oracle PLSQL程序造数据笔记

1.造假数据：

 1 declare
 2   type t_website_id is table of number(10);
 3   type t_website_name is table of varchar2(20);
 4   type t_area_id_tb is table of varchar2(5);
 5   type t_area_name_tb is table of varchar2(16);
 6   website_id  t_website_id :=t_website_id(1001,1002,1003,1004,1005,1006,1007,1008,1009,1010);
 7   website_name  t_website_name :=t_website_name(‘LOFT‘,‘京东‘,‘网易‘,‘知乎‘,‘搜狐‘,‘新浪‘,‘淘宝‘,‘腾讯‘,‘百度‘,‘人人‘);
 8   area_id_tb        t_area_id_tb := t_area_id_tb(‘55‘,‘551‘,‘553‘,‘559‘,‘556‘,‘562‘,‘564‘,‘554‘,‘561‘,‘557‘,‘5581‘);
 9   area_name_tb  t_area_name_tb := t_area_name_tb(‘安徽‘,‘合肥‘,‘芜湖‘,‘黄山‘,‘安庆‘,‘铜陵‘,‘六安‘,‘淮南‘,‘淮北‘,‘宿州‘,‘亳州‘);
10
11 begin
12   delete from TEST_WEBSITE_AREA_H;
13   for i in 0..23 loop
14      for j in area_id_tb.first .. area_id_tb.last loop
15         for k in website_id.FIRST .. website_id.LAST loop
16             insert into TEST_WEBSITE_AREA_H
17             (
18               time_id,
19               area_id,
20               area_name,
21               website_id,
22               website_name,
23               fst_screen_duration,
24               total_flow,
25               click_traffic
26             )
27             values(
28                to_char(sysdate,‘yyyyMMdd‘)||lpad(i,2,‘0‘)||‘00‘,
29                area_id_tb(j),
30                area_name_tb(j),
31                website_id(k),
32                website_name(k),
33                trunc(dbms_random.value(100, 800)),
34                round(dbms_random.value(1024, 9999999),2),
35                trunc(dbms_random.value(5000000,99999999))
36             );
37         end loop;
38      end loop;
39   end loop;
40 end;

2.随机取数据：

1 SELECT * FROM (
2     SELECT ename, job
3         FROM emp
4      ORDER BY DBMS_RANDOM.VALUE()
5   ) WHERE ROWNUM <= 5;

3.使用connect by 造数据：

 1 create table t_test_random as
 2 select level L1,
 3  substr(abs(dbms_random.random), 2, 8) L2,
 4  trunc(dbms_random.value(1, 101)) L3,
 5  (2 * trunc(dbms_random.value(1, 50)) - 1) L4,
 6  dbms_random.string(‘a‘, 10) L5,
 7  dbms_random.string(‘x‘, 10) L6,
 8  to_date(trunc(dbms_random.value(to_number(to_char(to_date(‘2012-10-1‘,
 9  ‘yyyy-mm-dd‘),
10  ‘j‘)),
11  to_number(to_char(to_date(‘2012-10-8‘,
12  ‘yyyy-mm-dd‘),
13  ‘j‘)))),
14  ‘j‘) +
15  dbms_random.value(9,18)/24 L7,
16  sysdate - dbms_random.value(0,30)/24/60 L8,
17  trunc(sysdate) - trunc(dbms_random.value(1,11)) L9
18  from dual
19  where level >= 100
20 connect by level <= 1000000;