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Normalisation
Normalisation ,[object Object]
Aims of Normalisation ,[object Object],[object Object],[object Object],[object Object],[object Object]
Duplication vs Redundant Data ,[object Object],[object Object]
Stages of Normalisation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
 
First Normal Form ,[object Object]
Non-Normalised Table STUDENT
First Normal Form ,[object Object],[object Object],[object Object]
First Normal Form STUDENT
Over to you...
Second Normal Form A table is in the second normal form if it's in the first normal form AND no column that is not part of the primary key is dependant only a portion of the primary key
Second Normal Form ,[object Object]
Functional Dependency ,[object Object],[object Object],[object Object]
Table in 1NF
Functional Dependency ,[object Object],[object Object],[object Object],[object Object]
Second Normal Form
Over to you...
Table in Second Normal Form
Third Normal Form A table is in the third normal form if it is the second normal form and there are no  non-key columns  dependant on  other non-key columns  that could not act as the primary key.
Table in Second Normal Form
Table in Third Normal Form
Boyce-Codd Normal Form All attributes in a relation should be dependant upon the key, the whole key and nothing but the key
Important Papers ,[object Object],[object Object]
Table in Third Normal Form
Redundancy in 3NF ,[object Object],[object Object]
Tables in BCNF
Difference between BCNF and 3NF ,[object Object]
Fourth  Normal Form Fourth normal form (or 4NF) requires that there be no non-trivial multivalued dependencies of attribute sets on something other than a superset of a candidate key. A table is said to be in 4NF if and only if it is in the BCNF and multivalued dependencies are functional dependencies. The 4NF removes unwanted data structures: multivalued dependencies.
Fifth  Normal Form Fifth normal form (5NF and also PJ/NF) requires that there are no non-trivial join dependencies that do not follow from the key constraints. A table is said to be in the 5NF if and only if it is in 4NF and every join dependency in it is implied by the candidate keys.
Domain/Key Normal  Form Domain/key normal form (or DKNF) requires that the database contains no constraints other than domain constraints and key constraints.

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Databases: Normalisation

  • 2.
  • 3.
  • 4.
  • 5.
  • 6.  
  • 7.
  • 9.
  • 10. First Normal Form STUDENT
  • 12. Second Normal Form A table is in the second normal form if it's in the first normal form AND no column that is not part of the primary key is dependant only a portion of the primary key
  • 13.
  • 14.
  • 16.
  • 19. Table in Second Normal Form
  • 20. Third Normal Form A table is in the third normal form if it is the second normal form and there are no non-key columns dependant on other non-key columns that could not act as the primary key.
  • 21. Table in Second Normal Form
  • 22. Table in Third Normal Form
  • 23. Boyce-Codd Normal Form All attributes in a relation should be dependant upon the key, the whole key and nothing but the key
  • 24.
  • 25. Table in Third Normal Form
  • 26.
  • 28.
  • 29. Fourth Normal Form Fourth normal form (or 4NF) requires that there be no non-trivial multivalued dependencies of attribute sets on something other than a superset of a candidate key. A table is said to be in 4NF if and only if it is in the BCNF and multivalued dependencies are functional dependencies. The 4NF removes unwanted data structures: multivalued dependencies.
  • 30. Fifth Normal Form Fifth normal form (5NF and also PJ/NF) requires that there are no non-trivial join dependencies that do not follow from the key constraints. A table is said to be in the 5NF if and only if it is in 4NF and every join dependency in it is implied by the candidate keys.
  • 31. Domain/Key Normal Form Domain/key normal form (or DKNF) requires that the database contains no constraints other than domain constraints and key constraints.