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How can I eliminate repeated values in my query?

Posted on 2008-10-08
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Last Modified: 2011-10-19
Hi There,

I have a query which works correctly until I add my case (CASE WHEN mv.end_date is null THEN 'Yes' ELSE 'No' END) Terminal_Group_Active)  to the select list.  mv.end_date is null when active and has an actual date when enddated. What I am finding is the active records are displaying twice , once with  'Yes' and once with 'No'. Any idea why?

Thanks,
R

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Question by:Rhonda Carroll
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Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 22671789
the CASE statement as such will not produce duplicates...
there must be some other part of the query (ie a GROUP BY)...

please clarify
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Author Comment

by:Rhonda Carroll
ID: 22677086
Hi angellll,

My query is attached, with the case statment in the select, it returns 2 rows, if i comment it out and uncomment and mv.END_DATE is null, it will return one row.(These rows have identical info).
Thanks,
R
Query.doc
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Accepted Solution

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Guy Hengel [angelIII / a3] earned 125 total points
ID: 22677112
what about:
SELECT     mh.mobile_id, 
 	    mv.INMARSAT_ISN, 
	    mh.CUSTOMER_CODE, 
	    mh.SDATE AS Start_Date, 
	    to_char(mh.EDATE, 'DD/MM/YYYY') AS End_Date, 
	    SSM2.FIRST_name || ' ' || ssm2.last_name AS Sales_Manager, 
		mv.terminal_group_code, 
		tg.terminal_group_name ,
		tgv.contract_code ,
		MAX(CASE WHEN mv.end_date is null THEN 'Yes' ELSE 'No' END) Terminal_Group_Active,
		cs.AGENT_S_ACC_CODE AS AR_Code 
froM  	mobile_history mh, 
		CSS_TERM_GROUP_MOBILE_ID_MV mv, 
		mobile m, 
		cSCS_NLR_TERMINAL_GROUPS@DBLINK_CSS_CSSRO tg, 
		cSCS_NLR_company_CONTRACTS@DBLINK_CSS_CSSRO cc, 
		CSCS_SALES_SUPPORT_MANAGERS@DBLINK_CSS_CSSRO ssm1, 
		CSS_TERMINAL_GROUPS_V tgv,
		custsrvs cs,
		cSCS_SALES_SUPPORT_MANAGERS@DBLINK_CSS_CSSRO ssm2  
WHERE 	SYSDATE BETWEEN sdate AND edate 
		--and mv.END_DATE is null
		AND inmarsat_imn = m.mobile_id 
		AND mh.mobile_id = m.mobile_id 
		AND mv.TERMINAL_GROUP_CODE = tg.TERMINAL_GROUP_CODE
		and tg.TERMINAL_GROUP_CODE = tgv.TERMINAL_GROUP_CODE 
		and mh.MOBILE_Id = mv.INMARSAT_IMN	
		AND CS.CUSTOMER_CODE = MH.CUSTOMER_CODE (+) 				 
		and ssm1.SUPPORT_MANAGER_ID=tg.SALES_SUPPORT_ID
		and ssm2.SUPPORT_MANAGER_ID=tg.SALES_SUPPORT_MANAGER_ID
		AND mh.MOBILE_ID IN ('463790738')
GROUP BY mh.mobile_id, 
 	    mv.INMARSAT_ISN, 
	    mh.CUSTOMER_CODE, 
	    mh.SDATE, 
	    to_char(mh.EDATE, 'DD/MM/YYYY'), 
	    SSM2.FIRST_name || ' ' || ssm2.last_name , 
		mv.terminal_group_code, 
		tg.terminal_group_name ,
		tgv.contract_code ,
		cs.AGENT_S_ACC_CODE 
				

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Author Comment

by:Rhonda Carroll
ID: 22677134
That worked great! But why did it need the max function and the group by?

R
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Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 22677143
because  CASE WHEN mv.end_date is null THEN 'Yes' ELSE 'No' END) Terminal_Group_Active  must have returned 2 distinct values...
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Author Closing Comment

by:Rhonda Carroll
ID: 31504358
Thanks again for your help!!
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