Description: The ‘NUMERIC UNIQUE’ is a type of constraint in databases that is applied to a numeric column, ensuring that all values in that column are unique. This means that there cannot be two rows in the table containing the same value in that specific column. This feature is fundamental for maintaining data integrity, as it allows for the unequivocal identification of each record. For example, in a user database, a ‘User ID’ field could be defined as unique numeric, ensuring that each user has a unique identifier. Unique constraints can be applied to one or more columns, and in the case of multiple columns, the combination of values in those columns must be unique. This property is essential in the design of relational databases, as it helps prevent data duplication and facilitates the search and retrieval of information. Additionally, using a unique numeric constraint can optimize query performance, as indexes can be created on these columns, improving data access speed. In summary, ‘NUMERIC UNIQUE’ is a key tool in database management that ensures the uniqueness and integrity of stored data.
