ZuoTi.Pro
Question

If a 1:M relationship is optional on both sides, which of the following is true? The...

If a 1:M relationship is optional on both sides, which of the following is true?

The resulting foreign key can have null (empty) values

The resulting foreign key cannot have null (empty) values

The resulting foreign key must have null (empty) values

No foreign key is created as a result of mapping such a relationship
engineering   Computer-Science   
0 0
Add a comment Improve this question Transcribed image text
Next > < Previous
Sort answers by oldest

Homework Answers

Request Professional Answer

Request Answer!

We need at least 10 more requests to produce the answer.

0 / 10 have requested this problem solution

The more requests, the faster the answer.

Request! (Login Required)

All students who have requested the answer will be notified once they are available.
Know the answer?
Add Answer to:
If a 1:M relationship is optional on both sides, which of the following is true? The...
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Similar Homework Help Questions

  • Which of the following is NOT true? Mapping an M:N relationship that has no attributes will...

    Which of the following is NOT true? Mapping an M:N relationship that has no attributes will result in: A new relation Two foreign keys A composite primary key A foreign key in both of the relations mapped from the involved entities

  • QUESTION 6 Which of the following statements best illustrates the "Key" constraint? The schema MUST be...

    QUESTION 6 Which of the following statements best illustrates the "Key" constraint? The schema MUST be created before tables are added A primary key MUST NOT have duplicate values A foreign key value MUST have a value already present as a primary key in another table (or be NULL) A primary key value MUST have a value QUESTION 7 Which of the following statements best illustrates the "Referential Integrity" constraint? The schema MUST be created before tables are added A...

  • A. For a relationship to be defined, we need at least two relations (tables). [2] a....

    A. For a relationship to be defined, we need at least two relations (tables). [2] a. TRUE b. FALSE B. Aggregate functions can be used in a SELECT clause without GROUP BY on a column of a table [2] a. TRUE b. FALSE C. A table which satisfies 3NF (Third Normal Form) can violate 2NF (Second Normal Form) a. TRUE [2] b. FALSE D. In a table the foreign key attribute can have null value. a. TRUE [2] b. FALSE...

  • Which of the following describes referential integrity? A. A Primary Key of a relational table must...

    Which of the following describes referential integrity? A. A Primary Key of a relational table must not contain a null value B. One fact must not be in multiple places C. The value for a foreign key attribute must either be null or match the one of the data value of that attribute in the table in which the attribute is a primary key D. Referential Integrity is a principle that prevents the use of redundancy, avoids null values and...

  • Which of the following statements about a map in Java is incorrect? a map cannot contain...

    Which of the following statements about a map in Java is incorrect? a map cannot contain duplicate keys a map can contain a null value both key and value must be reference types a map cannot contain duplicate values

  • QUESTION 1 What is the most common relationship within a relational database? Select the best answer...

    QUESTION 1 What is the most common relationship within a relational database? Select the best answer from the following. One-To-One relationship. o One-To-Many relationship. Many-To-Many relationship. Zero-To-Zero relationship. QUESTION 2 What is an "entity'? Select the best answer from the following. An entity, for our purposes, is the same as a table in the database. An entity represents one of the columns in an individual table. There are no entities in a relational database. Entities are only part of NoSQL...

  • Please answer the true false questions 20) Analytical databases collect and present operational information in support...

    Please answer the true false questions 20) Analytical databases collect and present operational information in support of daily operational procedures and processes. 21) Analytical information is based on operational information. 22) Each instance of a weak entity must participate in one instance of the identifying relationship. 23) A weak entity that has a 1:1 identifying relationship with its owner, must have a partial key. 24) Each instance of a weak entity must participate in one instance of the identifying relationship....

  • Match the following words and explanations Domain Integrity Entity integrity Referential Integrity Explanations: A: All values...

    Match the following words and explanations Domain Integrity Entity integrity Referential Integrity Explanations: A: All values in a single column belong to the same scope of meaning B: Each primary key value must have a matching value in the Foreign Key C: The table has a primary key, which may be NULL D: Each Foreign Key value must have a matching value in the Primary key E: The table has a Primary key, which is never NULL

  • QUESTION 6 Which of the following is true about the relationship between stress and vitamins? a....

    QUESTION 6 Which of the following is true about the relationship between stress and vitamins? a. vitamins become toxic when we are under stress b. the stress response may deplete our bodies of certain vitamins c. a relationship between stress and vitamins has not been established d. A and B are both correct                                 A                                 B                                 C                                 D QUESTION 7 "going with the flow", accepting what you cannot change, and learning to be flexible is an example...

  • 1. Both Lagrange's theorem and Cauchy's theorem deal with the relationship between the size of a ...

    1. Both Lagrange's theorem and Cauchy's theorem deal with the relationship between the size of a group and the order of its elements. (a) Explain the difference between the theorems in general terms and by using S7 as an example. Your explanation should include what we can and cannot conclude from each theorem about S7 (b) Which theorem would allow you to prove that if a group contained only elements that had order some power of 2, then the order...

ADVERTISEMENT
Free Homework Help App
Download From Google Play
Scan Your Homework
to Get Instant Free Answers
Need Online Homework Help?
Ask a Question
Get Answers For Free
Most questions answered within 3 hours.
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT