A unique constraint is a database rule that ensures all values in a column or a set of columns are distinct across the rows, preventing duplicate entries. It is crucial for maintaining data integrity and is often used to enforce the uniqueness of identifiers like primary keys or any other candidate keys.

Unique Constraint

unique constraint

database rule

values in a column

set of columns

distinct across the rows

duplicate entries

Data integrity refers to the accuracy, consistency, and reliability of data throughout its lifecycle, ensuring that it remains unaltered and trustworthy for decision-making and analysis. It is crucial for maintaining the credibility of databases and information systems, and involves various practices and technologies to prevent unauthorized access or corruption.

data integrity

uniqueness of identifiers

primary keys

candidate keys

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