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MASTER SQL KEYS in 30 Minutes (Primary, Foreign, UNIQUE, NOT NULL, DEFAULT)
Struggling with Primary Key vs Foreign Key vs UNIQUE vs NOT NULL vs DEFAULT in SQL? In this Episode 2, we build a complete mental model of SQL Keys & Constraints in just 30 minutes using real‑time examples, DDL, DML, and ERROR demos. 🔥 What you’ll learn in this video: What is a Primary Key and how it prevents duplicates What is a Foreign ...
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