Selection Screen Parameters in SQL statements

Very new ABAP programmer here, so sorry if this is a really dumb question.
I'm trying to use my selection screen parameters to limit what is pulled in by my SQL statement (which seems to me to be a very logical thing to do). But I'm having a problem, that when no values are entered in the parameters, no data is returned in the table instead of all the data being returned.
Here is the code I have now:
SELECT cname1 akostl aorgeh asname apernr bbegda bendda bstatu
         bconfl bmedcf breasn breman b~rqday
INTO CORRESPONDING FIELDS OF TABLE it_record
   FROM ( ( pa0001 AS a
      INNER JOIN pa0672 AS b ON bpernr = apernr )
      INNER JOIN t500p AS c ON cpersa = awerks )
WHERE b~reman in so_reman
    AND a~kostl in so_kostl
    AND a~orgeh = p_orgeh
    AND b~begda = p_begda
    AND b~statu = p_statu
    AND b~confl = p_confl
    AND b~medcf = p_medcf
    AND b~reasn = p_reasn
    AND b~rqday = p_rqday
    AND c~name1 = p_name1.
Can anyone tell me what I'd need to do to make it return properly?

When you use parameters and no value is entered, it is treated as initial value. and the select statement looks for the initial values for those fields in the tabl;e...
you can make the parameters mandatory..then the user would be forced to enter something....
also you could do the following..
instead of parameters, use select-options with the addition no intervals and no extension, then practically it looks like a parameter but internally it is a select-option...
and in the select statement, give conditions like....field1 in <s_option name>....in this case if the user is not entering a value ...it is treated as *...
Thnaks & Regards,
Renjith

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ABAP Query Selection screen parameters

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Hi,
GO to info set transaction SQ02
Give the infoset
Press change
Press the selections button..Shift F7
In the right hand side you will get a table control to enter the selection screen parameters..
Press create button on top of the table control to create new parameters
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Naren

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Hi Experts
 I have a ABAP report that displays data using ALV.
When I double click a cell it calls transaction MB51. Before calling the transaction I need to set some parameters of the selection screen of the transaction.
My code is like below:
<UL>
 <LI>FREE MEMORY ID 'MAT'. "material
 <LI> FREE MEMORY ID 'WRK'. "plant
 <LI> FREE MEMORY ID 'CHA'. "batch
 <LI>* Get the selected ALV row data
 <LI>READ TABLE i_recon INDEX p_selfield-tabindex INTO x_recon.
 <LI>* If link MB51 is clicked then open tcode MB51
 <LI> IF p_selfield-sel_tab_field+8(4) = 'MB51'.
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 <LI> SET PARAMETER ID 'MAT' FIELD x_recon-matnr.
 <LI> SET PARAMETER ID 'WRK' FIELD p_plant.
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</UL>
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</UL>
<UL>
 <LI> 2. Then in another session I run my report. In the report ALV I have selected a record where plant = AB01, Material = 990001 but Batch is blank. But it opens the transaction with plant = AB01, Material = 990001 and Batch = 10001.
Even though in my ALV record the batch is blank yet it uses the batch value from the memory. That is, the batch value that was given in the transaction earlier. Why it is not getting cleared? I have also used FREE MEMORY ID code in the beginning. But still it is not clearing the values in the memory.
</UL>
<UL>
 <LI>What shall I do to clear all the selection screen parameters before calling the transaction?</LI>
</UL>
<UL>
 <LI>
Thanks
Gopal
</LI>
</UL>
Edited by: gopalkrishna baliga on Aug 11, 2010 10:29 AM

Its because sap memory is globally shared.
Do it like this.
READ TABLE i_recon INDEX p_selfield-tabindex INTO x_recon.
IF p_selfield-sel_tab_field+8(4) = 'MB51'.
perform bdc_dynpro using 'RM07DOCS' '1000'.
perform bdc_field using 'BDC_OKCODE' '=ONLI'.
perform bdc_field using 'MATNR-LOW' x_recon-matnr.
perform bdc_field using 'WERKS-LOW' p_plant.
perform bdc_field using 'CHARG-LOW' p_batch.
perform bdc_field using 'DATABASE' 'X'.
call transaction 'MB51' with i_bdcdata mode 'E'.
endif.
form bdc_dynpro using program dynpro.
clear la_bdcdata.
la_bdcdata-program = program.
la_bdcdata-dynpro = dynpro.
la_bdcdata-dynbegin = 'X'.
append la_bdcdata to i_bdcdata.
endform.
form bdc_field using fnam fval.
 clear la_bdcdata.
 la_bdcdata-fnam = fnam.
 la_bdcdata-fval = fval.
 append la_bdcdata to i_bdcdata.
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How to restrict or stop the same data provided in selection screen parameters its should stop fetch the data on previously provided data?

Hi Developer,
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thanks.
ravi.

Hi Somendra,
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skip.
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please guide me in solving the issue sir.
thanks,
Ravi

Hi its urgent...help on selection screen parameters

Hi all,
I need help on selection screen parameters.
requirement is that,
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Hi ..
While declare the Matnr, Plant etc dont use the OBLIGATORY addition.
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Edited by: Pawan Kesari on Dec 24, 2009 3:33 PM

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Hi,
I enter values in parameters on screen and generte output(add values to table/view report). After I return to originial screen, the fields should be reset to initial empty status.
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Thanks
Praveen

Hi,
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