Library /sys$common/syshlp/SQL$HELP72.HLB  —  ALTER  DOMAIN  Arguments  SET_DEFAULT
    Provides a default value for a column if the row that is inserted
    does not include a value for that column. A column default
    value overrides a domain default value. If you do not specify
    a default value, SQL assigns NULL as the default value. For more
    information about NULL, see the NULL_Keyword HELP topic.
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