The INSERT statement has the form:
INSERT device:index;modifier,modifier...;item:name,item:name,...
and writes a record into a database file in the appropriate format.
Where named items belong to associated files, if they match existing values, and random-access files are being used, nothing is added; otherwise, a single record is added, in the position determined by the field which is the key for that file. It is not allowed to write data associated with a key if that key is not also specified in the INSERT statement.