Good time of day! I've got some strangeness/bug when working with my own datatype in PostgreSQL. Here's a short description of the sitiation: I've developed a 1-byte integer datatype (let's call it "int1"). The input and output functions for this datatype I wrote myself. Everything works just fine except for the following: I create a table "test_int1" with two columns "i4" and "i1" of type "int4" and "int1" respectively. When I insert a new row into this table without providing a value for the "i1" column, I get a value of "45" in it. The column doesn't have any default values. Neither it has "not null" option set. If I explicitly provide a NULL value for this column in an insertion statement, I get what I expect - a NULL value for the column. Not-supplying a value for any original PGSQL datatype (say, "int4") also makes it correctly - I see a NULL value. Any comments/suggestions? I have PostgreSQL 7.0.3 on FreeBSD 4.2-STABLE. Best regards. Konstantin Solodovnikov.