For(Course__c course1 : lstTarget){
                Course__c course2 = new Course__c ();
                course2 = course1.clone(false,false,false,false);
                course2.Specialisation_Code__c = '';
                course2.Specialisation__c = '';
                course2.Course_Code__c = course1.Name;
                newLstTarget.add(course2);
                system.debug('newLstTarget' + newLstTarget.size());
            }
            Map<String,Course__c> extIdMap1 = new Map<String,Course__c>();
            for(Course__c so1 : newLstTarget){
                extIdMap1.put((String)so1.get('Course_Code__c'),so1);
            }
            Set<String> extIdSet1 = extIdMap1.keyset();
            String splitQuery1 = 'SELECT Id,Course_Code__c FROM Course__c WHERE Course_Code__c in :extIdSet1';
            system.debug(splitQuery1);
            List<Course__c> insertlstTarget = new List<Course__c>();
            Map<Id,Course__c> updateMap1 = new Map<Id,Course__c>();
            Map<String,Id> queryMap1 = new Map<String,Id>();
            for(Course__c so1 : database.query(splitquery1)){
                queryMap1.put((String)so1.get('Course_Code__c'), so1.Id);
            }
            for(Course__c so1 : newLstTarget){
                Id theId = queryMap1.get((String)so1.get('Course_Code__c'));
                if(theId != null){
                    so1.Id = theId;
                    updateMap1.put(theId,so1);
                }
                else{
                    insertlstTarget.add(so1);
                }
            }