Querying Db with huge data

[PAVB]

It looks to me like he has a table in an Oracle database and he wants to take an external file and query on the database table based on the external file. It seems to me that you want to create an external table in the database to point to your spreadsheet. Then when you query from the students table you can do this:

SELECT * 
  FROM students
 WHERE student_id IN
     ( SELECT student_id
         FROM student_spreadsheet )
 ORDER BY 1;

This is a very smart solution indeed.