>>>> But i'm not making any compare.
>>>> I just wrote delete from table; and i receive that message.
>>
>> Hmm. We will need to know more about your setup, since a simple
>>
>> delete from table;
>>
>> in psql does not involve *any* comparisons, and should never provoke the
>> message you are receiving.
Perhaps there is a foreign key constraint, or some such, being invoked
by this command?
regards, tom lane