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Designing the fields in the data base
The following are the considerations one has to remain in mind while designing the fields in the data base.
- Range control
- Null value control
- Referential integrity
- Trigger a report listing missing values
- Substitute an estimate of the missing value
- In programs, ignore missing data unless the value is significant.
The First Normal Form (1NF) Let us first describe 1NF: Definition: A relation (table) is in 1NF if 1. There are no duplicate tuples or rows in the relation. 2.
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What is foreign key? A relation schema r1 derived from an ER schema may contain among its attributes the primary key of another relation schema r2.this attribute is known as a
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