>I'm working in a new proyect which is for a school to have a control with the entrance of the teachers(they have to check the time at which they arrive to school)but I don't know how to do it .
>any ideas????

One table with a user id (primary key) and teacher name. A second table to clock the teacher In or Out with a DateTime field. I did one of these, and it is fairly simple to do. I had code to search for the last time clock entry for the person user id. If the OUTTIME was not empty, then the person was clocking in. If the OUTTIME field was empty, then the person was clocking out. If clocking in, I added a new record and populated the fields with the user id and the datetime().