Retrieving Database Data

In my employee attendance database each record contains an employee id#, a number corresponding to an attendance infraction, and a corresponding date. Each week a clerk queries the database to pull up records for all employees who have a yearly 'total number' of infraction values over a certain numerical limit.
Any suggestions as to what is the best way to:
1 - Calculate that yearly 'total number' for every employee.
2 - Retrieve the date of the most recent attendance infraction for each employee that has a total value that is over the limit?

Thanks