Consider the universal relation R= {A,B,C,D,E,F,G,H,I,J} and a set of functional dependencies F= { {AB→ C}, { A → DE}, { B→ F}, {F→ GH}, {D→ IJ}}. What is the key for R? Decompose R into 2NF, then 3NF relations.

Why ‘Data Redundancy’ is higher in 1st Normal Form than other normal forms? Explain with example.