DELETE or empty field containing the BLOB in the roacle table

Hi all.

I have a table in the schema with a BLOB field. I store the photo of the employee in this area. Fields of this table are emp_name emp_id (number) (varchar2) and emp_photo (BLOB). I would like to ask if there is a way in pl / sql I could empty this field to null BLOB or reset this field so that the user can modify the saved photo graph and record another.

I'm looking for is something like
      alter table employee set emp_photo = empty_blob() or alter table employee set emp_photo = null

  
Thanks in advance.

>
I'm looking for
>
Looking in the documentation for Oracle? For example, in the EMPTY_BLOB, EMPTY_CLOB of the SQL language reference section?
http://docs.Oracle.com/CD/B28359_01/server.111/b28286/functions049.htm
>
Goal
EMPTY_BLOB and EMPTY_CLOB return an empty LOB Locator that can be used to initialize an LOB variable or in an INSERT or UPDATE statement to initialize a LOB column or attribute EMPTY. EMPTY means that the LOB is initialized, but not filled with data.
. . .
Examples

The following example initializes the ad_photo of the sample pm.print_media EMPTY table column:
UPDATE print_media SET ad_photo = EMPTY_BLOB();

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