1 votes 1 votes The rule that a value of a foreign key must appear as a value of some specific table is called a Referential constraint Index Integrity constraint Functional dependency Databases tbb-dbms-1 + – Bikram asked Nov 26, 2016 • edited Nov 19, 2018 by go_editor Bikram 281 views answer comment Share Follow See all 0 reply Please log in or register to add a comment.
Best answer 1 votes 1 votes The rule of referential integrity requires that every foreign-key value must appear as another table's primary key value. References: http://www.personal.kent.edu/~jtalbott/chapter_22/chapter_22.html https://www.w3resource.com/sql/creating-and-maintaining-tables/foreign-key.php http://iete-elan.ac.in/SolQP/AC14.htm The correct answer is $(A)$. Lakshman Bhaiya answered Aug 21, 2019 • selected Aug 21, 2019 by Bikram Lakshman Bhaiya comment Share Follow See all 0 reply Please log in or register to add a comment.