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Thread: Default Data for Column Question

  1. #1
    Join Date
    Aug 2000
    Hi Folks,

    Can I define a default value for a column based on a column value in another table? eg. alter table product modify location_id (default select location_id from user_listing where product.user_id = user_listing.user_id). Thanks for the help.

  2. #2
    Join Date
    Dec 2000
    Ljubljana, Slovenia
    NO, you can't.
    Jurij Modic
    ASCII a stupid question, get a stupid ANSI
    24 hours in a day .... 24 beer in a case .... coincidence?

  3. #3
    Join Date
    Sep 2000
    You *might* be able to do that with a "before insert" trigger. The problem I used to always run into with triggers was the "mutating table" error, but I could usually work around it.


  4. #4
    Join Date
    Mar 2001
    macswell is right, you can do it if you use the before insert trigger. Just remember that you cannot do a select on the table that the trigger is on or even selects on that table in a roundabout way (does an insert on another table that selects from the original).

    To get the default value, the query would be like:

    select location_id
    into :new.user_id
    from user_listing
    :new.user_id = user_listing.user_id

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