I am trying to create a query that will calculate the 25th, 50th, and 75th
percentile of salaries within specific job codes. I currently have a table of
all the job codes I am looking for and it is linking to a table of all the
employees in the company (which includes their job codes and salaries). Does
anyone know the formula to calculate this?

The field names I am using a
[JobCode] = Specific Job Codes I am looking for
[CountofID] = Number of employees in the job
[AnnualRate] = Current Salary

I know in excel the formula is =Percentile(array,x). This is an ongoing
project and the list of jobs will constantly change (as well as the # of
employees in each job code) and am trying to get away from doing this in
excel.

Any help would be greatly appreciated!