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Normalization

Normalization. Prepare by mu’tasem jarrah Mutasem.jarrah@yahoo.com . What is Normalization ?.

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Normalization

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  1. Normalization Prepare by mu’tasem jarrah Mutasem.jarrah@yahoo.com

  2. What is Normalization ? Database normalization is a technique for designing relational database tables to minimize duplication of information and, in so doing, to safeguard the database against certain types of logical or structural problems, namely data anomalies. to avoiding duplicate data and easy maintence it depends on entity relationship between columns

  3. Comprehensive Example contains 1NF,2NF and 3NF * To get 1NF (Remove the Repeating groups)

  4. Table 1 Table 2

  5. Connection between table 1 & table 2? • Table1 (Receipt, Date, Customer_ID, Customer_Name, Phone, City) • Table2(Receipt, Vedio_ID, Vedio_Name, Type, Days, Cost) * To get 2NF (Identify & Remove Partial FD) • Table 2 : Table3, Table4 • Vedio_ID ----- [ Vedio_Name, Type, Days, Cost] Table 3

  6. Table 4

  7. * To get 3NF (First Step – From table1) ---[ Table5,Table6] • Table1 ( Receipt, Date, Customer_ID, Customer_Name, Phone,City) • Customer_ID -----[Customer_Name, Phone,City]. Table 5 Table 6

  8. (Second Step – From table3) • Vedio_ID ---[Vedio_Nmae] • Vedio_ID---[Type] • Type---[Days,cost] • From table3 :- Table7, Table8

  9. Table 7 Table 8

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