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What does a primary key do in an ER model?
What does a primary key do in an ER model?
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Practice Questions
1 question
Q1
What does a primary key do in an ER model?
Links two entities
Identifies a unique record
Defines a relationship type
Stores multiple values
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A primary key uniquely identifies a record in a database table.
Questions & Step-by-step Solutions
1 item
Q
Q: What does a primary key do in an ER model?
Solution:
A primary key uniquely identifies a record in a database table.
Steps: 5
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Step 1: Understand that a database table is like a spreadsheet with rows and columns.
Step 2: Each row in the table represents a unique record, like a single person or item.
Step 3: A primary key is a special column in the table that gives each row a unique identifier.
Step 4: This means no two rows can have the same value in the primary key column.
Step 5: The primary key helps us find, update, or delete a specific record easily.
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