Computer Science Engineering (CSE) Exam > Computer Science Engineering (CSE) Questions > Given the basic ER and relational models, whi...
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Given the basic ER and relational models, which of the following is INCORRECT?
- a)An attribute of an entity can have more than one value
- b)An attribute of an entity can be composite
- c)In a row of a relational table, an attribute can have more than one value
- d)In a row of a relational table, an attribute can have exactly one value or a NULL value
Correct answer is option 'C'. Can you explain this answer?
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Verified Answer
Given the basic ER and relational models, which of the following is IN...
The term ‘entity’ belongs to ER model and the term ‘relational table’ belongs to relational model. A and B both are true. ER model supports both multivalued and composite attributes See this for more details. (C) is false and (D) is true. In Relation model, an entry in relational table can can have exactly one value or a NULL.
Most Upvoted Answer
Given the basic ER and relational models, which of the following is IN...
Explanation:
A relational database is a collection of related tables, and each table consists of rows and columns. The columns in a table represent attributes, while the rows represent instances or entities. The basic ER (Entity-Relationship) model is used to represent the entities, relationships, and attributes in a database.
Attributes in the ER Model:
- An attribute represents a characteristic or property of an entity.
- An attribute can have a single value or multiple values.
- An attribute can be composite, meaning it can be composed of multiple sub-attributes.
Relational Model:
- In the relational model, attributes are represented as columns in a table.
- Each row represents an instance or entity, and each cell in the table represents a value for a specific attribute of that entity.
Incorrect Statement:
The statement "In a row of a relational table, an attribute can have more than one value" is incorrect. In the relational model, each attribute in a row can have only one value or a NULL value.
Correct Statements:
a) An attribute of an entity can have more than one value:
- This is correct. For example, an entity "Person" may have multiple phone numbers, so the "Phone Number" attribute can have multiple values.
b) An attribute of an entity can be composite:
- This is correct. A composite attribute is an attribute that can be divided into sub-attributes. For example, an attribute "Address" can be composed of sub-attributes like "Street," "City," and "Zip Code."
d) In a row of a relational table, an attribute can have exactly one value or a NULL value:
- This is correct. In the relational model, each attribute in a row can have a single value or a NULL value. NULL represents the absence of a value or unknown value for that attribute.
Conclusion:
The incorrect statement is option C, which states that in a row of a relational table, an attribute can have more than one value. In reality, each attribute in a row of a relational table can have only one value or a NULL value.
A relational database is a collection of related tables, and each table consists of rows and columns. The columns in a table represent attributes, while the rows represent instances or entities. The basic ER (Entity-Relationship) model is used to represent the entities, relationships, and attributes in a database.
Attributes in the ER Model:
- An attribute represents a characteristic or property of an entity.
- An attribute can have a single value or multiple values.
- An attribute can be composite, meaning it can be composed of multiple sub-attributes.
Relational Model:
- In the relational model, attributes are represented as columns in a table.
- Each row represents an instance or entity, and each cell in the table represents a value for a specific attribute of that entity.
Incorrect Statement:
The statement "In a row of a relational table, an attribute can have more than one value" is incorrect. In the relational model, each attribute in a row can have only one value or a NULL value.
Correct Statements:
a) An attribute of an entity can have more than one value:
- This is correct. For example, an entity "Person" may have multiple phone numbers, so the "Phone Number" attribute can have multiple values.
b) An attribute of an entity can be composite:
- This is correct. A composite attribute is an attribute that can be divided into sub-attributes. For example, an attribute "Address" can be composed of sub-attributes like "Street," "City," and "Zip Code."
d) In a row of a relational table, an attribute can have exactly one value or a NULL value:
- This is correct. In the relational model, each attribute in a row can have a single value or a NULL value. NULL represents the absence of a value or unknown value for that attribute.
Conclusion:
The incorrect statement is option C, which states that in a row of a relational table, an attribute can have more than one value. In reality, each attribute in a row of a relational table can have only one value or a NULL value.
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Given the basic ER and relational models, which of the following is INCORRECT?a)An attribute of an entity can have more than one valueb)An attribute of an entity can be compositec)In a row of a relational table, an attribute can have more than one valued)In a row of a relational table, an attribute can have exactly one value or a NULL valueCorrect answer is option 'C'. Can you explain this answer?
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