ORACLE 使用DBMS_METADATA.GET_DDL获取DDL语句
Oracle 在9i以后,可以利用DBMS_METADATA.GET_DDL包得到数据库的对象的ddl脚本。如下(SQLPLUS中执行):
1. 获取单个的建表、视图和建索引的语法
set pagesize 0
set long 90000
set feedback off
set echo off
spool DEPT.sql
select dbms_metadata.get_ddl('TABLE','TAB_NAME','SCOTT') from dual;
select dbms_metadata.get_ddl('VIEW','VIEW_NAME','SCOTT') from dual;
select dbms_metadata.get_ddl('INDEX','IDX_NAME','SCOTT') from dual;
spool off;
2. 获取一个SCHEMA下的所有建表、视图和建索引的语法,以scott为例:
set pagesize 0
set long 90000
set feedback off
set echo off
spool schema.sql
connect scott/tiger;
SELECT DBMS_METADATA.GET_DDL('TABLE',u.table_name) from USER_TABLES u;
SELECT DBMS_METADATA.GET_DDL('VIEW',u.VIEW_name) from USER_VIEWS u;
SELECT DBMS_METADATA.GET_DDL('INDEX',u.index_name) from USER_INDEXES u;
spool off;
3. 获取某个SCHEMA的建全部存储过程的语法
set pagesize 0
set long 90000
set feedback off
set echo off
spool procedures.sql
select DBMS_METADATA.GET_DDL('PROCEDURE',u.object_name) from user_objects u where object_type = 'PROCEDURE';
spool off;
4. 获取某个SCHEMA的建全部函数的语法
set pagesize 0
set long 90000
set feedback off
set echo off
spool function.sql
select DBMS_METADATA.GET_DDL('FUNCTION',u.object_name) from user_objects u where object_type = 'FUNCTION';
spool off;
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select d.code,d.name, sum(w.weight) weight,round(avg(w.price),2) price,sum(w.money) money
from weight_info w left outer join t_dict d on w.productcode=d.code left outer join t_balancecode b on w.balancecode=b.balancecode where 1=1 and w.operdate>TO_TIMESTAMP('2009-11-2 04:12:32.0', ' ......
转自:http://blog.csdn.net/wangdongzjk/archive/2005/11/18/532424.aspx
事关CUBE ROLLUP GROUPING SETS(1)
原文引自:
聚合是数据仓库的基础。为了提高聚合的性能。Oracle提供了Group By 条款的扩展。
1. CUBE, ROLLUP扩展
2. 3个grouping函数
......
Step1. Insert empty_clob() into the Clob column of Oracle
Step2. Set autocommit to false
Step3. Select Clob as oracle.sql.CLOB from database
Step4. Insert String into Clob
Step5. Commit
Example:
import java.sql.*;
import java.io.*;
import oracle.jdbc.driver.OracleResultSet;
......
单行函数:
函数类别:
单行:返回单个结果:substr,length
多行:返回多个结果,any,all
单行的分类:
字符类,日期类,数字类,转换类,通用类
1.字符类
转换大小写:
lower:转换为小写
Select ENAME,LOWER(ENAME) from EMP
upper:转换为大写
Select upper( ......
项目中,需要建立自增长字段,但碰到oracle本身不支持此种类型的字段,只好用别的办法。
ORACLE自增长字段实现(转)
首先,你要有一张表!
CREATE TABLE example(
&nbs ......