多选题Given:
1. import java.util.*;
2. public class Garage {
3. public static void main(String[] args) {
4. Map＜String, String＞ hm = new HashMap＜String, String＞();
5. String[] k = {null, "2", "3", null, "5"};
6. String[] v = {"a", "b", "c", "d", "e"};
7.
8. for(int i=0; i＜5; i++) {
9. hm.put (k[i], v[i]);
10. System.out.print(hm.get(k[i]) + " ");
11. }
12. System.out.print(hm.size() + " " + hm.values() + "/n");
13. } }
What result is most likely?
多选题请看如下的创建视图PARTS_VIEW的DDL语句： CREATE OR REPLACE parts_view AS SELECT manufacturer_id, COUNT (part_id) TOTAL_PARTS FROM parts GROUP BY manufacturer_id; 基于以上PARTS_VIEW视图，可以使用如下哪个SQL语句? A．SELECT * FROM parts_view; B．UPDATE parts_view SET total_parts=10000 WHERE manufacturer_id=3983; C．DELETE FROM parts_view WHERE manufacturer_id=340394; D．INSERT INTO parts_view VALUES (89485, 1009);
多选题下面哪些条件将阻止使用备份恢复表或者表分区?
多选题Given that the working directory is bigApp, and the following directory structure:
bigApp
|-- classes
| |-- com
| |-- wickedlysmart
|-- source
|-- com
|-- wickedlysmart
|-- BigAppClass2.java
And the code:
1. public class BigAppClass2 {int doMore() {return 17; } }
And the following command-line invocations:
Ⅰ. javac -d source/com/wickedlysmart/BigAppClass2.java
Ⅱ. javac -d classes source/com/wickedlysmart/BigAppClass2.java
Ⅲ. javac -d classes/com/wickedlysmart source/com/wickedlysmart/ BigAppClass2. java
Which are true? (Choose all that apply.)
多选题请问“START superdog”这个SQL*Plus命令将完成以下的哪项工作?
多选题以下是PRODUCT(产品)表和SUPPLIER(供应商)表的结构： PRODUCT PRODUCT_ID NUMBER NOT NULL, Primary Key PRODUCT_NAME VARCHAR2(25) SUPPLIER_ID NUMBER Foreign key to SUPPLIER ID of the SUPPLIER table LIST_PRICE NUMBER(7, 2) COST NUMBER(7, 2) QTY_IN_STOCK NUMBER QTY_ON_ORDER NUMBER REORDER_LEVEL NUMBER REORDER_QTY NUMBER SUPPLIER SUPPLIER_ID NUHBER NOT NULL, Primary Key SUPPLIER_NAME VARCHAR2(25) ADDRESS VARCHAR2(30) CITY VARCHAR2(25) REGION VARCHAR2(10) POSTAL_CODE VARCHAR2(11) 评估如下的SQL语句，请问这个语句将完成以下的哪个任务? ALTER TABLE product DISABLE CONSTRAINT supplier_id_fk; A．删除PRODUCT表上的外键约束 B．关闭PRODUCT表上的外键约束 C．移除在PRODUCT表中的SUPPLIER_ID列的任何约束引用 D．关闭在PRODUCT表中的SUPPLIER_ID列的任何完整性约束
多选题Given:
3. public class Stubborn implements Runnable {
4. static Thread t1;
5. static int x = 5;
6. public void run() {
7. if(Thread.currentThread() .getId() == t1.getId()) shove();
8. else push();
9. }
10. static synchronized void push() {shove(); }
11. static void shove() {
12. synchronized (Stubborn. class) {
13. System.out.print(x-- + " ");
14. try {Thread.sleep(2000); } catch (Exception e) { ; }
15. if(x ＞ 0) push();
16. } }
17. public static void main(String[] args) {
18. t1 = new Thread(new Stubborn());
19. t1.start();
20. new Thread(new Stubborn()) .start();
21. } }
Which are true? (Choose all that apply.)
