Mahmoud,>Are these values atomical? >My other question is what are the repercussions of >not putting a table in 2nd and 3rd Normal Form.Your 'choice1-subchoice1' etc are combined values, so they aren't atomic. From your three example dropdown values, it looks as if 'choice' and 'subchoice' have a many-to-many relationship, and if that's so, you'll probably need a second table for 'subchoice' and a third table to store combinations of choice and subschoice. There are examples of disadvantages of not putting a table in 2NF or 3NF at http://www.artfulsoftware.com/mysqlbook/sampler/mysqled1ch01.pdf, click on 'Normalisation and the normal forms', & read the sections on 1NF, 2NF and 3NF. PB ----- Mahmoud Badreddine wrote: Hello, I have two questions: I would like to know whether I am violating the principle of atomicity in doing the following:I have a form which has a field with the following options: Choice1, choice2 and choice3. Each of the above choices have two further subchoices : subChoice1, subchoice2. so in my form I have a pull-down list and these are the choices I have: choice1-subchoice1 choice1-subchoice2 choice2-subchoice1 .... .... and so on. Are these values atomical? My other question is what are the repercussions of not putting a table in 2nd and 3rd Normal Form. Thank you. |
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