how to update or delet from database

I am new to database i just created a simple database .please let me know how to delete a single row from this data base and how to edit a single row from this database :) thanks in advance

  void createDatabase(String time, String day,String course,String room,String syl){

       database = openOrCreateDatabase("newDb",MODE_PRIVATE, null);


         sql = "CREATE TABLE IF NOT EXISTS examTab (Time VARCHAR ,Day VARCHAR ,Course VARCHAR ,Room VARCHAR ,Syl VARCHAR );"; 
         c = database.rawQuery(sql, null);

        database.execSQL(sql);


    String insertSql = "INSERT INTO examTab VALUES('"+time+"','"+day+"','"+course+"','"+room+"','"+syl+"');";
    database.execSQL(insertSql);


    database.close();


}