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The Importance of Primary and Foreign Keys in SQL Databases
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What is the difference between an index, a secondary key, and a unique key? - Quora
Types of Keys in Relational Model ✍️ | by Bhagya Chathumini | Medium
Relational model of the database.: Each box represents one table. One... | Download Scientific Diagram
What is a foreign key? (with SQL examples)
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Alternate Key in SQL | How to Use Alternate Key in SQL?
Key Attributes in ER Diagrams - DataScienceCentral.com
