//ERROR 1
Expecting '}' but was: 'upsert'


//ERROR 2
Class VolumeMarketBatch must implement the method: void Database.Batchable<SObject>.finish(Database.BatchableContext)



//LATEST APEX CODE in SANDBOX

global with sharing class VolumeMarketBatch implements Database.Batchable<sObject> {
    
    global Database.QueryLocator start(Database.BatchableContext info) {
        
        // Go through and get the list of volume market that has changed
        String returnQuery = 'select Id, Remodeler_Account__c, Postal_Code__c ' +
            '	from Zip_Assignment__c ' +  
            '	where Postal_Code__r.Volume_Market_Update__c = true';
        
        return Database.getQueryLocator(returnQuery); 
    }
    
    global void execute(Database.BatchableContext info, List<sObject> sobjectList) {
        // Gets the account and postal codes that have changed
        List<Id> accountIdList = new List<Id>();
        List<Id> pcIdList = new List<Id>();
        for (sObject obj : sobjectList) {
            Zip_Assignment__c zipAssign = (Zip_Assignment__c) obj;
            accountIdList.add(zipAssign.Remodeler_Account__c);
            pcIdList.add(zipAssign.Postal_Code__c);
        }
        
        // Goes through the accounts and postal codes that have changed and sets the Volume Market field on the account
        //Map<Id, Account> accountList = new Map<Id, Account>([select Id, Volume_Market__c 
        //	from fromAccount where Id = : accountIdList]);
        Map<Id, Account> accountList = new Map<Id, Account>([select Id, Volume_Market__c 
                                                             from Account where Id = : accountIdList]); // modified from
        
        Map<Id, Postal_Code__c> pcList = new Map<Id, Postal_Code__c>([select Id, Volume_Market_Update__c, Volume_Market__c from Postal_Code__c where Id = : pcIdList]);
        
        for (sObject obj : sobjectList) {
            Zip_Assignment__c zipAssign = (Zip_Assignment__c) obj;
            if (zipAssign.Remodeler_Account__c != null) {
                accountIdList.add(zipAssign.Remodeler_Account__c);
                pcIdList.add(zipAssign.Postal_Code__c);
            }
        }
        Account a = accountList.get(zipAssign.Remodeler_Account__c);
        Postal_Code__c pc = pcList.get(zipAssign.Postal_Code__c);
        //System.Debug(pc.Volume_Market__c + a.Volume_Market__c);
        if (pc != anull) { 
            if (pc.Volume_Market__c != null) {
                a.Volume_Market__c = pc.Volume_Market__c;
            }
            pc.Volume_Market_Update__c = false;
        }
    }
    
    // updates both account and postal codes
    upsert accountList.values();
    upsert pcList.values();
}

global void finish(Database.BatchableContext info) {
	}
}