Explain the key concepts that are involved in supporting data integrity in a database. How is integrity enforced? What are the advantages of enforcing integrity? What are the disadvantages? How do integrity constraints impact the overall application design?© BrainMass Inc. brainmass.com December 24, 2021, 5:03 pm ad1c9bdddf
Explain the key concepts that are involved in supporting data integrity in a database.
Data integrity is one of the cornerstone of any relational databases. Simply state, data integrity means that the data values in the database must be correct and consistent.
"Normalization" is a model used to avoid redundancy ... don't put the same information in more than one place!
Keys: Keys are used to index (or sort) tables and to reference information in other tables.
A primary key requires unique data in that specific field and is sorted in the current table; it can be used as a foreign key reference from another table. A foreign key references data in a different table. A composite key consists of more than one field.
Data relationships: Data file relationships are generally recognized as "1:1"; "1:many"; or "many:many".
How is integrity enforced?
Data integrity is enforced by means of "entity" and "referential" integrity rules. Although not part of the relational model, most database software enforce ...
Data integrity is examined.