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Sagot :
1. First normal form:
The first step in normalisation is putting all repeated fields in separate files and assigning appropriate keys to them.
2. Second normal form:
In this stage of normalisation, all non-key elements that are fully specified by something other than the complete key are placed in a separate table. Normally, these non-key elements are dependent on only a part of a compound key.
3. Third normal form:
This stage of normalisation enables eliminating redundant data elements and tables that are subsets of other tables. The redundant elements are those non-key data elements that are placed in more than one table of the virtual data elements.
The first step in normalisation is putting all repeated fields in separate files and assigning appropriate keys to them.
2. Second normal form:
In this stage of normalisation, all non-key elements that are fully specified by something other than the complete key are placed in a separate table. Normally, these non-key elements are dependent on only a part of a compound key.
3. Third normal form:
This stage of normalisation enables eliminating redundant data elements and tables that are subsets of other tables. The redundant elements are those non-key data elements that are placed in more than one table of the virtual data elements.
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