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Status Not under consideration
Workspace IBM i
Categories Db2 for i
Created by Guest
Created on Jul 1, 2019

Allow overriding system value on update of audit columns

Currently doing an SQL update with overriding system value on a column defined as "Generated Always For Each Row on Update as Row Change" results in an SQL0109 saying that it is only allowed on columns defined as Generated Always ??? (probably it only works on identity columns).

Use Case:

In some rare situations I would like to update a row without changing the audit timestamp value, however currently this is not possible, not even with the "overriding system value" clause.

Idea priority High
  • Guest
    Jan 16, 2021

    IBM does not intend to provide an additional solution to this request at this time, so it is being closed.

    You can use OVERRIDING SYSTEM VALUE on the update statement and assign the row change timestamp column to its current value.

    create table ga (
    c1 int,
    c2 timestamp not null generated always for each row on update as row change timestamp);
    insert into ga (c1) values (1);

    --The following will maintain the value of C2
    update ga overriding system value
    set c1 = 2, c2 = c2;

  • Guest
    Aug 19, 2019

    You will get an SQL0109 error if you specify OVERRIDING SYSTEM VALUES and you are changing a generated column.
    In order to override the system value you must specify a value for the generated column.

    create table (c1 int, c2 timestamp Not null generated always For Each Row on Update as Row Change timestamp )
    insert into (c1) values(1)

    The following will work and will insert the user specified value for C2.
    update overriding system value set c1 = 2, c2 = '2019-08-19-'

    The following will generate a new value for C2:
    update overriding system value set c1 = 2

    The following will return an error:
    update overriding system value set c1 = 2
    SQL0109 OVERRIDING clause not allowed.

  • Guest
    Jul 2, 2019

    Being able to override the audit value would defeat the purpose of having the database do that update for you.