Timetable (time period)


	Type	Length	PK	FK		Mode			Mandatory		Remarks
				Table	Field	Read	Write	Delete	Create	Update
code	STRING	80	X	timetable	code	X	X	X
model name	STRING	80	X	timetable, time period	model name		X
sequence	NUM					X	X	X
time period	STRING	80	X	time period	code	X	X	X
unique key	STRING	255				X	X	X			[timetable]code (padded with spaces to 80 characters) + [time period]code (padded with spaces to 80 characters)