trigger EmployeeInformationTrigger on Employe_Infrmation__c (before delete) {
        
            Map<Id,Employe_Infrmation__c> naMap = new Map<Id,Employe_Infrmation__c>([SELECT Id,DepartMt__r.Id FROM 
                
                Employe_Infrmation__c where Id in:trigger.oldMap.keyset()]);
        
                     for(Employe_Infrmation__c se:trigger.old){
                     
                     if (naMap.get(se.Id).DepartMt__r.Id.size()>0)
                     
                     se.addError('jjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj');
                     }