Consider the following tables T1 and T2. In table T1, $\mathbf{P}$ is the primary key and $\mathbf{Q}$ is the foreign key referencing $\mathbf{R}$ in table T2 with on-delete cascade and on-update cascade. In table T2, $\mathbf{R}$ is the primary key and $\mathbf{S}$ is the foreign key referencing $\mathbf{P}$ in table T1 with on-delete set NULL and on-update cascade. In order to delete record $\langle 3, 8\rangle$ from table T1, the number of additional records that need to be deleted from table T1 is _________.

Let us trace the referential actions triggered by deleting record $\langle 3, 8 \rangle$ from table $T1$:

1. In $T1$, $P$ is the primary key. Deleting record $\langle 3, 8 \rangle$ means deleting the tuple with $P = 3$.

2. Table $T2$ has a foreign key $S$ referencing $P$ in $T1$ with ON DELETE SET NULL.

3. Looking at table $T2$, the tuple referencing $P = 3$ is $\langle 8, 3 \rangle$ (where $R = 8, S = 3$).

4. Due to ON DELETE SET NULL, the value of $S$ in record $\langle 8, 3 \rangle$ of $T2$ is updated to NULL (it becomes $\langle 8, \text{NULL} \rangle$). No tuple is deleted from $T2$.

5. Since no tuples are deleted from $T2$, no cascading delete back to table $T1$ is triggered.

Therefore, no additional records need to be deleted from table $T1$. The number of additional records deleted is 0.