Question

A relation is decomposed into R1(A,

  • B and R2(B,
  • C . Which condition guarantees a lossless join for a binary decomposition?
A B must be a foreign key in both relations
B C→B in R2 only
C B→A in R1 or B→C in R2
D A→B in R1 only
E A→C in the original relation
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