Does a Primary Key Prevent Duplicate Records in Databases?

Learn how a primary key enforces uniqueness and prevents duplicate records in database tables, ensuring data integrity.

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Yes, a primary key prevents duplicates. In database management, a primary key is a unique identifier for a record in a table. By design, it ensures that each record is unique, which means duplicates are automatically prevented. When a field is set as a primary key, the database will not allow any duplicate values in that field, maintaining data integrity and accuracy.

FAQs & Answers

  1. What is a primary key in a database? A primary key is a unique identifier for each record in a database table, ensuring no duplicate values exist in that field.
  2. How does a primary key prevent duplicates? A primary key prevents duplicates by enforcing uniqueness in the database field assigned as the primary key, so duplicate entries are not allowed.
  3. Can a database table have multiple primary keys? No, a database table can have only one primary key, which may consist of a single column or a combination of columns (composite key).

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