多选题Given:
1. import java.util.*;
2. public class Drunken {
3. public static void main(String[] args) {
4. Set＜Stuff＞ s = new HashSet＜Stuff＞();
5. s.add(new Stuff(3)); s.add(new Stuff (4)); s.add(new Stuff(4));
6. s.add(new Stuff(5)); s.add(new Stuff(6));
7. s = null;
8. // do more stuff
9. }
10. }
11. class Stuff {
12. int value;
13. Stuff(int v) {value = v; }
14. }
When line 8 is reached, how many objects are eligible for garbage collection?
多选题普通还原点和担保还原点有什么区别?
多选题以下哪种SHUTDOWN模式将在所有的用户终止会话之前只等当前用户正在进行(目前挂起)的交易结束? A．ABORT B．NORMAL C．IMMEDIATE D．TRANSACTIONAL
多选题Given:
2. import java.util.*;
3. public class Vinegar {
4. public static void main(String[] args) {
5. Set＜Integer＞ mySet = new HashSet＜Integer＞();
6. do1 (mySet, "0"); do1 (mySet, "a");
7. do2 (mySet, "0"); do2 (mySet, "a");
8. }
9. public static void do1 (Set s, String st) {
10. s.add (st);
11. s.add(Integer.parseInt (st));
12. }
13. public static void do2(Set＜Integer＞ s, String st)
14. s.add (st);
15. s.add(Integer.parseInt (st));
16. } }
Which are true? (Choose all that apply.)
多选题你刚才收到一条警报，指出快速恢复区的可用空间低于3%。可以查询哪个视图和列来了解可能的纠正空间问题的措施?
多选题作为一位称职的数据库管理员，如果不想让数据库用户查询数据字典中的数据，请问应该采取以下的哪一个措施来达到目的? A．将参数COMPATIBLE设置为FALSE B．将SELECT ANY TABLE系统权限从用户那收回 C．将参数REMOTE_LOGIN_PASSWORDFILE设置为NONE D．将参数REMOTE_LOGIN_PASSWORDFILE设置为EXCLUSIVE E．将参数O7_DICTIONARY_ACCESSIBILITY设置为FALSE F．将参数O7_DICTIONARY_ACCESSIBILITY设置为TRUE
多选题外连接(Outer Join)符号应放在外连接条件的哪一边? A．有匹配数据行的一边 B．没有匹配数据行的一边 C．放在连接条件的两边 D．连接条件的哪一边都不放
多选题如要将价格(price)限制为100及以下，应使用如下子句中的哪一个?
多选题Given:
51. String s = "4.5x4.a.3";
52. String[] tokens = s.split("//s");
53. for(String o: tokens)
54. System.out.print (o + " ");
55.
56. System.out.print(" ");
57. tokens = s.split("//..");
58. for(String o: tokens)
59. System.out.print(o + " ");
What is the result?
多选题下面是INVENTORY(库存)表中所存储的数据：评估如下的SQL语句，请问哪一个id_number的数据行将被删掉?DELETEFROMinventoryWHEREorder_date＞TO_DATE("25.07.1997","DD.MM.YYYY");
多选题为闪回版本查询使用VERSIONS BETWEEN子句时，无法使用哪项来限制查询返回的行数?
多选题可以在以下的哪两个语句中使用ENABLE子句? A．ALTER VIEW B．ALTER TABLE C．CREATE VIEW D．CREATE TABLE E．CREATE INDEX F．CREATE SEQUENCE
多选题以下是客户(CUSTOMER)表和客户_订单(CURR_ORDER)表的结构： CUSTOMER ------------------------------------ CUSTOMER_ID NUMBER(5) NAME VARCHAR2(25) CREDIT_LIMIT NUMBER(8, 2) ACCT_OPEN_DATE DATE CURR_ORDER ------------------------------------ ORDER_ID NUMBER(5) CUSTOMER_ID NUMBER(5) ORDER_DATE DATE TOTAL NUMBER(8, 2) 以下哪种情况下应该使用子查询来返回所需的结果? A．需要显示今天下了订单的全部客户的名字 B．需要确定CUSTOMER_ID为30450的客户今年所下的订单数量 C．需要确定今年开了账号的所有客户的平均信用限额(CREDIT_LIMIT) D．需要确定那些信用限额比CUSTOMER_ID为30450的客户的信用限额高(大)的客户