摘要：1 public class A{ 2 public static void main(String []args){ 3 4 A.sayHi(); 5 A a= new A(); 6 boy.lookMe(); 7 } 8 private static String sayHi()//静态方法 9 阅读全文

摘要：内连接 INNER JOIN来实现 SELECT s.id, s.name, s.class_id, c.name class_name, s.gender, s.score FROM students s INNER JOIN classes c ON s.class_id = c.id; 注意I 阅读全文