PHP Code:
$query = "SELECT * FROM `Student`"; 
Thats fine, but i need to extend it.

The Students table has a field called 'Student_ID'
The Persons table has a field called 'Student_ID' (foreign key etc)

I want to select all the entries from the 'Student' table where the 'Student_ID' is not in the 'Persons' table

any help guys?