Recall & Review
beginner
What is a relation in a database?
A relation is a table in a database that consists of rows and columns. Each row represents a record, and each column represents a field or attribute.
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beginner
Define a tuple in the context of a relation.
A tuple is a single row in a relation. It represents one record or data item with values for each attribute.
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beginner
What is an attribute in a relation?
An attribute is a column in a relation. It defines a property or characteristic of the data stored in the relation.
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intermediate
How do relations, tuples, and attributes relate to each other?
A relation is made up of attributes (columns) and tuples (rows). Attributes define the type of data, and tuples hold the actual data values.
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intermediate
Can a tuple have duplicate values in a relation?
No, each tuple in a relation must be unique. Duplicate tuples are not allowed to maintain data integrity.
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What does a tuple represent in a relation?
✗ Incorrect
A tuple is a single row in a relation representing one record.
Which of the following is an attribute in a relation?
✗ Incorrect
An attribute is a column that defines a property of the data.
What must be true about tuples in a relation?
✗ Incorrect
Tuples must be unique to avoid duplicate records.
A relation in a database is best described as:
✗ Incorrect
A relation is a table consisting of rows (tuples) and columns (attributes).
Which term refers to a column in a database table?
✗ Incorrect
An attribute is a column in a relation.
Explain the relationship between relations, tuples, and attributes in a database.
Think of a spreadsheet with rows and columns.
You got /5 concepts.
Why must tuples in a relation be unique? What could happen if duplicates exist?
Consider how duplicate rows affect searching for information.
You got /4 concepts.