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What is a relation schema?
What is a relation schema?
A1, A2, …, An are attributes. R = (A1, A2, …, An ) is a relation schema.
Define a relation instance.
Define a relation instance.
A relation instance r defined over schema R is denoted by r (R).
What are attributes in the context of relational databases?
What are attributes in the context of relational databases?
Attributes are the columns in a relation that define the characteristics or properties of the data.
What is the domain of an attribute?
What is the domain of an attribute?
What is the special value 'null' in the context of relational databases?
What is the special value 'null' in the context of relational databases?
What is the structure of relational databases?
What is the structure of relational databases?
What is meant by 'relation schema'?
What is meant by 'relation schema'?
How are relation instances denoted?
How are relation instances denoted?
What are attributes in the context of relational databases?
What are attributes in the context of relational databases?
What is the domain of an attribute in relational databases?
What is the domain of an attribute in relational databases?
Which term refers to indivisible attribute values in relational databases?
Which term refers to indivisible attribute values in relational databases?
What is the special value 'null' in the context of relational databases?
What is the special value 'null' in the context of relational databases?
What does the domain of an attribute in relational databases refer to?
What does the domain of an attribute in relational databases refer to?
Which term is used to denote the current values of a relation specified by a table in relational databases?
Which term is used to denote the current values of a relation specified by a table in relational databases?
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