Do I use a Trigger here?
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  1. #1
    Join Date
    Nov 2001
    Posts
    118

    Do I use a Trigger here?

    Hi,

    I'm no developer but I've been asked to implement this functionality:

    I have a table that contains two columns (say A and B) that can contain either '0' or '1'.

    1) For an update, column A can only be given the value '1' if the value of column B is also '1' and

    2) an insert can only accept the value '1' in column A, if it also contains the value '1' for column B.

    Can anyone tell me how to do this?

    Thanks

  2. #2
    Join Date
    Nov 2002
    Location
    Geneva Switzerland
    Posts
    3,142
    create table fred(
    a number check(a in (0,1)),
    b number check(b in (0,1)),
    constraint cons1 check (b=0 or a=b))

    Always avoid a trigger if possible.
    Last edited by DaPi; 03-30-2006 at 07:19 AM.
    "The power of instruction is seldom of much efficacy except in those happy dispositions where it is almost superfluous" - Gibbon, quoted by R.P.Feynman

  3. #3
    Join Date
    Nov 2001
    Posts
    118
    Wow, thank you very much. Perhaps I should go back to selling burgers.

    Bye
    Peer

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