(
    subject  capitaltext,  -- The subject to be added
    title    text,         -- The title of the subject
    "level"  int,          -- The level of the subject
    duration int,          -- The duration of the subject
    gender   gender[] default '{F,M}',  -- The genders of the students who can take the subject
    notes    text default null,         -- Any notes about the subject
    out res  lectures.subjects          -- The newly inserted row
)