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ALTER Function [InvestmentReturn].[getSecurityMinLowForPeriod](@securityid int,
    @start datetime,
    @end datetime)
returns xml
begin

declare @results varchar(500)
declare @low int
declare @adjustedLow int
declare @day varchar(10)

if @end is null
begin
    set @end = getdate()
end
set @adjustedLow = (select min(adjLow) 
                        from (
                            select Low * [InvestmentReturn].[fn_getCorporateActionSplitFactor](isq.securityid, @start, convert(varchar,day, 111)) as adjLow 
                            from 
                                securityquote isq
                            where isq.securityid = @securityid and isq.day >= convert(varchar(10), @start, 111) and convert(varchar(10), @end, 111) >= isq.day
                            and low != -1 
                            ) as x)
select 
    top 1 @low …