I am trying to find the equivalent of these two Sybase system columns : check_on_commit (Y/N) - Indicates whether INSERT and UPDATE commands should wait until the next COMMIT command to check if foreign keys are valid. A foreign key is valid if, for each row in the foreign table, the values in the columns of the foreign key either contain the NULL value or match the primary key values in some row of the primary table. nulls (Y/N) - Indicates whether the columns in the foreign key are allowed to contain the NULL value. Note that this setting is independent of the nulls setting in the columns contained in the foreign key. Maybe pg_constaint.condeferrable is appropriate for check_on_commit? I'll appreciate any help Thanks in advance, Emil __________________________________________ Yahoo! DSL ? Something to write home about. Just $16.99/mo. or less. dsl.yahoo.com