Oracle Error Codes

cannot update (string) to NULL

An attempt was made to update a table column “USER”.”TABLE”.”COLUMN” with a NULL value.For example, if you enter:connect scott/tiger update table a (a1 number not null); insert into a values (null); Oracle returns:ORA-01407 cannot update (“SCOTT”.”A”.”A1″) to NULLwhich means you cannot update the column “SCOTT”.”A”.”A1″ to NULL.

How to Solve :

Retry the operation with a value other than NULL.