How to select only rows which column has a null value?

Hi,
I adds rows to my table with data field set to null;
"INSERT INTO administrator.subzamowienia (subzamowienia.id_zamowienia,subzamowienia.id_transakcji,subzamowienia.nazwa_o,subzamowienia.nazwa_produktu,subzamowienia.ilosc,subzamowienia.nip_d,subzamowienia.data_realizacji) VALUES (administrator.id_zamowienia.curval,'0','PRAGA','Witaminy','2','43224','0');"
Then i would like to update this field after a time with new date.
To do this i need to know which rows has still data field set to null, i try sth like this but it doesn't work
"SQL> select * from administrator.subzamowienia where subzamowienia.data_realizacji='null';
select * from administrator.subzamowienia where subzamowienia.data_realizacji='null'
BŁĄD w linii 1:
ORA-01841: (pełny) rok musi być pomiędzy -4713 i +9999 i nie może być 0
or
"SQL> select * from administrator.subzamowienia where subzamowienia.data_realizacji='0';
select * from administrator.subzamowienia where subzamowienia.data_realizacji='0'
BŁĄD w linii 1:
ORA-01840: wartość wejściowa jest za krótka dla formatu daty
how to choose this rows?

Hi,
VALUES (administrator.id_zamowienia.curval,'0','PRAGA','Witaminy','2','43224','0');I don't see null value...
select * from administrator.subzamowienia where subzamowienia.data_realizacji='null'Should be :
select * from administrator.subzamowienia where subzamowienia.data_realizacji is nullNicolas.

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