Time And Attendance Coding Database

Hi All,

I am setting up a database to help me prepare codes for employees timesheets in order to upload them into our payroll software. The table structure below is just my preliminary thoughts and current ideas and I guess I'm looking for ideas on how to work with my codes.

EMPLOYEE TABLE
EmpID (PK) - Employee ID # [Autonumber]
Surname - Employee's surname [Text]
Firstname - Employee's first name [Text]

ATTENDANCE TABLE
ShiftID (PK) - Shift ID# [Autonumber]
EmpID (SK) - Employee ID# [Foreign Key]
Date - Date of shift [Date/Time]
Start - Start time of shift [Time]
Finish - Finish time of shift [Time]
CostCtr - Cost centre being billed for shift. [Integer]

When employees work they are entitled to the following:
* Ordinary hours (code 001) for all hours worked.
* 10% penalty (code 006) for all hours worked when shift finishes after 18:00
* 12% penalty (code 007) for all hours when shift crosses midnight
* 50% penalty (code 008) for hours worked on a saturday
* 100% penalty (code 009) for hours worked on a sunday

The following shows data that in my Attendance table for an employee who worked shifts on the 16th (Mon), 17th (Tue), 20th (Fri), and 22nd (Sun).
ShiftIDEmpIDDateStartFinishCostCtr
18443416/10/0610:0019:00
28443417/10/0610:0019:003002
38443420/10/0622:0006:003001
48443422/10/0614:0022:00
From the above data I believe I will need to make another table that contains the entitlement codes generate from each shift.

For the first shift on Monday 16/10/06 I need to collect the following codes for the total calculation:
CodeHoursCostCtr
0019.00
0069.00

For the second shift on Tuesday 17/10/06 I need to collect the following codes for the total calculation:
CodeHoursCostCtr
0019.003002
0069.003002

For the third shift on Friday 20/10/06 I need to collect the following codes for the total calculation:
CodeHoursCostCtr
0018.003001 'Ordinary hours worked
0078.003001 '12% penalty as shift crossed midnight hour
0086.003001 'Only worked 6 actual hours on the Saturday as 2 hours were on Friday night.

For the fourth shift on Sunday 22/10/06 I need to collect the following codes for the total calculation:
CodeHoursCostCtr
0018.00'Ordinary hours worked
0098.00'Hours worked on the Sunday

From that information the only data I really need to store in a table would be the totals grouped by code and cost centre. Eg.,
CodeHoursCostCtr
00117.00
001 8.003001
001 9.003002
006 9.00
006 9.003002
007 8.003001
008 6.003001
009 8.00
Does anyone know the best way to go about this? Should I generate a new table that links these codes to an employee? Should I make a function to calculate the codes for each day and store them in a table or make the function only sum the code totals for the week and store them in a table?

Brad