NORMALIZATION

QUESTION:

Do a normalization based on the figure 5.1, starting with unnormalized form until the third normal form as follows:

UNF – Contain repeating group.

1NF - Remove repeating group

2NF – Remove partial dependencies

3NF - Remove transitive dependencies

ANSWER:

UNFPROJECTEMP (PROJ_NUM, PROJ_NAME, (EMP_NUM, EMP_NAME,

JOBCLASS, CHG_HOUR, HOURS))

1NF - Remove repeating groupPROJECT (PROJ_NUM, PROJ_NAME)

PROJECTEMP (PROJ_NUM, EMP_NUM, EMP_NAME, JOBCLASS, CHG_HOUR, HOURS)

2NF – Remove partial dependenciesASSIGNPROJ (PROJ_NUM, EMP_NUM,HOURS) – partial dependencies – hours is nonkey attribute depend on 2 key attributes pro_num and emp_num.

PROJECT (PROJ_NUM, PROJ_NAME) – the normalized relation from 1NF

PROJECTEMP (EMP_NUM, EMP_NAME, JOB_CLASS, CHGHOURS) – transitive dependency – chghours is nonkey attribute but depend on job_class which is also nonkey attribute.

3NF - Remove transitive dependenciesEMPLOYEE(EMP_NUM, EMP_NAME, JOB_CLASS)JOB(JOB_CLASS, CHGHOURS)ASSIGNPROJ (PROJ_NUM, EMP_NUM,HOURS)PROJECT (PROJ_NUM, PROJ_NAME)