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primary key

Discussion in 'Information Technology' started by shar, Jul 28, 2006.

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  1. shar

    shar
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    how do you choose a proper field so as to be set as a primary key?
    thanks sharon
     
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  3. Joseph Meehan

    Joseph Meehan
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    shar wrote:
    > how do you choose a proper field so as to be set as a primary key?
    > thanks sharon


    You would choose or create a field that would be unique for each record.
    That is there is and will not be any duplicates. Normally you would want
    that field to be small, like a number but there is no requirement.



    --
    Joseph Meehan

    Dia duit
     
  4. shar

    shar
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    "Joseph Meehan" wrote:

    > shar wrote:
    > > how do you choose a proper field so as to be set as a primary key?
    > > thanks sharon

    >
    > You would choose or create a field that would be unique for each record.
    > That is there is and will not be any duplicates. Normally you would want
    > that field to be small, like a number but there is no requirement.
    >
    >
    >
    > --
    > Joseph Meehan
    >
    > Dia duit
    >
    > so if u had 4 fields: product ID, product name, discontinued and Unit price, the obvious ans would be product ID right?
    >
     
  5. shar

    shar
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    "Joseph Meehan" wrote:

    > shar wrote:
    > > how do you choose a proper field so as to be set as a primary key?
    > > thanks sharon

    >
    > You would choose or create a field that would be unique for each record.
    > That is there is and will not be any duplicates. Normally you would want
    > that field to be small, like a number but there is no requirement.
    >
    >
    >
    > --
    > Joseph Meehan
    >
    > Dia duit
    >
    > so if you had 4 fields say product ID, product name, discontinued and unit price the primary key would be product ID right?
    >
     
  6. Joseph Meehan

    Joseph Meehan
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    Guest

    shar wrote:
    > "Joseph Meehan" wrote:
    >
    >> shar wrote:
    >>> how do you choose a proper field so as to be set as a primary key?
    >>> thanks sharon

    >>
    >> You would choose or create a field that would be unique for each
    >> record.
    >> That is there is and will not be any duplicates. Normally you would
    >> want
    >> that field to be small, like a number but there is no requirement.
    >>
    >>
    >>
    >> --
    >> Joseph Meehan
    >>
    >> Dia duit
    >>

    > so if u had 4 fields: product ID, product name, discontinued and
    > Unit price, the obvious ans would be product ID right?


    Likely. You would want to check to make sure there were no duplicates.
    Likely you would want to do that anyway. :)



    --
    Joseph Meehan

    Dia duit
     
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