Java JDBC程序从表中获取特定行时抛出SQL语法错误

我有一个名为“飞机”的数据库，里面有一个名为“时间表”的表。timeatable表有一个文本类型为fromcity的列

                    Connection conn0=null;
                    PreparedStatement st0=null;
                    String sql0="SELECT FROM timetable where fromcity=?";

                try{
                        Class.forName("com.mysql.jdbc.Driver");
                        conn0=DriverManager.getConnection(DB_URL,USER,PASS);
                        st0=conn0.prepareStatement(sql0);
                        st0.setString(1,city[i]);
                        ResultSet rs0=st0.executeQuery();

                        if(rs0.next())
                        {
                            System.out.println("flight exists");
                        }

                        else
                        {
                            System.out.println("fight does not exist");
                        }


                    }
                    catch(Exception et)
                    {
                        System.out.println("Error"+et.getMessage());
                    }

我得到一个错误：

为什么我会犯这个错误

You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'FROM timetable where fromcity='1'' at line 1

---

您忘记在查询中写入列名

成功了

SELECT * FROM timetable where fromcity=?"

而不是

SELECT FROM timetable where fromcity=?"