Constraints (NOT NULL, UNIQUE, DEFAULT, PRIMARY KEY, CHECK) in SQL with examples | SQL Tutorial

• NOT NULL - Ensures that a column cannot have a NULL value

• UNIQUE - Ensures that all values in a column are different

PRIMARY KEY - A combination of a NOT NULL and UNIQUE. Uniquely identifies each row in a table

• CHECK - Ensures that all values in a column satisfies a specific condition

DEFAULT - Sets a default value for a column when no value is specified

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