Deleting Duplicate records ::(Please reply to it ::)

Hi experts i am new to the oracle .Please me with this delete query .
When ever the mobileno in TEST_REG,TEST_MUL matches then it has to check for accountno gets duplicated in TEST_MUL table .
If duplicate accounts are there for that particular mobileno
Then it has to delete that duplicate accountno whose ids are not equal in both the
tables (those accountno records should get deleted from test_mul table)
Script For the query :
create table test_mul (mobileno VARCHAR2 (20 Byte),accountno VARCHAR2 (20 Byte),id VARCHAR2 (12 Byte),v_date date);
create table test_reg (mobileno VARCHAR2 (20 Byte),id VARCHAR2 (12 Byte),r_date date,mas varchar2(1) default 'Y');
alter table test_mul modify v_date default sysdate;
alter table test_reg modify r_date default sysdate;
Insertion of records into test_reg table :
insert into test_reg (mobileno,id) values ('+227299001081','AAA');
insert into test_reg (mobileno,id) values ('+911000000001','BBB');
insert into test_reg (mobileno,id) values ('+911000000002','CCC');
insert into test_reg (mobileno,id) values ('+911000000005','DDD');
insert into test_reg (mobileno,id) values ('+911000000006','EEE');
insert into test_reg (mobileno,id) values ('+911000000007','FFF');
commit;
==================================================================
INSERT INTO TEST_MUL(mobileno,accountno,id) VALUES ('+227299001081','37775521122561','AAA');
INSERT INTO TEST_MUL(mobileno,accountno,id) VALUES ('+227299001081','37775521122561','123');
INSERT INTO TEST_MUL(mobileno,accountno,id) VALUES ('+227299001081','43443345432344','AAA');
INSERT INTO TEST_MUL(mobileno,accountno,id) VALUES ('+227299001081','43443345432344','AAA');
INSERT INTO TEST_MUL(mobileno,accountno,id) VALUES ('+911000000001','08490100005169','BBB');
INSERT INTO TEST_MUL(mobileno,accountno,id) VALUES ('+911000000001','08490100006867','BBB');
INSERT INTO TEST_MUL(mobileno,accountno,id) VALUES ('+911000000001','08490100009602','BBB');
INSERT INTO TEST_MUL(mobileno,accountno,id) VALUES ('+911000000001','08490100009602','456');
INSERT INTO TEST_MUL(mobileno,accountno,id) VALUES ('+911000000005','47775524511505','DDD');
INSERT INTO TEST_MUL(mobileno,accountno,id) VALUES ('+911000000002','47775521111505','DDD');
INSERT INTO TEST_MUL(mobileno,accountno,id) VALUES ('+911000000002','47775524511505','789');
INSERT INTO TEST_MUL(mobileno,accountno,id) VALUES ('+911000000006','47775545611506','EEE');
INSERT INTO TEST_MUL(mobileno,accountno,id) VALUES ('+911000000006','47775521111506','EEE');
INSERT INTO TEST_MUL(mobileno,accountno,id) VALUES ('+911000000007','47987521111507','FFF');
INSERT INTO TEST_MUL(mobileno,accountno,id) VALUES ('+911000000007','47775521111507','FFF');
INSERT INTO TEST_MUL(mobileno,accountno,id) VALUES ('+911000000007','47775521111507','987');
commit;Edited by: 980560 on Jan 26, 2013 7:56 PM

Something like this?
Go through the complete workout :
Ranit>> select *
2 from
3      test_mul;
MOBILENO             ACCOUNTNO            ID           V_DATE
+227299001081        37775521122561       AAA          26-JAN-13
+227299001081        37775521122561       123          26-JAN-13
+227299001081        43443345432344       AAA          26-JAN-13
+227299001081        43443345432344       AAA          26-JAN-13
+911000000001        08490100005169       BBB          26-JAN-13
+911000000001        08490100006867       BBB          26-JAN-13
+911000000001        08490100009602       BBB          26-JAN-13
+911000000001        08490100009602       456          26-JAN-13
+911000000005        47775524511505       DDD          26-JAN-13
+911000000002        47775521111505       DDD          26-JAN-13
+911000000002        47775524511505       789          26-JAN-13
+911000000006        47775545611506       EEE          26-JAN-13
+911000000006        47775521111506       EEE          26-JAN-13
+911000000007        47987521111507       FFF          26-JAN-13
+911000000007        47775521111507       FFF          26-JAN-13
+911000000007        47775521111507       987          26-JAN-13
16 rows selected.
Ranit>> select *
2 from
3      test_reg;
MOBILENO             ID           R_DATE    M
+227299001081        AAA          26-JAN-13 Y
+911000000001        BBB          26-JAN-13 Y
+911000000002        CCC          26-JAN-13 Y
+911000000005        DDD          26-JAN-13 Y
+911000000006        EEE          26-JAN-13 Y
+911000000007        FFF          26-JAN-13 Y
6 rows selected.
Ranit>> select m.*
2 from
3      test_reg r, test_mul m
4 where
5      r.mobileno = m.mobileno
6 and
7      r.id != m.id;
MOBILENO             ACCOUNTNO            ID           V_DATE
+227299001081        37775521122561       123          26-JAN-13
+911000000001        08490100009602       456          26-JAN-13
+911000000002        47775521111505       DDD          26-JAN-13
+911000000002        47775524511505       789          26-JAN-13
+911000000007        47775521111507       987          26-JAN-13
Ranit>> delete from test_mul m
2 where (mobileno,id) != (
3 select r.mobileno,r.id
4 from
5      test_reg r
6 where
7      r.mobileno = m.mobileno
8 and
9      r.id != m.id
10 );
5 rows deleted.
Ranit>> select *
2 from
3 test_mul;
MOBILENO             ACCOUNTNO            ID           V_DATE
+227299001081        37775521122561       AAA          26-JAN-13
+227299001081        43443345432344       AAA          26-JAN-13
+227299001081        43443345432344       AAA          26-JAN-13
+911000000001        08490100005169       BBB          26-JAN-13
+911000000001        08490100006867       BBB          26-JAN-13
+911000000001        08490100009602       BBB          26-JAN-13
+911000000005        47775524511505       DDD          26-JAN-13
+911000000006        47775545611506       EEE          26-JAN-13
+911000000006        47775521111506       EEE          26-JAN-13
+911000000007        47987521111507       FFF          26-JAN-13
+911000000007        47775521111507       FFF          26-JAN-13
11 rows selected.Please let us know if this helps and meets your requirement.

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