SQL Data Types Explained | Primary Key, Foreign Key & Constraints (SQL Tutorial #2)
Learn SQL data types, primary keys, foreign keys, and constraints in this beginner-friendly SQL tutorial.
This is Part 2 of the SQL series, where we dive deeper into database design fundamentals used in real-world data analysis and database management systems.
In this video, you’ll understand how SQL data types work, why primary keys and foreign keys are critical, and how constraints help maintain data integrity in relational databases.
📌 What You’ll Learn
SQL data types (INT, VARCHAR, DATE, FLOAT, etc.)
What is a Primary Key in SQL
What is a Foreign Key in SQL
SQL constraints (NOT NULL, UNIQUE, CHECK, DEFAULT)
How relationships work in relational databases
Best practices for database design
SQL concepts used by data analysts & BI professionals
This SQL for beginners tutorial is perfect if you are:
Learning SQL step by step
Preparing for data analyst or SQL interviews
Transitioning from Excel to SQL
Studying database fundamentals
Building strong SQL foundations
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