CANDIDATE KEY RETRIEVING APPARATUS, CANDIDATE KEY RETRIEVING METHOD AND TANGIBLE MACHINE-READABLE MEDIUM THEREOF

摘要

A candidate key retrieving apparatus, a candidate key retrieving method and a tangible machine-readable medium thereof are provided. The candidate key retrieving apparatus comprises a storage unit and a microprocessor. The storage unit is configured to store a table recording a data amount of the table, a plurality of attributes, and a data distinct amount and a data type of each attribute. The microprocessor is configured to generate a candidate key according to the data amount, the distinct amounts and the data types.