Another problem with SQL Blob's is that they cannot be NULL :-(. (using the same testblob table as my previous mail) sql>insert into testblob(id, b) VALUES (NULL, NULL); MAPI = monetdb@localhost:50000 QUERY = insert into testblob(id, b) VALUES (NULL, NULL); ERROR = !ERROR: interpret_params s0_0(param 2): invalid sqlblob. I can probably work around this, but using empty blobs is less elegant than NULL values. Ronald