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What is the purpose of a primary key in a database table?
What is the purpose of a primary key in a database table?
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Practice Questions
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Q1
What is the purpose of a primary key in a database table?
To uniquely identify each record
To link tables together
To enforce data types
To store large amounts of data
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A primary key is used to uniquely identify each record in a database table.
Questions & Step-by-step Solutions
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Q: What is the purpose of a primary key in a database table?
Solution:
A primary key is used to uniquely identify each record in a database table.
Steps: 6
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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 different record or entry.
Step 3: A primary key is a special column in the table.
Step 4: The primary key contains unique values for each row, meaning no two rows can have the same value in this column.
Step 5: This uniqueness helps to easily find, update, or delete specific records in the table.
Step 6: Think of the primary key like a student ID number; each student has a different ID that identifies them.
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