Register

in functional dependency armstrong inference rules refers to

• reopened by
1,277 views

1 Answer

0 0 votes

Armstrong axioms consist of the following three rules:

 1.  Reflexivity: If Y ⊆ X, then X → Y.

  2. Augmentation: If X → Y , then XZ → YZ.

 3. Transitivity: If X → Y and Y → Z, then X → Z0.

other three rules can be derived from this.

Voting & Accepting an answer helps improve the community
← Previous · ISRO CSE 2014 | Ques...Next → · warnier diagram enab...
← Previous in category · ISRO CSE 2011 | Ques...Next in category → · which raid level giv...
Position:
Show:

Related questions

0 0 votes
0 0 answers
717
717 views
anonymous asked Jul 4, 2016
717 views
navathe,FD #inference rules for functional dependency
0 0 votes
1 1 answer
1.4k
1.4k views
Isha Gupta asked Jun 12, 2016
1,369 views
Armstrong inference rule does not determine
Armstrong inference rule does not determinea. Reflexivityb. Augmentationc. Transitivityd. Mutual Dependency
0 0 votes
0 0 answers
362
362 views
Anuanu asked May 31, 2016
362 views
armstrong inference rule does not determine
2 2 votes
2 2 answers
9.7k
9.7k views
Durgesh Singh asked Oct 2, 2017
9,672 views
When does BCNF not able to preserve functional dependency?
I am trying to understand when does BCNF not able to preserve functional dependencyWhat is the proof that 3NF always preserve functional dependencySuppose I have a relati...