6.5 First Normal Form in dbms With Example | 1NF in dbms | Normalization in Dbms | normal forms

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Relational Database Design Functional Dependencies And Normalization


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First Normal Form (1NF)
A relation is in first normal form if domain of each attribute contains only atomic values.
It means atomicity must be present in relation.
Consider the relation Employee as shown in Figure 6.8. It is not in first normal form
because attribute Name is not atomic. So, divide it into two attributes First Name and Last
Name

Now, relation Employee is in 1NF.
Anomalies in First Normal Form : First Normal form deals only with atomicity. Anomalies
described earlier are also applicable here.
Example. Given the relation PART (Part_ID, Descr, Price, Comp_ID, No) having the
following dependencies
Part_ID → Descr
Part_ID → Price
Part_ID, Comp_ID → No
Determine the highest normal form of this relation.
Sol. There exists multivalue attributes. The attributes Comp_ID and No are not determined by the primary key. Hence the relation is not in INF.

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