Database-Management-System

In table Tl, P is the primary key, Q is the foreign key referencing R in table T2

with on-delete cascade and on-update cascade. In table T2, R is the primary key
and S is the foreign key referencing P in the table Tl with on-delete set NULL and
on-update cascade. In order to delete record (3,8) from table, number of additional
records that need to be deleted from table T1 is