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A table has fields Fl, F2, F3, F4, F5 with the following functional dependencies F1 → F3 F2→ F4 (F1 . F2) → F5 In terms of Normalization, this table is in
- a)1 NF
- b)2 NF
- c)3 NF
- d)none
Correct answer is option 'A'. Can you explain this answer?
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A table has fields Fl, F2, F3, F4, F5 with the following functional de...
First Normal Form A relation is in first normal form if every attribute in that relation is singled valued attribute. Second Normal Form A relation is in 2NF iff it has No Partial Dependency, i.e., no non-prime attribute (attributes which are not part of any candidate key) is dependent on any proper subset of any candidate key of the table. This table has Partial Dependency f1->f3, f2-> f4 given (F1,F2) is Key So answer is A
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A table has fields Fl, F2, F3, F4, F5 with the following functional de...
Explanation:
Normalization is a process of organizing data in a database to reduce redundancy and dependency. It is divided into multiple normal forms, i.e., 1NF, 2NF, 3NF, BCNF, etc. Each normal form has its specific rules, which helps in reducing data redundancy and dependency.
Given the functional dependencies:
F1 → F3
F2 → F4
F1, F2 → F5
The table has fields Fl, F2, F3, F4, F5. Let's check the table's normalization form based on the given functional dependencies.
1NF (First Normal Form):
A table is in 1NF if it has a primary key and atomic values in each column. In this table, all the columns have atomic values, and no column is dependent on any other column. Hence, the table is in 1NF.
2NF (Second Normal Form):
A table is in 2NF if it is in 1NF and all non-key columns are dependent on the primary key. Here, F1 is the primary key, and F2 is dependent on it. F3 is also dependent on F1, while F4 is dependent on F2. F5 is dependent on F1 and F2 together. Hence, the table is in 2NF.
3NF (Third Normal Form):
A table is in 3NF if it is in 2NF and has no transitive dependencies. Here, we do not have any transitive dependency in the table, so the table is in 3NF.
Hence, the correct answer is option A, i.e., the table is in 1NF.
Normalization is a process of organizing data in a database to reduce redundancy and dependency. It is divided into multiple normal forms, i.e., 1NF, 2NF, 3NF, BCNF, etc. Each normal form has its specific rules, which helps in reducing data redundancy and dependency.
Given the functional dependencies:
F1 → F3
F2 → F4
F1, F2 → F5
The table has fields Fl, F2, F3, F4, F5. Let's check the table's normalization form based on the given functional dependencies.
1NF (First Normal Form):
A table is in 1NF if it has a primary key and atomic values in each column. In this table, all the columns have atomic values, and no column is dependent on any other column. Hence, the table is in 1NF.
2NF (Second Normal Form):
A table is in 2NF if it is in 1NF and all non-key columns are dependent on the primary key. Here, F1 is the primary key, and F2 is dependent on it. F3 is also dependent on F1, while F4 is dependent on F2. F5 is dependent on F1 and F2 together. Hence, the table is in 2NF.
3NF (Third Normal Form):
A table is in 3NF if it is in 2NF and has no transitive dependencies. Here, we do not have any transitive dependency in the table, so the table is in 3NF.
Hence, the correct answer is option A, i.e., the table is in 1NF.
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A table has fields Fl, F2, F3, F4, F5 with the following functional dependenciesF1 → F3 F2→ F4 (F1 . F2) → F5 In terms of Normalization, this table is ina)1 NFb)2 NFc)3 NFd)noneCorrect answer is option 'A'. Can you explain this answer?
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