Select one record for each member of the group

Hi,
am having a table where in i will be having data for so many group members. i need to fetch data for a particular group members whose number of rows of data may be more in numbers (but i want only one row of data for each member of the group)
here is the query for fetching all rows of data
select RI.RESOURCE_NAME,TR.MSISDN,TR.ADDRESS1_GOOGLE, TR.MSG_DATE_INFO, FROM TRACKING_REPORT TR, RESOURCE_INFO RI
WHERE TR.MSISDN IN (SELECT MSISDN FROM RESOURCE_INFO WHERE GROUP_ID ='1' AND COM_ID=2 ) AND RI.MSISDN=TR.MSISDN
order by MSG_DATE_INFOoutput of this query is...
>
ddd     12345          13-Mar-10 19:43:03
eee     54321     Tamil Nadu, India      13-Mar-10 19:39:48
ddd     12345          13-Mar-10 19:32:58
eee     54321     Tamil Nadu, India      13-Mar-10 19:30:07
ddd     12345          13-Mar-10 19:23:08
eee     54321     Tamil Nadu, India      13-Mar-10 19:20:14
fff     98765          13-Mar-10 19:19:22
ddd     12345          13-Mar-10 19:13:01
eee     54321     Tamil Nadu, India      13-Mar-10 19:09:50
ddd     12345          13-Mar-10 19:02:56
eee     54321     tn,ind      13-Mar-10 18:59:49
ddd     12345          13-Mar-10 18:53:08
eee     54321     tn,ind      13-Mar-10 18:49:50
ddd     12345          13-Mar-10 18:42:56
eee     54321     tn,ind      13-Mar-10 18:39:50
ddd     12345          13-Mar-10 18:33:00
eee     54321     tn,ind      13-Mar-10 18:29:50
ddd     12345          13-Mar-10 18:22:54
eee     54321     tn,ind      13-Mar-10 18:19:50
ddd     12345          13-Mar-10 18:12:56
eee     54321     tn,ind      13-Mar-10 18:09:50
ddd     12345          13-Mar-10 18:02:54
eee     54321     tn,ind      13-Mar-10 18:00:02
fff     98765     Tamil Nadu, India      13-Mar-10 17:59:26
fff     98765     Tamil Nadu, India      13-Mar-10 17:54:26
ddd     12345          13-Mar-10 17:52:56
eee     54321     tn,ind      13-Mar-10 17:49:50
fff     98765     Tamil Nadu, India      13-Mar-10 17:49:25
fff     98765     Tamil Nadu, India      13-Mar-10 17:44:26
ddd     12345          13-Mar-10 17:42:56
>
from this output i want only one latest record for each member(ddd,eee,fff). i.e
>
ddd     12345          13-Mar-10 19:43:03
eee     54321     Tamil Nadu, India      13-Mar-10 19:39:48
fff     98765          13-Mar-10 19:19:22
>
how to modify the query to achieve this...?

Hi,
This is not giving the result which i want...
table is
CREATE TABLE TRACKING_REPORT
ID               NUMBER,
MSISDN           NUMBER(12)                   NOT NULL,
X                NUMBER(15,8)                 NOT NULL,
Y                NUMBER(15,8)                 NOT NULL,
TIME_STAMP       DATE,
MSG_DATE_INFO    DATE                         DEFAULT sysdate,
ADDRESS1_GOOGLE VARCHAR2(400 BYTE),
ADDRESS2_GOOGLE VARCHAR2(400 BYTE),
ADDRESS_MLINFO   VARCHAR2(400 BYTE),
REQ_ID           VARCHAR2(30 BYTE)
CREATE TABLE RESOURCE_INFO
RESOURCE_ID    NUMBER,
MSISDN         NUMBER,
RESOURCE_NAME VARCHAR2(25 BYTE),
ADDRESS        VARCHAR2(100 BYTE),
COM_ID         VARCHAR2(20 BYTE),
ADMIN_ID       NUMBER,
TIME_STAMP     DATE                           DEFAULT SYSDATE,
GROUP_ID       NUMBER
)

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