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Relationship queries involve at least two objects, a parent and a child. These queries are used to fetch data either from the Parent object, when SOQL query is written on child, or from child object when SOQL query is written on parent.
SELECT relationship_field.parent_obj_field FROM child_object;
List<Opportunity> oppList = [SELECT name, amount, closeDate, account.name
for(Opportunity o: oppList)
System.debug(‘Opp: ‘ + o.name + ‘ Acc: ‘+o.account.name);
SELECT (relationship_field)__r.parent_obj_field FROM child_object;
List<Branch__c> branchList = [select Branch_ID__c, State__c,
Branch_of_Bank__r.Bank_Name__c from Branch__c];
for(Branch__c bl: branchList)
System.debug(‘Bank Name: ‘+bl.Branch_of_Bank__r.Bank_Name__c
+ ‘Branch: ‘+bl.State__c);
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