Understanding Primary Keys and Foreign Keys is essential if you want to master SQL and Data Analytics. These concepts help maintain data integrity and relationships between database tables.
📌 What You’ll Learn
🔹 What is a Primary Key in SQL?
• A Primary Key uniquely identifies each record in a table.
• It must always be unique and cannot contain NULL values.
🔹 What is a Foreign Key in SQL?
• A Foreign Key connects two tables in a database.
• It references the Primary Key from another table.
• This ensures referential integrity between related data.
🔹 Primary Key vs Foreign Key – Key Differences
• Primary Key identifies a unique record in a table.
• Foreign Key creates a relationship between tables.
• Primary Keys cannot have NULL values, while Foreign Keys can sometimes allow them.
🔹 Real-Life Example: Student & Course Database
In a Students table, Student_ID acts as a Primary Key.
In a Courses table, Student_ID can be a Foreign Key linking courses to the correct student.
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📚 Recommended Books for SQL Learners
• Learning SQL – Alan Beaulieu
• SQL in 10 Minutes – Ben Forta
• Database System Concepts – Silberschatz
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