I'm trying to design a DB that will keep track of Overtime worked sorted by Time first then Senority. Employees can only work on specific types of equipment. I first sort a list of equipment employees can work on and then hour and senority. I would like to update an OT table using a forum that I can enter OT date and hours worked. I tried using a query but it won't let me update the OT table.

I have attached what I have inprogress. Thanks in advance for the help.