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ÎÒÏë×î³õѧϰÊý¾Ý¿âʱ¶¼ÊÇÒÔstudent±í¡¢course±íºÍsc±íΪÀýµÄ°É
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»·¾³£ºoracle 10g
declare
  vcnt number;
begin
  select count(*) into vcnt from user_tables where table_name='SC';
  If vcnt = 1 Then
    Execute immediate 'drop table sc';
  end if;
  select count(*) into vcnt from user_tables where table_name='STUDENT';
  If vcnt = 1 Then
    Execute immediate 'drop table student';
  end if;
  select count(*) into vcnt from user_tables where table_name='COURSE';
  If vcnt = 1 Then
    Execute immediate 'drop table course';
  end if;
end;
/
--´´½¨±í
Create table student
(sno char(10) primary key,
 sname varchar(20) not null,
 sage smallint,
 ssex char(2),
 sdept varchar(20));
Create table course
(cno char(10) primary key,
 cname varchar(20) not null,
 credit smallint);
Create table sc
(sno char(10),
 cno char(10),
 grade smallint,
 primary key(sno,cno));
--Ïò±íÖвåÈëÊý¾Ý
insert into student values('001','¸ðÁé','19','f','MA');
insert into student values('002','ÔÀÁÖÔÂ','25','f','MA');
insert into student values('003','¼§Ê¤¿¡','16','f','CS');
insert into student values('004','ÂíÔ´','20','f','MA');
insert into student values('005','ÎÌÓ¡','23','m','C');
insert into course values('C01','CÓïÑÔ','4');
insert into course values('C02','Êýѧ','4');
insert into course values('C03','Ó¢Óï','2');
insert into course values('C04','¼ÆËã»ú','5');
insert into course values('C05','Êý×Öµç·','3');
insert into course values('C06','Êý¾Ý¿â','2');
--001ºÅѧÉúÑ¡Ð޿γÌ
insert into sc values('001','C05','75');
insert into sc values('001','C01','68');
insert into sc values('001','C03','86');
insert into sc values('001','C02','40');
insert into sc values('001','C04','97');
--002ºÅѧÉúÑ¡Ð޿γÌ
insert into sc values('002','C01','60');
insert into sc values('002','


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create or replace type mytype IS TABLE OF varchar2(20);
declare type1 mytype :=mytype('1','2','3','4');
i number:=1;
var_str varchar(20):='liaomin';
begin
type1.EXTEND;
type1(type1.COUNT):=var_str;
loop
  dbms_output.put_line(type1(i));
  i:=i+1;
  exit when i=type1.count+1; ......

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1¡¢¹Ø±ÕÊý¾Ý¿â >>shutdown immediate;
2¡¢¿½±´Îļþ£¨*.dbf)µ½Ä¿µÄÎļþ¼Ð;
3¡¢Æô¶¯Êý¾Ý¿â >>startup mount;
4¡¢¸ü¸Ä·¾¶
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>>alter database rename file 'C:\oracle\oradata\global\UNDOTBS ......
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