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Normalisation

  • 25-01-2010 10:03PM
    #1
    Hank Scorpio
    Closed Accounts Posts: 11,631 ✭✭✭✭


    Hi guys,

    Currently in college iv been given a unnormalised table and have to put it into 1NF, 2NF and 3NF. 2nd and 3rd i havent got a problem with, and not really with first, however, im having problems determining "Repeating Groups". What exactly is a repeating group?

    We get handed tables that are populated with 6 or 7 lines of data. I.e A customer table with custID/name/address/dob/company/xx/xx/xx.

    Iv read about it, but i would like a clear english defination if possible,

    Thanks.


Comments

  • #2
    booyah1024
    Closed Accounts Posts: 124 ✭✭booyah1024


    nuxxx wrote: »
    Hi guys,

    Currently in college iv been given a unnormalised table and have to put it into 1NF, 2NF and 3NF. 2nd and 3rd i havent got a problem with, and not really with first, however, im having problems determining "Repeating Groups". What exactly is a repeating group?

    We get handed tables that are populated with 6 or 7 lines of data. I.e A customer table with custID/name/address/dob/company/xx/xx/xx.

    Iv read about it, but i would like a clear english defination if possible,

    Thanks.

    what are the rest of the fields. Any that you've mentioned wouldn't constitute themselves as part of a repeating group tbh.


  • #3
    Dr.Silly
    Closed Accounts Posts: 1,759 ✭✭✭Dr.Silly


    Hi Nuxxx,

    Lets say you have an employee candidates table, and you want to track the languages a possible candidate may have.
    A candidate can have more than one language.

    So repeating groups would be

    candidate_id, first_name,last_name,dob, language1, language2, language3

    or better, to have two tables
    candidates table
    candidate_id, first_name, last_name, dob

    candidates_language table
    candidate_id
    language

    Cheers


  • #4
    Hank Scorpio
    Closed Accounts Posts: 11,631 ✭✭✭✭Hank Scorpio


    thanks for the replies guys.

    very helpful.

    i`ll post up an example or two tomorrow morning and hopefully ye can have a look.:)


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