## Discussion Forum

Que. | If a relation with a Schema R is decomposed into two relations R1 and R2 such that (R1 ∪ R2) = R1 then which one of the following is to be satisfied for a lossless joint decomposition (---> indicates functional dependency) |

a. | (R1 ∩ R2) --> R1 or R1 ∩ R2 ---> R2 |

b. | R1 ∩ R2 --> R1 |

c. | R1∩ R2 --> R2 |

d. | R1 ∩ R2 --> R1 and R1 ∩ R2 --> R2 |

Answer:(R1 ∩ R2) --> R1 or R1 ∩ R2 ---> R2 |