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DBMS 1NF

DBMS 1NF with DBMS Overview, DBMS vs Files System, DBMS Architecture, Three schema Architecture, DBMS Language, DBMS Keys, DBMS Generalization, DBMS Specialization, Relational Model concept, SQL Introduction, Advantage of SQL, DBMS Normalization, Functional Dependency, DBMS Schedule, Concurrency Control etc.

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First Normal Form (1NF)

  • A relation will be 1NF if it contains an atomic value.
  • It states that an attribute of a table cannot hold multiple values. It must hold only single-valued attribute.
  • First normal form disallows the multi-valued attribute, composite attribute, and their combinations.

Example: Relation EMPLOYEE is not in 1NF because of multi-valued attribute EMP_PHONE.

EMPLOYEE table:

EMP_ID EMP_NAME EMP_PHONE EMP_STATE
14 John 7272826385,
9064738238		 UP
20 Harry 8574783832 Bihar
12 Sam 7390372389,
8589830302		 Punjab

The decomposition of the EMPLOYEE table into 1NF has been shown below:

EMP_ID EMP_NAME EMP_PHONE EMP_STATE
14 John 7272826385 UP
14 John 9064738238 UP
20 Harry 8574783832 Bihar
12 Sam 7390372389 Punjab
12 Sam 8589830302 Punjab

Next TopicDBMS 2NF




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