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Thread: Usage of RDBMS

  1. 07-28-2007 08:44 PM #1
    lboard1982
    lboard1982 is offline Junior Member
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    Thumbs up Usage of RDBMS

    Hi Friends,

    I was a little bit confused about RDBMS. Please help urgently.
    EG :

    Table 1 : Name, Age, Empid
    Table 2 : DOB, ID, Salary

    This is called RDBMS right as it is joining two tables having a common field ID/EmpId. Instead of having two tables why cannot we have only one table with all the fields in it. What is the necessity of creating a new table and connecting them using a primary key.In a single table also we can perform SQL query to get the results.

    Please help urgently as i am having a seminar on coming tuesday
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  2. 07-29-2007 12:20 AM #2
    PAVB's Avatar
    PAVB
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    are you teaching this stuff?
    Pablo (Paul) Berzukov

    Author of Understanding Database Administration available at amazon and other bookstores.

    Disclaimer: Advice is provided to the best of my knowledge but no implicit or explicit warranties are provided. Since the advisor explicitly encourages testing any and all suggestions on a test non-production environment advisor should not held liable or responsible for any actions taken based on the given advice.
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  3. 07-29-2007 10:29 AM #3
    slimdave
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    http://en.wikipedia.org/wiki/Relational_model
    David Aldridge,
    "The Oracle Sponge"

    Senior Manager, Business Intelligence Development
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  4. 07-30-2007 01:45 AM #4
    Bore
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    Is this one to one relationship?
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  5. 07-30-2007 09:26 AM #5
    lboard1982
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    Quote Originally Posted by PAVB
    are you teaching this stuff?

    Yessssssssssssss. Thanks for your help
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  6. 07-30-2007 09:31 AM #6
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    PAVB
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    Quote Originally Posted by lboard1982
    Yessssssssssssss.
    No offence but, I'm wondering how can you sleep at night
    Pablo (Paul) Berzukov

    Author of Understanding Database Administration available at amazon and other bookstores.

    Disclaimer: Advice is provided to the best of my knowledge but no implicit or explicit warranties are provided. Since the advisor explicitly encourages testing any and all suggestions on a test non-production environment advisor should not held liable or responsible for any actions taken based on the given advice.
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  7. 07-30-2007 12:09 PM #7
    jhmartin
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    Those would normally be one table since they have a 1:1 relation. Also, 'Age' should not be stored as it is derived from DOB, otherwise you have to recalculate all the Age fields every day.
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  8. 07-31-2007 02:08 AM #8
    Bore
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    That was my question about, is it one to one relation, it seems to be but who knows....
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