('5762','7219','A','124098');
insert into sample values('5762','7219','A','124901');
insert into sample values('5762','7818','D','35758');
insert into sample values('5762','7859','D','104522');
insert into sample values('5762','8058','D','35203');
insert into sample values('5762','8058','A','43782');
{code}
I want to delete the records where the flag is 'D',also I want to delete the record if the same child had added(Flag 'A') in the earlier change orders .
For ex: child 35203 has been removed from 8058,same child had added in change 7219,which should be removed.
Output would be like this.
{code}
insert into sample values('5762','7219','A','5965');
insert into sample values('5762','7219','A','83653');
insert into sample values('5762','7219','A','62714');
insert into sample values('5762','7219','A','108258');
insert into sample values('5762','7219','A','70087');
insert into sample values('5762','7219','A','123878');
insert into sample values('5762','7219','A','124098');
insert into sample values('5762','7219','A','124901');
insert into sample values('5762','8058','A','43782');
{code}
Thanks in advance.
Regards,
Laxman

Answer 1

Like this
SQL> select * from sample;
PARENT     CHANGE     FLAG       CHILD
5762       7219       A          5965
5762       7219       A          83653
5762       7219       A          62714
5762       7219       A          108258
5762       7219       A          35203
5762       7219       A          35758
5762       7219       A          104522
5762       7219       A          70087
5762       7219       A          123878
5762       7219       A          124098
5762       7219       A          124901
5762       7818       D          35758
5762       7859       D          104522
5762       8058       D          35203
5762       8058       A          43782
15 rows selected.
SQL> delete
  2    from sample
  3   where rowid in
  4         (
  5            select rid
  6              from (
  7                      select rowid rid
  8                           , max(flag) over(partition by parent, child) max_flag
  9                        from sample
10                   )
11             where max_flag = 'D'
12         );
6 rows deleted.
SQL> select * from sample;
PARENT     CHANGE     FLAG       CHILD
5762       7219       A          5965
5762       7219       A          83653
5762       7219       A          62714
5762       7219       A          108258
5762       7219       A          70087
5762       7219       A          123878
5762       7219       A          124098
5762       7219       A          124901
5762       8058       A          43782
9 rows selected.
SQL>