神州数码试题
神州数码试题
1)Which statement shows the maximum salary paid in each job category of each department?_______
A. select dept_id, job_cat,max(salary) from employees where salary > max(salary);
B. select dept_id, job_cat,max(salary) from employees group by dept_id,job_cat;
C. select dept_id, job_cat,max(salary) from employees;
D. select dept_id, job_cat,max(salary) from employees group by dept_id;
E. select dept_id, job_cat,max(salary) from employees group by dept_id,job_cat,salary;
2)description of the students table:
sid_id number
start_date date
end_date date
which two function are valid on the start_date column?_________。
A.sum(start_date)
B.avg(start_date)
C.count(start_date)
D.avg(start_date,end_date)
E.min(start_date)
F.maximum(start_date)
3)for which two constraints does the oracle server implicitly create a unique index?______。
A. not null
B. primary
C. foreign key
D. check
E. unique
4)in a select statement that includes a where clause,where is the group by clause placed in the select statement?______。
A. immediately after the select clause
B. before the where clause
C. before the from clause
D. after the order by clause
E. after the where clause
5)in a select statement that includes a where clause,where is the order by clause placed in the select statement?______.
A.immediately after the select clause
B.before the where clause
C.after all clause
D.after the where clause
E.before the from clause
6)evaluate there two sql statements______.
Select last_name,salary from employees order by salary;
Select last_name,salary from employees order by 2 asc;
A.the same result B.different result C.the second statement returns a syntax error
7) you would like to display the system date in the format“20051110 14：44：17”。Which select statement should you use?______。
A. select to_date(sydate,’yearmmdd hh:mm:ss’)from dual;
B. select to_char(sydate,’yearmonthday hh:mi:ss’)from dual;
C. select to_date(sydate,’yyyymmdd hh24:mi:ss’)from dual;
D. select to_char(sydate,’yyyymmdd hh24:mi:ss’)from dual;
E. select to_char(sydate,’yy-mm-dd hh24:mi:ss’)from dual;
8)which select statement will the result ‘ello world’from the string‘Hello world’?______.
A. select substr(‘Hello World’,1)from dual;
B. select substr(trim(‘Hello World’,1,1))from dual;
C. select lower(substr(‘Hello World’,1))from dual;
D. select lower(trim(‘H’from‘Hello World’))from dual;
9)which are DML statements(choose all that apply)______.
A.commit B.merge C.update D.delete E.creat F.drop
10)Select 语句中用来连接字符串的符号是______.
DA. “+” B. “&” C.“||” D.“|”
问答题： 什么是聚集索引，什么是非聚集索引，什么又是主键？
不断更新中。。。。
2.下面程序运行会发生什么结果?如果有错误,如何改正? (15分)
int x = 0;
}
int x =1;
}
class C extends B implements A {
public void pX(){
System.out.println(x);
}
public static void main(String[] args) {
new C().pX();
}
}
3.简述 Java Server Page 和 Servlet 的联系和区别。(20分)
4.XML文档定义有几种形式？它们之间有何本质区别？ t8OW^0l7D
解析XML文档有哪几种方式？(20分) 面试技巧，面经e0`%n:} C)Z
5.简述synchronized和java.util.concurrent.locks.Lock的异同 ？(15分）