Firstly, this is the task I'm faced with...

I've got a worksheet (Maintenance Data) listing 26,000 scheduled jobs to be undertaken in schools around birmingham from 2008 - Then I've got 5 other sheets (PM Orders 08-09, PM Orders 09-10 etc) containing approx 65,000 emergency jobs that have been completed since 2008.

What I need is to make sure none of the 65,000 completed are in with the 26,000 needing to be undertaken.


Maintenance Data contains the following column headings:
A: Site Type - B: School Code - D: Standardised School Name - E: Priority Code - G: Condition Code - I: Location - J: Element - K: Sub Element - L: Defect - M: Remedy - N: Date Entered - P: Repair Estimate Current - Q: Standardised Description - R: Sub Contractor 1 - S: Sub Contractor 2

PM Orders contains the following column headings
A: School Name - B: Standardised School Names - C: Site Type - D: School Code - E: Order No. - F: Planner Group - G: Fault Description - H: Order Type - I: Start Date - J: Total Planned Costs - K: Total Actual Costs

What I have done is to assign a unique code to each school across all work sheets however other than that there are no similar data fields so I'm at a loose end as to where to start?

How would you guys go about doing this?

Any help, GREATLY appreciated!