Question:
Which of the following statements about a relation \( R \) in first normal form (1NF) is/are TRUE?
Which of the following statements about a relation \( R \) in first normal form (1NF) is/are TRUE?
Show Hint
In 1NF, atomicity of attributes is essential. Composite attributes are not allowed, but multi-attribute keys and foreign keys are permitted.
Updated On: Jan 22, 2025
- \( R \) can have a multi-attribute key
- \( R \) cannot have a foreign key
- \( R \) cannot have a composite attribute
- \( R \) cannot have more than one candidate key
Hide Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Step 1: Analyze the statements.
1. \( R \) can have a multi-attribute key: Multi-attribute keys are allowed in 1NF as long as the attributes are atomic. This statement is true.
2. \( R \) cannot have a foreign key: This statement is false. Foreign keys are allowed in 1NF as they maintain referential integrity.
3. \( R \) cannot have a composite attribute: In 1NF, attributes must store atomic values, so composite attributes are not allowed. This statement is true.
4. \( R \) cannot have more than one candidate key: A relation in 1NF can have multiple candidate keys. This statement is false. Final Answer: \[ \boxed{\text{(1) and (3)}} \]
1. \( R \) can have a multi-attribute key: Multi-attribute keys are allowed in 1NF as long as the attributes are atomic. This statement is true.
2. \( R \) cannot have a foreign key: This statement is false. Foreign keys are allowed in 1NF as they maintain referential integrity.
3. \( R \) cannot have a composite attribute: In 1NF, attributes must store atomic values, so composite attributes are not allowed. This statement is true.
4. \( R \) cannot have more than one candidate key: A relation in 1NF can have multiple candidate keys. This statement is false. Final Answer: \[ \boxed{\text{(1) and (3)}} \]
Was this answer helpful?
0
0
Top Questions on Time and Work
- Sam can complete a job in 20 days when working alone. Mohit is twice as fast as Sam and thrice as fast as Ayana in the same job. They undertake a job with an arrangement where Sam and Mohit work together on the first day, Sam and Ayana on the second day, Mohit and Ayana on the third day, and this three-day pattern is repeated till the work gets completed. Then, the fraction of total work done by Sam is
- CAT - 2024
- Quantitative Aptitude
- Time and Work
- 3 men and 18 women together take 2 days to complete a piece of work.How many days will 9 women alone take to complete the piece of work,if 6 men alone can complete the piece of work in 3 days?
- Given below are two statements:
Statement I: Ram and Shyam can finish a task by working together in 6 days. If Shyam can finish the task by working alone in 8 days, then Ram alone will take 24 days to finish it.
Statement II: If 6 persons working 8 hours a day earn 8,400 per week, then 9 person working 6 hours a day will eam 9,450 per week.
In the light of the above statements, choose the correct answer from the options given below: - Two alarm clocks ring their alarms at regular intervals of 20 minutes and 25 minutes respectively. If they first beep together at 12 noon, at what time will they beep again together next time?
- CBSE Class X - 2024
- Mathematics
- Time and Work
- Two pipes A and B can fill a tank in 32 minutes and 48 minutes respectively. If both the pipes are opened simultaneously, after how much time B should be turned off so that the tank is full in 20 minutes?
- CUET (UG) - 2024
- Mathematics
- Time and Work
View More Questions
Questions Asked in GATE CS exam
- Consider the following C function definition: \begin{verbatim} int f(int x, int y) { for (int i = 0; i<y; i++) { x = x + x + y; } return x; } \end{verbatim} Which of the following statements is/are TRUE about the above function?
- GATE CS - 2024
- Miscellaneous
- Let \( A \) be any \( n \times m \) matrix, where \( m>n \). Which of the following statements is/are TRUE about the system of linear equations \( Ax = 0 \)?
- GATE CS - 2024
- Miscellaneous
- Consider the 5-state DFA \( M \) accepting the language \( L(M) \subseteq (0+1)^* \) shown below. For any string \( w \in (0+1)^* \), let \( n_0(w) \) be the number of \( 0 \)'s in \( w \) and \( n_1(w) \) be the number of \( 1 \)'s in \( w \). \begin{center} \includegraphics[width = 6cm]{50.png} \end{center} Which of the following statements is/are FALSE?
- GATE CS - 2024
- Miscellaneous
- Consider a binary min-heap containing 105 distinct elements. Let \( k \) be the index (in the underlying array) of the maximum element stored in the heap. The number of possible values of \( k \) is:
- GATE CS - 2024
- Miscellaneous
- Consider the following read-write schedule \( S \) over three transactions \( T_1, T_2, \text{and } T_3 \), where the subscripts in the schedule indicate transaction IDs: \[ S: r_1(z); w_1(z); r_2(x); r_3(y); w_3(y); r_2(y); w_2(x); w_2(y); \]
Which of the following transaction schedules is/are conflict equivalent to \( S \)?- GATE CS - 2024
- Miscellaneous
View More Questions