2020-11-13找到所有以Account为Master关系的

How to get list of Objects Master detail with account？ 这个问题未完待续
参考自：How to get list of Objects Master detail with account. 但下述这个方法拿到的是系统内的所有Object，需要自己做一遍筛选。
PS: 即使是Lookup关系，isCascadeDelete 字段为true的时候，在Account删除时，该Object也是会被删除的

//this example describes the Account sObject
    Schema.DescribeSObjectResult R = Account.SObjectType.getDescribe(); //the master object. In this scenario it is Account
    List<Schema.ChildRelationship> C = R.getChildRelationships();
    Set<Schema.SObjectType> childNameList = new Set<Schema.SObjectType>();
    Integer countDetailObjectsRelatedToMaster= 0; 
    String childName;
    for( Schema.ChildRelationship sc :c){
        if(sc.isCascadeDelete()){ //this means it is master-detail
            if (sc.getRelationshipName() != null){
                countDetailObjectsRelatedToMaster++;  
                System.debug('getChildSObject: ' + sc.getChildSObject());
                System.debug('getField: ' + sc.getField());
                System.debug('getRelationshipName: ' + sc.getRelationshipName());
                System.debug('isRestrictedDelete(): ' + sc.isRestrictedDelete());
            }
    }
    }
    System.debug('countDetailObjectsRelatedToMaster: '+countDetailObjectsRelatedToMaster);

附上另一篇文章：Guidelines for Deleting Accounts
对于Lookup字段，我们目前有2个选项，如果想Enable Cascade Delete需要联系Salesforce启用，默认是Disable的，参考下图：