PLEASE SOMEONE EXPLAIN ME THAT WHY 2ND OPTION IS TRUE ? I AM NOT GETTING THIS OPTION HELP ME
R(A,B,C,D) is a relation. Which of the following does not have a lossless join, dependency preserving BCNF decomposition?
- A→B,B→CD
- A→B,B→C,C→D
- AB→C,C→AD
- A→BCD