SQL Constraints Explained with Examples

Описание: Master SQL Constraints with clear examples in under a minute! 🚀

We’ll cover:
✔ NOT NULL – prevents empty values
✔ UNIQUE – no duplicates allowed
✔ PRIMARY KEY – unique + not null
✔ FOREIGN KEY – connects tables
✔ CHECK – ensures conditions
✔ DEFAULT – assigns default values

These are the foundation of data integrity in SQL databases.

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