Exam-style question
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What is the main purpose of a primary key?.
- A.To identify each record uniquely within a table
- B.To ensure that every record has the same value
- C.To store several tables inside one attribute
- D.To prevent a table from containing any attributes
Model answer
What a good answer should say
- To identify each record uniquely within a table
Explanation
Why this works
A primary key provides a unique identifier for each record in its table.
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