When a relation is not in appropriate normal form then the decomposition of a relation is required. It breaks the table into multiple tables. If the relation has no proper decomposition, then it may lead to loss of information. Eliminate some of the problems like anomalies, inconsistencies, and redundancy.
This is part of the FIRO-B series. I have included a PPT, The Questionnaire, The Scoring Sheet and the Scoring Guide. Please note the points related to ethical use of FIRO B through online research. Use as appropriate.
This is part of the FIRO-B series. I have included a PPT, The Questionnaire, The Scoring Sheet and the Scoring Guide. Please note the points related to ethical use of FIRO B through online research. Use as appropriate.
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Ever thought that having half a piece of chocolate will have mathematics in it?
Well we deal with fractions in our day to day life without realizing its significance. So, let's learn all about "Fractions" in this session.
We have covered following subtopics here:
1. What are Fractions ?
2. Decimal fractions
3. Proper & Improper fractions
4. Mixed fractions
Cyber security refers to the body of technologies, processes, and practices designed to protect networks, devices, programs, and data from attack, damage, or unauthorized access. Cyber security may also be referred to as information technology security.
Also known as stepwise-refinement or decomposition, this approach takes the whole software system as one entity and decomposes it to achieve more than one subsystem based on some characteristics.
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2. What is Decomposition?
1. When a relation is not in appropriate normal form then the
decomposition of a relation is required.
2. It breaks the table into multiple tables.
3. If the relation has no proper decomposition, then it may
lead to loss of information.
4. Eliminate some of the problems like anomalies,
inconsistencies, and redundancy.
4. Dependency Preserving Decomposition
1. At least one decomposed table must satisfy every
dependency.
2. If a relation R is decomposed into relation R1 and R2, then
the dependencies of R must be a part of R1 or R2 or must
be derivable from the combination of functional
dependencies of R1 and R2.
3. That means, F1∪F2 ≡ F
5. Lossless Decomposition
1. If the information is not lost from the relation that is
decomposed, then the decomposition will be lossless.
2. The lossless decomposition guarantees that the join of
relations will result in the same relation as it was
decomposed.
3. The relation is said to be lossless decomposition if natural
joins of all the decomposition give the original relation.