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How to access child object 2,3 level down in Trigger


I am fairly new to salesforce. I was working with triggers and would like to know how I can access a child object two three levels deep in a trigger. e.g. the trigger is for Object A and it has child B which has child C , now I want to access object C's fields in the Object A trigger.


Best Answer chosen by Admin (Salesforce Developers) 

You'll have to get into SOQL there


SELECT Id FROM childB where objecta = objectA.Id

SELECT Id FROM ChildC where childb = childb.Id