Problem in design the sql query

Hi,
I have following requirement on sql
table 1 time and table 2 person entry in class room
time date column
entries time date column
tab1 tab2
time room no entries_time
09:00 1 09:00
09:15 1 09:15
09.30 null null
09:45 null null
10.00 null null
I want to display last entry time for every time column, i mean output like
time room no entries_time
09:00 1 09:00
09:15 1 09:15
09.30 1 09:15
09:45 1 09:15
10.00 1 09:15
10.15 1 09:15
10.30 1 09:15
Regards,
Ram

CREATE TABLE "TAB1"
("REF_TIME" DATE NOT NULL ENABLE
Insert into TAB1 (REF_TIME) values (to_date('25-JUN-2012 12.00.00 AM','DD-MON-YYYY HH.MI.SS AM'));
Insert into TAB1 (REF_TIME) values (to_date('25-JUN-2012 12.01.00 AM','DD-MON-YYYY HH.MI.SS AM'));
Insert into TAB1 (REF_TIME) values (to_date('25-JUN-2012 12.02.00 AM','DD-MON-YYYY HH.MI.SS AM'));
Insert into TAB1 (REF_TIME) values (to_date('25-JUN-2012 12.03.00 AM','DD-MON-YYYY HH.MI.SS AM'));
Insert into TAB1 (REF_TIME) values (to_date('25-JUN-2012 12.04.00 AM','DD-MON-YYYY HH.MI.SS AM'));
Insert into TAB1 (REF_TIME) values (to_date('25-JUN-2012 12.05.00 AM','DD-MON-YYYY HH.MI.SS AM'));
Insert into TAB1 (REF_TIME) values (to_date('25-JUN-2012 12.06.00 AM','DD-MON-YYYY HH.MI.SS AM'));
Insert into TAB1 (REF_TIME) values (to_date('25-JUN-2012 12.07.00 AM','DD-MON-YYYY HH.MI.SS AM'));
Insert into TAB1 (REF_TIME) values (to_date('25-JUN-2012 12.08.00 AM','DD-MON-YYYY HH.MI.SS AM'));
Insert into TAB1 (REF_TIME) values (to_date('25-JUN-2012 12.09.00 AM','DD-MON-YYYY HH.MI.SS AM'));
Insert into TAB1 (REF_TIME) values (to_date('25-JUN-2012 12.10.00 AM','DD-MON-YYYY HH.MI.SS AM'));
Insert into TAB1 (REF_TIME) values (to_date('25-JUN-2012 12.11.00 AM','DD-MON-YYYY HH.MI.SS AM'));
Insert into TAB1 (REF_TIME) values (to_date('25-JUN-2012 12.12.00 AM','DD-MON-YYYY HH.MI.SS AM'));
Insert into TAB1 (REF_TIME) values (to_date('25-JUN-2012 12.13.00 AM','DD-MON-YYYY HH.MI.SS AM'));
Insert into TAB1 (REF_TIME) values (to_date('25-JUN-2012 12.14.00 AM','DD-MON-YYYY HH.MI.SS AM'));
Insert into TAB1 (REF_TIME) values (to_date('25-JUN-2012 12.15.00 AM','DD-MON-YYYY HH.MI.SS AM'));
Insert into TAB1 (REF_TIME) values (to_date('25-JUN-2012 12.16.00 AM','DD-MON-YYYY HH.MI.SS AM'));
Insert into TAB1 (REF_TIME) values (to_date('25-JUN-2012 12.17.00 AM','DD-MON-YYYY HH.MI.SS AM'));
Insert into TAB1 (REF_TIME) values (to_date('25-JUN-2012 12.18.00 AM','DD-MON-YYYY HH.MI.SS AM'));
Insert into TAB1 (REF_TIME) values (to_date('25-JUN-2012 12.19.00 AM','DD-MON-YYYY HH.MI.SS AM'));
Insert into TAB1 (REF_TIME) values (to_date('25-JUN-2012 12.20.00 AM','DD-MON-YYYY HH.MI.SS AM'));
Insert into TAB1 (REF_TIME) values (to_date('25-JUN-2012 12.21.00 AM','DD-MON-YYYY HH.MI.SS AM'));
Insert into TAB1 (REF_TIME) values (to_date('25-JUN-2012 12.22.00 AM','DD-MON-YYYY HH.MI.SS AM'));
commit;
CREATE TABLE "TAB2"
("ROOM_NO" NUMBER, "TIME" DATE NOT NULL ENABLE
Insert into TAB2 (ROOM_NO,TIME) values (1,to_date('25-JUN-2012 12.00.00 AM','DD-MON-YYYY HH.MI.SS AM'));
Insert into TAB2 (ROOM_NO,TIME) values (1,to_date('25-JUN-2012 12.02.00 AM','DD-MON-YYYY HH.MI.SS AM'));
Insert into TAB2 (ROOM_NO,TIME) values (1,to_date('25-JUN-2012 12.03.00 AM','DD-MON-YYYY HH.MI.SS AM'));
Insert into TAB2 (ROOM_NO,TIME) values (1,to_date('25-JUN-2012 12.04.00 AM','DD-MON-YYYY HH.MI.SS AM'));
Insert into TAB2 (ROOM_NO,TIME) values (1,to_date('25-JUN-2012 12.10.00 AM','DD-MON-YYYY HH.MI.SS AM'));
Insert into TAB2 (ROOM_NO,TIME) values (1,to_date('25-JUN-2012 12.15.00 AM','DD-MON-YYYY HH.MI.SS AM'));
commit;
output need in this format
12.00.00 AM     1     12.00.00 AM
12.01.00 AM     1     12.00.00 AM
12.02.00 AM     1     12.02.00 AM
12.03.00 AM     1     12.03.00 AM
12.04.00 AM     1     12.04.00 AM
12.05.00 AM     1     12.04.00 AM
12.06.00 AM     1     12.04.00 AM
12.07.00 AM     1     12.04.00 AM
12.08.00 AM     1     12.04.00 AM
12.09.00 AM     1     12.04.00 AM
12.10.00 AM     1     12.10.00 AM
12.11.00 AM     1     12.10.00 AM
12.12.00 AM     1     12.10.00 AM
12.13.00 AM     1     12.10.00 AM
12.14.00 AM     1     12.10.00 AM
12.15.00 AM     1     12.15.00 AM
12.16.00 AM     1     12.15.00 AM
12.17.00 AM     1     12.15.00 AM
12.18.00 AM     1     12.15.00 AM
12.19.00 AM     1     12.15.00 AM
12.20.00 AM     1     12.15.00 AM
12.21.00 AM     1     12.15.00 AM
12.22.00 AM     1     12.15.00 AM
Thanks

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<BLOCKQUOTE><font size="1" face="Verdana, Arial, Helvetica">quote:</font><HR>Originally posted by (jagdeeps):
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