3

Group__c has a lookup relationship to Account. What should be the query to fetch the number of Account records which have more then N Group__c child records?

N can be anything like 3,5 etc.

7

You can use the HAVING clause and an aggregate query:

Integer matchingAccounts = [
    SELECT count(Id) records, Account__c FROM Group__c
    GROUP BY Account__c HAVING count(Id) > :numberOfChildren
].size();

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