20. The attribute B is the attribute A if each value in column A determines one and only one value in column B. a. logically dependent on b. owned by c. determined by d. functionally dependent on 21. Any attribute that is part of a key is known as a a. key attribute b. logical attribute c. key determiner d. selector 22. If the attribute (B) is functionally dependent on a composite key (A) but not on any subset of that key, the attribute (B) is fully functionally dependent on (A). a. foreign b. unique c. composite d. complete 23. No data entry at all is known as a(n) a. nil b. null c. empty d. zero 24. In the following table description. is the primary key PRODUCT (PROD_CODE, PROD DESCRIPT, PROD PRICE, PROD ON HAND, VEND_CODE) a. PROD DESCRIPT b. PROD_CODE c. PROD PRICE d. PROD_ON HAND A CUSTOMER table's primary key is CUS_CODE. The CUSTOMER primary key column has no null entries, and all entries are unique. This is an example of integrity a. entity b. referential 25. c. complete null