Count Distinct employees between two dates

Question

I'm having a headache trying to figure this out and I can't seem to find the correct way of doing it. Any help would be greatly appreciated.
I'm needing to get a distinct number count of weekly employees by month that have worked or received pay for the pay period that includes the 12th of the month. The employees should only be counted once per month even though they might have worked and gotten paid during the pay period that includes the 12th of the month. I will give below the column names an example of the data.
emp no_
00001
pay type_
week
pay period start date_
01-09-12
pay period end date_
01-15-12
pay date_
01-12-12
work date_
01-11-12

Answer 1

Hi,
housetiger77 wrote:
Thank you for your response. I'm working with Oracle Report Builder 10g. Your front-end tool can be significant, but it's much more important to know which database versions you have.
There is no version 10f or 10h, so it's kind of silly to say you have 10g. Give your real, full version, e.g. 10.2.0.4.0.
To find your database version, run
SELECT  *
FROM    v$version;The first line of output will have the database version.
The report will be grouped by month, state, and work location. For each work location it will give me the distinct number of employees who worked or received pay for the pay period which includes the 12th of the month.
The columns are as follows:
SELECT
phy_emp_no,
phy_date,
phy_actual_pay_date,
phy_ppr_period,
ppr_start_date,
ppr_end_date
FROM pyemppayhist, pycompayprd
where phy_prn_code = ppr_prn_code
and ppr_year = '2012'
and phy_tran_code = 'NWHR'
Below is my data example. I do not know how to put it in here without the rows and columns being all jumbled up. Sorry!That means you haven't read the forum FAQ yet. {message:id=9360002}
Take a couple of minutes to read it now; it will be a very good use of your time. What you need to do, including how to use \ tags to preserve formatting, is all explained in that message.  (Actually, it's not so inportant that your CREATE TABLE and INSERT statements be formatted, but it's esy to do, and you have to learn how to do it anyway to post your results.)
When you're ready to continue, post CREATE TABLE and INSERT statements for your sample data, the exact results you want from that data, and an explanation of how you get those results from that data.
What's wrong with the solutions you've already received?  Point out where they're getting the wrong results from your sample data, and explain how you might get the right results in those places.