Relationships in DBMS
Presentation
•
Computers
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10th Grade
•
Medium
Lhun Dra
Used 5+ times
FREE Resource
7 Slides • 21 Questions
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2
Multiple Choice
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A relationship defines how data in one table connects to data in another.
Primary Keys (PK) and Foreign Keys (FK) are used to establish these connections.
Types of Relationships:
• One-to-One
• One-to-Many
• Many-to-Many
4
Multiple Choice
What are the types of relationships in a database?
One-to-One
One-to-Many
Many-to-Many
All of the above
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Multiple Choice
What do you mean by one to many relationships?
One class may have many teachers
One teacher can have many classes
Many classes may have many teachers
Many teachers may have many classes
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Multiple Choice
What is a one-to-one (1:1) relationship in database terms?
Each record in Table A is linked to multiple records in Table B
Each record in Table A is linked to only one record in Table B
Each record in Table A is linked to no records in Table B
Each record in Table A is linked to some records in Table B
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Definition: One record in Table A can relate to many records in Table B, but each record in B relates to only one record in A.
Example:
• One Student ↔ Many Issue Records Table Example: Students(StudentID, Name) IssueRecords(IssueID, StudentID, BookID) Use Case: Most common relationship in databases.
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Multiple Choice
What is the definition of a One-to-Many relationship in database management?
One record in Table A relates to many records in Table B
One record in Table A relates to one record in Table B
Many records in Table A relate to one record in Table B
One record in Table A relates to no records in Table B
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Multiple Choice
What is the definition of a Many-to-Many relationship in databases?
A relationship where one record in Table A relates to one record in Table B
A relationship where many records in Table A can relate to many records in Table B
A relationship where one record in Table A can relate to many records in Table B
A relationship where many records in Table A relate to one record in Table B
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Multiple Choice
Which type of relationship in Dataverse allows multiple records from one table to be related to multiple records in another table?
One to One
One to Many
Many to One
Many to Many
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Multiple Choice
What are the benefits of establishing relationships in databases?
Avoid data redundancy
Ensure data consistency
Enable efficient data retrieval
All of the above
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Multiple Choice
What does the notation 1:∞ or 1:n represent in a relationship diagram?
One student has one card
One student can borrow many books
Many students can borrow many books
One student has many cards
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Multiple Choice
A primary key can be NULL in the table? TRUE or FALSE
TRUE
FALSE
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Multiple Choice
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Multiple Choice
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Multiple Choice
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Multiple Choice
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Multiple Choice
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Multiple Choice
What is a Relationship in an Database?
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Multiple Choice
What is a primary key?
A field
A record
Two fields
A unique reference
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Multiple Choice
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Multiple Choice
What do you mean by one to many relationships?
One class may have many teachers
One teacher can have many classes
Many classes may have many teachers
Many teachers may have many classes
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Multiple Choice
Which type of relationship should be used to connect a Password table to a User Account table?
One-to-One relationship
One-to-many relationship
One-to-one relationship
Many-to-many relationship
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Multiple Choice
What is a foreign key in a database?
A key that uniquely identifies a record in a table
A key that is used to link two tables together
A key that allows duplicate records
A key that stores large amounts of text
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