SQL Question

Hi,

I need somebody help with a SQL; I have a course_schedule table which has
id      number,
course  varchar2(20),
start_time      date,
end_time        date

Here is some data

NUMB COURSE  START_NEW           END_NEW
==== ==== ======= =================== ===================
1    1191 EDU*140 2004-05-01 09:00:00 2004-05-01 12:00:00
2    1192 EDU*210 2004-05-01 08:00:00 2004-05-01 09:35:00
3    1194 EDU*213 2004-05-01 18:00:00 2004-05-01 21:00:00
4    1195 EDU*225 2004-05-01 09:35:00 2004-05-01 11:00:00
5    1196 EDU*225 2004-05-01 11:10:00 2004-05-01 12:35:00
6    1198 EDU*226 2004-05-01 14:20:00 2004-05-01 17:35:00
7    1199 EDU*226 2004-05-01 19:00:00 2004-05-01 22:15:00
8    1201 EDU*228 2004-05-01 19:00:00 2004-05-01 22:15:00
9    1204 EDU*233 2004-05-01 19:00:00 2004-05-01 22:15:00
10   1205 EDU*250 2004-05-01 09:00:00 2004-05-01 12:00:00
11   1211 ENG*010 2004-05-01 08:00:00 2004-05-01 08:55:00
12   1212 ENG*010 2004-05-01 12:45:00 2004-05-01 14:10:00
13   1213 ENG*010 2004-05-01 19:00:00 2004-05-01 22:15:00
14   1216 ENG*011 2004-05-01 08:00:00 2004-05-01 08:55:00
15   1217 ENG*011 2004-05-01 09:05:00 2004-05-01 10:00:00
16   1218 ENG*011 2004-05-01 09:05:00 2004-05-01 10:00:00
17   1219 ENG*011 2004-05-01 10:10:00 2004-05-01 11:05:00
18   1220 ENG*011 2004-05-01 10:10:00 2004-05-01 11:05:00
19   1221 ENG*011 2004-05-01 11:15:00 2004-05-01 12:10:00


what I need is a SQL which can give me non overlapping course schedules 
for a given set of courses, giving alphabetical priority to courses.

For example for a given set of courses EDU*140, ENG*010, ENG*011

ENG*010  2004-05-01 08:00:00 2004-05-01 08:55:00
EDU*140  2004-05-01 09:00:00 2004-05-01 12:00:00
ENG*010  2004-05-01 12:45:00 2004-05-01 14:10:00
ENG*010  2004-05-01 19:00:00 2004-05-01 22:15:00


I can not come up with any ideas, can some body please help?


Thanks for any ideas/help

Deen

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