oracle清空所有表数据

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/* DBMS name:   ORACLE Version 10g              */ 
/* Created on:   2013/8/16 14:30:03              */ 
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alter table Da_pic 
  drop constraint FK_DA_PIC_REFERENCE_DA_PICSU; 
 
drop table Da_pic cascade constraints; 
 
drop table Da_picsubject cascade constraints; 
 
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/* Table: Da_pic                        */ 
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create table Da_pic ( 
  ID          VARCHAR2(200)          not null, 
  no          VARCHAR2(200), 
  subjiectid      VARCHAR2(200), 
  Name         VARCHAR2(400), 
  UploadTime      DATE, 
  UserId        VARCHAR2(200), 
  picdate       DATE, 
  place        VARCHAR2(200), 
  people        VARCHAR2(200), 
  event        VARCHAR2(200), 
  background      VARCHAR2(200), 
  cameramen      VARCHAR2(200), 
  serial        INTEGER, 
  IsEffect       VARCHAR2(200), 
  constraint PK_DA_PIC primary key (ID) 
); 
 
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/* Table: Da_picsubject                     */ 
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create table Da_picsubject ( 
  ID          VARCHAR2(200)          not null, 
  no          VARCHAR2(200), 
  title        VARCHAR2(200), 
  year         VARCHAR2(200), 
  type         VARCHAR2(200), 
  gdtime        DATE, 
  iseffect       VARCHAR2(200), 
  seiral        INTEGER, 
  constraint PK_DA_PICSUBJECT primary key (ID) 
); 
 
alter table Da_pic 
  add constraint FK_DA_PIC_REFERENCE_DA_PICSU foreign key (subjiectid) 
   references Da_picsubject (ID);