Question about using pl/sql to mark records in a table

I have a table where I have stored college course's details,
the pertinent for this questions are the fields:
course_number,
alt_id1,
alt_id2,
cross_relation,
What I need to do is to identify cross-listed courses (those that have an alt_id1 not null) and set the first one found to be parent in the cross_relation column, then read alt_id1 and alt_id2 and set them as children in the cross_relation column.
example: what I have (these are in no particular order)
course_number alt_id1 alt_id2 cross_relation
en101 | mu101 | hs101 |
mu101 | en101 | hs101 |
hs101 | en101 | mu101 |
what I want: Finds cross listed set it as P for parent and then finds its children an marks them as its children C.
course_number | alt_id1 | alt_id2 | cross_relation
en101 | mu101 | hs101 | P
mu101 | en101 | hs101 | C
hs101 | en101 | mu101 | C
I have tried different things with different results but not the one desired,
Please, I just need some idea on how to accomplish this.
Thank you

Sniff... sniff... sure smells like homework to me.
You're likely looking for a hierachical SQL to determine the parent-child hierachy.
http://download-east.oracle.com/docs/cd/B19306_01/server.102/b14200/pseudocolumns001.htm#i1009313

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"Sandeep Suri" <[email protected]> wrote in message
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Hi, I have quick question about use of USEBEAN tag in SP2. When I
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