Help Desk Ticket Reference: https://c.na7.visual.force.com/apex/Case_View?id=500A0000007Bnqm
project_key: SOA

Salesforce.com SOQL supports selecting parent record value through reference key name.

We need to query parent record info from child table query.   For example,  if I have column parentid in Contact object which is reference key to account object,  I can do in SOQL in salesforce.com something like this.

Select c.Id, c.Name, c.AccountId, c.Account.Name
from Contact c

But if i want to do the same in EDS, I have to use Relationship Queries (join of two tables Account and Contact) which is huge impact on performance