Introduction
Start with a brief introduction about keys in the Relational Model of DBMS. Mention the importance of keys in uniquely identifying a tuple (row) in a relation (table).
What is a Primary Key?
Explain what a Primary Key is. Discuss its role in uniquely identifying the tuples in a relation. Mention that it is a minimal super key and that any attribute of the Primary Key cannot contain a NULL value.
What is a Candidate Key?
Explain what a Candidate Key is. Discuss its role in uniquely identifying the tuples in a relation. Mention that there can be more than one Candidate Key in a relation and that a Candidate Key’s attributes can contain a NULL value.
Comparing Primary Key and Candidate Key
Discuss the differences between Primary Key and Candidate Key. Mention that every Primary Key is a Candidate Key, but not every Candidate Key is a Primary Key.
Practical Implications
Give examples of how to use Primary Key and Candidate Key in a database. You could show side-by-side comparisons of code using Primary Key and Candidate Key.
Conclusion
Wrap up the post by discussing the importance of understanding the difference between Primary Key and Candidate Key for anyone working with databases.
I hope this helps! You can expand on each section based on your personal experiences and understanding. Let me know if you need help with anything else. 😊
