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SQL string from 3 cases

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Last Modified: 2012-05-11
I have a function that is working and builds a string that is returned

What I need is to build a string that reads

'Error: Invalid '  And whichever variable or variables are = 'N'

Example...If all are invalid or = 'N'

@Output = 'Invalid or missing policyNumber,  IssuerName, CADate'

If ONLY CADate is invalid
@Output = 'Invalid or missing CADate'

ALTER FUNCTION [dbo].[uf_ucc_structured_WithCA] (@DealID int) 

RETURNS VARCHAR(8000)
AS
BEGIN
	Declare @policyNumber varchar(40)
	Declare @IssuerName varchar(100)
	Declare @CADate varchar(30)
	Select	@policyNumber = x.AnnnuitantPolicyNumber,
			@IssuerName   = x.IssuerName,
			@CADate		  = x.EventDate	   
			From	( Select IsNull(pd.AnnuitantPolicyNumber,'N') AnnnuitantPolicyNumber
						,IsNull(i.IssuerName, 'N') IssuerName
						,case when pe.[EventData] is null then 'N' else dbo.FormatDateTime(pe.[EventData], 'STANDARD') end eventDate
						 from crmprod_01.dbo.P_Deals pd 
								left join proc_ss.dbo.p_issuers i on pd.IssuerID = i.IssuerID
								left join crmprod_01.dbo.p_Events_Table pe on (pd.DealID = pe.dealID  and pe.EventTypeID = 84)
								where pd.DealID =@dealID) x
	DECLARE @Output VARCHAR(8000)
		SET		@Output =	@policyNumber + ' , ' + @IssuerName + ' , ' + @CADate
	RETURN @Output
END

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