I have to bring the values of a multiple child object of a Parent object in single query,
I tried the following method , however for query one child object as a first step it throws me the following error:
Error: "Didn't understand relationship 'OrderTraining__r' in FROM part of query call. If you are attempting to use a custom relationship, be sure to append the '__r' after the custom relationship name. Please reference your WSDL or the describe call for the appropriate names."
the query is
newOrders = [select id,OrderNumber,(select Name__c from OrderTraining__r) from Order];