Hi,
Its been very difficult for me even after working for a while in CRM,i am not able to understand what is the exact difference between Query Expression and FetchXML.
Confusion is here
Some says you cant retrieve the related entity column in Query expression but this link(https://msdn.microsoft.com/en-us/library/gg328149(v=crm.5).aspx) proved it wrong.
Some says you cant put related entity column in filter condition.
Other differences i know is
1)Queryexpression Retrival record limit is 5K and FetchXML have 10K.
2)Cant use aggregation in Query expression but in FetchXML you can use it.
Just would like to you what is the exact difference from technical prospective.
Ayaz