Можете да използвате:
SELECT LISTAGG('''' || student_name || '''',',')
WITHIN GROUP (ORDER BY student_name)
FROM students;
или използвайки ENQUOTE_LITERAL
функция:
SELECT LISTAGG(DBMS_ASSERT.ENQUOTE_LITERAL(student_name),',')
WITHIN GROUP (ORDER BY student_name) AS r
FROM students;