Data Redundancy
Explore data redundancy in SQL by identifying repeated information in tables and understanding attribute dependencies. Learn the challenges redundancy causes, such as storage overhead and data integrity issues, and how SQL foreign keys establish relationships between tables to reduce redundancy and maintain accurate data.
We'll cover the following...
We'll cover the following...
Identifying redundant data in the SalesData table
The layout of our updated SalesData table is as follows:
Let’s take another look at the stored data:
Do you notice anything peculiar? There might be several aspects, but let’s concentrate on one: redundant data. Is there any information needlessly repeated? ...