Question

I’m trying to query a database, with the cfml(sql) statement below, but I want to be able to get results for each stat_instance from an array, the last line contains the loop, which I think should generate a query per value from the array

select 
    <cfif monthCrossover>
        statsMinEnd2 + 
    </cfif> 
    stats_min as time_stamp, 
    <cfif structKeyExists(avgThis, arguments.key)>
        avg
    <cfelse>
        sum
    </cfif>
    (stats_value) as stats_value 
from stats_kv_table_201207 
where 
    <cfif dayStart == dayEnd>
        stats_day = <cfqueryparam value="#dayStart#">
    <cfelse> 
        stats_day >= <cfqueryparam value="#dayStart#"> 
        and stats_day <= <cfqueryparam value="#dayEnd#">
    </cfif>
    and stats_min >= <cfqueryparam value="#statsMinStart1#"> and stats_min <= <cfqueryparam value="#statsMinEnd1#">
    and stats_component = <cfqueryparam value="#arguments.component#">
    <cfset instanceList = ListToArray(arguments.instance)>
    <cfif ArrayLen(instanceList) EQ 1>
        and stats_instance = <cfqueryparam value="#arguments.instance#">
    </cfif>
    <cfif ArrayLen(instanceList) GT 1>
        and stats_instance IN (<cfqueryparam value="#arguments.instance#" list="yes"/>)
    </cfif>
    <cfif ArrayLen(instanceList) GT 1 and ArrayContains(instanceList, "multi")>
        <cfloop index = "i" from="1" to="#arrayLen(instanceList)#"  array =#instanceList#> 
            <cfset stats_instance = <cfqueryparam value= #instanceList[i]#>
        </cfloop>
    </cfif>

Answer 1

If I understand your question correctly, you probably need to use GROUP BY clause in your query to group your sum/avg values by stats_instance. Something like this:

SELECT stats_instance, ...
FROM ...
WHERE
... 
<cfif len(trim(arguments.instance))>
AND stats_instance IN (<cfqueryparam value="#arguments.instance#" list="yes"/>)
</cfif>
GROUP BY stats_instance
ORDER BY stats_instance

NOTE: syntax may be different depending on your database engine.