Need to concatonate multiple values for same key columns into one string

Hi...I'm attempting to use PL/SQL to read through a table containing more than one column value for a set of keys, and concatonate those values together into one string. For example, in the STUDENT table, for a STUDENT_ID there are multiple MAJORS_ACCOMPLISHED such as History, Biology and Mathematics. Each of the majors is stored in a different row with the same STUDENT_ID due to different faculty DEPARTMENT values.
I want to read through the table and write out a single row for the STUDENT_ID and
concatonate the values for MAJORS_ACCOMPLISHED. The next row should be another STUDENT_ID and the MAJORS ACCOMPLISHED for that student..etc.
I've hit a wall trying to use cursors and WHILE loops to get the results I want. I'm hoping someone may have run across this before and have a suggestion. Tks!!

I think you are looking for string aggregation.
The following are the replies posted by me in the forum recently on the same case.
they might help you.
Re: Concatenating multiple rows in a table - Very urgent - pls help
Re: Doubt in a query ( Urgent )
Re: How to remove words which consist of max 2 letters?
Re: output like Name1,Name2,Name3...

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