How to pass multi-value input parameter to SQL command

I'm having trouble following the threads related to passing multi-value parameters to a SQL command.
I need more details on the work-around that exists for using a dummy main report to GET the input parameters and pass them to a subreport parameter that uses the input parameters in its sql command WHERE clause.
So far the main report prompts user to enter badge numbers into a multi-value string type parameter field called badgeNumber.
The main report getRequesters command executes the following SQL:
SELECT requester FROM lawprod.requester WHERE lawprod.requester.requester IN '{?badgeNumber}'
order by requester
The main report also contains a formula called requesterList that concatenates the input parameters and separates the values with commas: (Join ({?badgeNumber}, ", ")
So if user enters badge numbers 1 and 2 and 3 the value of requesterList is 1, 2, 3
From the main report I've used the Insert Subreport command to choose an existing report, and used the link tab to link @requesterList to ?requester; where ?requester is a multi-value parameter that is used in the subreport's SQL query as shown below:
WHERE (lawprod.ictrans.update_date <= {?endDate} AND
       lawprod.ictrans.update_date >= {?startDate} AND
       lawprod.ictrans.doc_type = 'IS' AND
       lawprod.ictrans.system_cd = 'RQ' AND
       lawprod.mmdist.posting_type = 'O1')
      AND
      (lawprod.ictrans.company = lawprod.mmdist.company AND
       lawprod.ictrans.system_cd = lawprod.mmdist.system_cd AND
       lawprod.ictrans.location = lawprod.mmdist.location AND
       lawprod.ictrans.doc_type = lawprod.mmdist.doc_type AND
       lawprod.ictrans.document = lawprod.mmdist.doc_number AND
       lawprod.ictrans.shipment_nbr = lawprod.mmdist.doc_nbr_num AND
       lawprod.ictrans.line_nbr = lawprod.mmdist.line_nbr AND
       lawprod.ictrans.component_seq = lawprod.mmdist.component_seq)
      AND
      (lawprod.ictrans.company = lawprod.reqline.company AND
       lawprod.ictrans.document = lawprod.reqline.req_number_a AND
       lawprod.ictrans.line_nbr = lawprod.reqline.line_nbr AND
       lawprod.reqline.company = lawprod.reqheader.company AND
       lawprod.reqline.req_number = lawprod.reqheader.req_number)
       AND
       (lawprod.reqheader.requester in '{?requester}')
Following execution of the main report, Crystal appears to prompt for three values as expected: badge numbers for the main report, and start and end dates needed by the subreport.   I can't figure out why Crystal XI returns no data. Can anyone explain what I'm missing?
Edited by: Patricia Sims on Sep 21, 2009 9:30 PM

The reason no data is returned is that the multiple values are not (properly?) passed to the main report's SQL. The main report's SQL should be (MS SQL):
select 1 as dummy
This causes exactly one record to be returned, which will basically be ignored (except the fact that it will drive the subreport; any query that returns only 1 record will suffice...).
Change the concatenation of the selected values to be (basic syntax):
formula = "|" + join({?badgeNumber}, "|") + "|"
The leading and trailing vertical bars are important (otherwise a database value of 1 might match a selection of 123).
Pass the concatenated string as the parameter value to the subreport. In your subreport, select records on (basic syntax):
formula = (instr({?sr-badgeParam}, "|"+cstr({requester},"0") + "|") > 0)
(assumes is numeric in the database, and is integer; modify or eliminate cstr() if otherwise...)
Put your subreport on the detail format of the main report, and you're all set...
HTH,
Carl

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