When creating a table via a script, in the SQL Editor:
e.g.
create table test
(
c1 varchar2 (15 byte) not null,
date date not null,
);
If you then use the Extract DDL option on the created table, the script is returned as follows:
create table test
(c1 varchar2(15 byte) not null,
date date ,
noparallel
logging
monitoring
/
-- Constraints for TEST
alter table test
add check ("DATE" IS NOT NULL)
/