Question
Which of the following correctly describes the second
normal form (2NF) in database normalization?Solution
A table is in Second Normal Form (2NF) if it is in First Normal Form (1NF) and all non-key attributes are fully functionally dependent on the entire primary key, not just part of it. This eliminates partial dependencies, which occur when a non-key attribute depends on only a part of a composite primary key. Why Other Options Are Incorrect:
- The table contains no duplicate rows: This is a general requirement for any relational database, not specific to 2NF.
- Every determinant is a candidate key: This describes Boyce-Codd Normal Form (BCNF) , a stricter form of 3NF.
- The table is free from transitive dependency: This is achieved in Third Normal Form (3NF) , not 2NF.
- All attributes depend on the primary key: This defines 1NF but does not address partial dependencies, a key focus of 2NF.
129, 224, 355, 528, ?, 1024
What will come in the place of questions (?) mark in the following questions.
40, 25, 30, 50, 105, ?
25, 30, 50, 60, 80, ?Â
What will come in place of the question mark (?) in the following series?
22, 25, 30, 37, 48, ?
1, 7, 25, 61, ?
{(12√5 + 6√5 )} ×{(10√5 - 5√5 )} - 8² + 6² = ?
69, 35.5, 39.5, 68.25, 152.5, ?
632, 625, 611, 590, 562, ?
If series II follows the same sequence pattern as series I shown below, determine the value of 'p'.
Series I: 40, 25, 30, 50, 105, 267.5
<...17 , 37 , 79 , 165 , ? , 689
