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STEP 2
cntrl+E(Anonymisis Window)==>PASTE BELOW CODE
Batch1 be=new Batch1();
Database.executeBatch(be);


STEP 1)PASTE BELOW CODE

global class Batch1 implements Database.Batchable<Sobject>{
 
    //Method to get the data to be proceesed  
    global database.Querylocator Start(Database.BatchableContext bc){
        String query = 'Select Id, Name,Rating  From Account ';
        return Database.getQueryLocator(query);
    }
 
 
    //Method to execute the batch
    global void execute(Database.BatchableContext bc, List<Account> scope){
       
        for(Account a : scope){
       a.Rating ='Warm';
            
        }
         update scope;
    }
 
    //Method to be called after the excute
    global void finish(Database.BatchableContext bc){
       
        AsyncApexJob jb=[SELECT CompletedDate,JobItemsProcessed,JobType,LastProcessed,NumberOfErrors,ParentJobId,Status,TotalJobItems FROM AsyncApexJob where id=:bc.getJobId()];
        Messaging.SingleEmailMessage msg=new Messaging.SingleEmailMessage();
        String[] toadd=new String[]{'YOUREMAILID@gmail.com'};//YOU CAN GIVE ANY EMAIL ID HERE
            msg.setToAddresses(toadd);
        String body='Dear Admin,<br/>Batch Operation Of JobId:<b>'+jb.id;
        body=body+'</b><br/><br/>Processes Successfully<br/>Total JobItems:<b>'+jb.TotalJobItems;
        body=body+'</b><br/><br/>No of Errors :<b>'+jb.NumberOfErrors+'</b>';
        msg.setSubject('Batch Status');
        msg.setHtmlbody(body);
        Messaging.Email[] emails=new Messaging.Email[]{msg};
        Messaging.sendEmail(emails);

        //Add your start code for the other batch job here
        //Database.executeBatch(new Batch2());
       
    }
}