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Rules that ensure data accuracy and consistency.
Ensures each table row has a unique identity.
Maintains consistency between related tables.
Validates data values within a specific range or type.
Ensure uniqueness and identification of records.
Primary key cannot be NULL; unique key can be NULL.
Referential integrity is violated.
Validates specific conditions for data entry.
Prevents NULL values in a specified column.
Provides a default value if none is specified.
Combination of columns used as a primary key.
Age must be between 18 and 30.
No duplicate values are allowed in the column.