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Brian NolauBrian Nolau 

SOQL for Custom Objects with custom Fields in Master-Detail Relationship vs. SOQL for Custom Objects in Lookup Relationship

Im currently reading "Getting Started with SOQL" and the entirety of Google. Salesforce's SOQL documentation for this scenario is exhuastingly bad I've been trying to figure out this embarassingly easy topic for like 5 hours now and all official sources are terrible. 
ShirishaShirisha (Salesforce Developers) 
Hi Brian,


There is no difference when you are trying to refer the child Objects in the SOQL query but there is difference between in the Standard and Custom Object relationships.


Kindly mark it as best answer if it helps so that it can help others in the future.

Warm Regards,
Shirisha Pathuri