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Sakthivel Thandavarayan
How to limit rows in sub query on aggregate result ?
Hi,
I've custom object called csatsurvey__c and have a lookup field contact__c
Multiple surveys can be tied to single contact. I want to calculate average of survey field(numberic) and update it on contact field.
Below query works fine in the trigger,
If I query on contact object I cannot use aggregate function on sub query, getting error - only root queries support aggregate expressions
Whats the best way to achive it?
I've custom object called csatsurvey__c and have a lookup field contact__c
Multiple surveys can be tied to single contact. I want to calculate average of survey field(numberic) and update it on contact field.
Below query works fine in the trigger,
select contact__c Id,avg(Client_Service_Overall_Satisfaction__c) overallAverage FROM CSATSurvey__c WHERE contact__c!=null and contact__c in :contactids group by contact__chowever it calculates average of all available related records. I want to include only most recent 5 surveys in calculation. I cannot limit here in the above query as it limits actual aggregate result.
If I query on contact object I cannot use aggregate function on sub query, getting error - only root queries support aggregate expressions
SELECT ID, (Select Id, avg(Client_Service_Overall_Satisfaction__c) from CSATSurveys order by createddate desc LIMIT 5) from Contact Where ID in contactIds
Whats the best way to achive it?
You can't use a LIMIT clause in a query that uses an aggregate function, but does not use a GROUP BY clause.
Since you don't want to group... you can't use LIMIT like that.
Please refer below link where you have the solution for the similar scenario.
http://salesforce.stackexchange.com/questions/122226/aggregate-values-with-limits-and-orders
Hope this helps you!
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Thanks and Regards
Sandhya