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Cognos how to use the prompt dates in queries

Hi

I have a report that uses date prompts to select data from contracts. (cognos8)

Basically you enter a start date and an end date and I have created queries that select data between those dates.

What I need to do though is count the number of emplyees on a contract for each month between the dates entered. for example if I enter the start prompt as 01/12/07 and the end prompt as 31/12/08 I want the count of employees from 01/12/07 to 31/12/07 and then the 01/01/08 to the 31/01/08 and then the same for Feb, March, April etc all the way to Dec 08 (end prompt date) and then add them all together at the end! Any ideas welcome!!
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ac_davis2002
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ac_davis2002
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RWrigleyCommented:
I'm assuming you're using a relational model.  I'd probably create a data item that uses the "extract" function to pull the "month" out of the date, and group by that.  I'd probably have another dataitem called "OnContract" that determines if an employe was on contract on a given date, and has a value of 0 or 1.  Then , we can simply use the automatic aggregation to figure out how many employee's were on contract in any given grouping.
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ac_davis2002Author Commented:
I am using a relational model yes.

That sounds like what I need.

Are you able to send me any example of the "extract" function?

This is the select statement I can use to extract the infomation for just one month

Select CPCompanyid,NoEmployees as noemp from CTContracts where Fromdate  
<= '20080430' and  EndDate >= '20080401' and CTcontracts.LKContractTypeID in (0,8) Order by CPCompanyid,ctcontractid  

The bit I am struggling with is using this statement in conjunction with the start and end date prompts and moving the dates forward to meet the time scales I need.
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ac_davis2002Author Commented:
Cheers!
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