Types of Constraints. #GitHub , #Index, #Primary Key, #Foreign Key, #Relationship, #Schema, #charts

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🔹 Types of Constraints in DBMS
✅ 1. NOT NULL Constraint

Ensures that a column cannot have NULL empty values.
👉 Every record must have a value for Name.

✅ 2. UNIQUE Constraint

Ensures that all values in a column are different (no duplicates).
👉 No two users can have the same email.

✅ 3. PRIMARY KEY Constraint

A combination of:

NOT NULL

UNIQUE

Used to uniquely identify each record.

Example:

ID INT PRIMARY KEY

👉 Only one primary key per table.

✅ 4. FOREIGN KEY Constraint

Creates a link between two tables.

👉 Ensures referential integrity

👉 CustomerID must exist in the parent table.

✅ 5. CHECK Constraint

Ensures that values satisfy a specific condition.
👉 Only allows values ≥ 18.

✅ 6. DEFAULT Constraint

Provides a default value if none is specified.
👉 If no value is given, "Active" is inserted.

✅ 7. INDEX Constraint (Not strictly a constraint but related)

Used to improve query performance, not enforce rules.

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