Hp Integrity NonStop J-Series Manual do Utilizador descarregar pdf (Página 240)

100

101

Sample Project-Tracking System

Checking for Normalization

S5044-062

Projects

proj-code

prof-desc

proj-start-date

proj-end-date

prof-mgr

Events

proj-code/

event-num

event-desc

predict-start-date

predict-end-date

revised-start-date

revised-end-date

change-info

update-emp

Respfor

proj-code/

event-num

emp-no

Employs

emp-no

emp-name

emp-dept

Figure 12-8. Possible Relationships Between Files and Keys

Checking for Normalization

A relational data base is usually normalized. In the simplest

terms, this means that no file in the data base contains

repeating data. As Figure 12-8 shows, no file used by the sample

project-tracking system contains repeating groups. Therefore,

these files are sufficiently normalized for use by an ENABLE

application.

If you are developing your own application, refer to Section 3

for a discussion of the normalization process.

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