Skip to main content

Update Anomalies

An Update Anomaly exists when one or more instances of duplicated data is updated, but not all. For example, consider Jones moving address - you need to update all instances of Jones's address.

StudentNum CourseNum Student Name Address Course
S21 9201 Jones Edinburgh Accounts
S21 9267 Jones Edinburgh Accounts
S24 9267 Smith Glasgow physics
S30 9201 Richards Manchester Computing
S30 9322 Richards Manchester Maths


Next: Delete Anomalies