Explanation : As Q refers to R so, deleting 8 from Q won't be an issue, however, S refers P. But as the relationship given is on delete set NULL, 3 will be deleted from T1 and the entry in T2 having 3 in column S will be set to NULL. So, no additional records deleted from table T1
Explanation : Sign = 0
Here sign of AE is negative so take two's complement of AE = 00000011
Mantissa: Normal Mantissa = 1.M = 1.1101101
Data + 1.1101101 x 2-3
Hence answer is 2.27 x 10-1
Note: only M to N relationship needs exclusive table: If a relationship is 1 to M or M to 1 then that relation could be included in the many side table with the help of foreign key concept.