1. Define data dependency, and explain only two reasons why this is undesirable. Explain the solution...
1. Define data dependency, and explain only two reasons why this is undesirable. Explain the solution to this.
2. One of the advantages of a database management system is to provide data independence. Explain this.
Homework Answers
1. Data dependency means that one/more attribute uniquely identifies other attributes of a relation. in more simple terms we can say that some data values are dependent on other data values in order to get recognized.
This situation is not desirable because every non-key attribute has to be fully dependent on the PK.
2. One of the highest advantage of databases is data independence. It means we can change the conceptual schema at one level without affecting the data at another level. It also means we can change the structure of a database without affecting the data required by users and programs.
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