To enforce referential integrity, the database can return an error instead of doing the requested action or do the requested action and do the related changes to the related tables
Thus the answer is either a or b.
Explanation:
When the given data base in a table is valid and if it is consistent then it is called as referential integrity and it also refers to the consistency within the relationship. This type of database is much important because it will keep us introducing to the errors in the databases and it also checks if the reference from one table is equal to the other table.
The main function is to prevent the users from entering the wrong and inconsistent data. So in referential integrity the database will return the error instead of doing the required action or it can do the related changes to the related tables.
in 589, the Sui dynasty restored native rule to northern China and reunified the ... recovery under the Northern Wei that was even greater than the prosperous ...
Explanation: In 20th century, new instructional media appear for the first time and it fits in the context of school museums. It should be noted that the instruction media didn't fits in the contexts of Classrooms in K-12 schools, Science classes and In higher education institutes.
