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[SQL]Oracle正常SQL(2004�q�第1�?

sunfruit — Thu, 06 Sep 2007 01:40:00 GMT

    --sunfruit

    该文档非常好的Oracle�l�护学习(f��n)文档

     文档目录如下

     监控SQL
     常用��L(f��ng)��SQL
     查询表结�?br />      表空间��用状�?br />      查询某个模式下面数据不�ؓ(f��)�I�的�?br />      客户端主��Z��?br />      安装Oracle以后�Q�经�怋�用的修改表空间的SQL代码
     查看回滚�D�名�U�及(qi��ng)大小
     PL/SQL入门教程
     在from后面使用变量
     Oracle常用数据字典
     在Oracle中实现数据库的复�?br />      SQL*PLUS环境输入'&字符'的方�?br />      ��说创建用�?br />      ��说Oracle启动�?qi��ng)关闭数据库实�?br />      ��说Oracle数据库导�?exp)/导入(imp)
     实例:Oracle导出Excel文�g
     实例:Oracle导出HTM文�g
     查看数据库保留字
     数据字典�?qi��ng)某些字�D�|��?br />
      下蝲地址  http://www.fruitres.cn/servlet/buyproductservlet?tag=single&tag1=info&PRODUCT_ID=244294537&number=0
      更多资料  http://www.fruitres.cn/

sunfruit 2007-09-06 09:40 发表评论

[原创](m��i)Oracle表结构导��Zؓ(f��)HTML工具1.0.4

sunfruit — Thu, 19 Jul 2007 03:41:00 GMT

--sunfruit
��Oracle表结构导出成Html��面的工�?br />
1.0.4
增加�?ji��n)导��(gu��)��发器、存储过�E�、函数的功能�Q��ƈ且修改了(ji��n)不能导出KEYS全部�c�d��的BUG

1.0.3
增加�?ji��n)导出Sequences、View的功能，�q�且导出界面默认导出到安装文件夹中的export目录�?br />
1.0.2
增加�?ji��n)导出KEYS、INDEX的功�?br />
1.0.1
增加�?ji��n)导出完毕以后直接点��(y��n)L��开文�g夏V��打开文�g的查看方式，�q�且支持Linux/Win �q�_��

1.0.0
导出为html文�g�Q�导出完毕后直接查看index.html文�g卛_��。导出的内容包括各个表的名称索引和注释以�?qi��ng)表中各个字�D늚�明细和注�?

下蝲地址 http://www.fruitres.cn/servlet/buyproductservlet?tag=single&tag1=info&PRODUCT_ID=942025602&number=0 下蝲版本1.0.4
更多工具和文档请�?http://www.fruitres.cn/

sunfruit 2007-07-19 11:41 发表评论

Oracle Spatial建立�q�程

sunfruit — Tue, 25 Jul 2006 02:31:00 GMT

--sunfruit

�I�间数据库Oracle Spatial的徏立过�E�如下：(x��)

-- 创徏最基本的个人兴��点表结�?br />drop table poi;
create table poi (gid I(y��ng)NTEGER,
  opid I(y��ng)NTEGER,
  gname VARCHAR2(256),
  gshape MDSYS.SDO_GEOMETRY);

-- 更新用户�I�间数据对象视图(建立索引依赖�?
delete from USER_SDO_GEOM_METADATA where TABLE_NAME='POI' and COLUMN_NAME='GSHAPE';
insert into USER_SDO_GEOM_METADATA values ('poi',
     'gshape',
     MDSYS.SDO_DIM_ARRAY(MDSYS.SDO_DIM_ELEMENT('lon', -- lontitude
          -64800000, -- min(china 26430867 73.41907434101486)
          64800000, -- max(china 49679991 137.99997381765377)
          1),  -- scale (china abs 23249124)
       MDSYS.SDO_DIM_ELEMENT('lat',  -- latitude
          -32400000, -- min(china -1677502 -4.6597267116858045)
          32400000, -- max(china 21571819 59.92171939467364)
          1)),  -- scale (china abs 23249321)
     NULL);

-- 插入一个个人兴��点的SQL语句�Q��用标准点地物�I�间数据�c�d��
delete from POI;
insert into POI values (20010001,
   1,
   '我的�?,
   MDSYS.SDO_GEOMETRY(2001, -- SDO_GTYPE
     NULL,  -- SDO_SRID
     SDO_POINT_TYPE(41884696, 14377039, NULL), NULL, NULL));

-- 插入一个个人兴��点的SQL语句�Q��用另一�U�点地物�I�间数据�l�织�l�构
delete from POI;
insert into POI values (20010001,
   1,
   '我的�?,
   MDSYS.SDO_GEOMETRY(2001, -- SDO_GTYPE
     NULL,  -- SDO_SRID
     NULL,  -- SDO_POINT
     MDSYS.SDO_ELEM_INFO_ARRAY (1, -- SDO_STARTING_OFFSET
        1, -- SDO_ETYPE
        1), -- SDO_INTERPRETATION
     MDSYS.SDO_ORDINATE_ARRAY (41884696,14377039)));

-- 创徏�~�省的R-tree�I�间索引
drop index POI_IDX;
CREATE INDEX POI_IDX on poi(gshape)
I(y��ng)NDEXTYPE is MDSYS.SPATIAL_INDEX;
-- PARAMETERS('SDO_LEVEL=10000'); -- 180*60*60*1000*2/100/100*90*60*60*1000*2/100/100 = 8398080000

-- 索引�_��o(h��)矩�Ş�H�口选择SQL语句(对于点地物对象，索引�_��o(h��)的结果是�_��?
SELECT * FROM POI P
WHERE sdo_filter(P.gshape,
  mdsys.sdo_geometry(2003,NULL,NULL,
    mdsys.sdo_elem_info_array(1,1003,3),
    mdsys.sdo_ordinate_array(41883696,14376039, 41885696,14378039)),
  'querytype=window') = 'TRUE';

-- �_��匚w��矩�Ş�H�口选择SQL语句(计算非常耗时)
SELECT * FROM POI P
WHERE sdo_relate(P.gshape,
  mdsys.sdo_geometry(2003,NULL,NULL,
    mdsys.sdo_elem_info_array(1,1003,3),
    mdsys.sdo_ordinate_array(41883696,14376039, 41885696,14378039)),
  'mask=INSIDE querytype=window') = 'TRUE';

sunfruit 2006-07-25 10:31 发表评论

[原创](m��i)Oracle Spatial新驱动的查询记录实例

sunfruit — Thu, 20 Jul 2006 07:28:00 GMT

--sunfruit
Oracle的空间数据库的操作驱动更��C��(ji��n)�Q�新的驱动适用于Oracle8.0或以上，新驱动在�Ҏ(gu��)��据库的操作上面和原有的驱动差别比较大�Q�不�q�有一点：(x��)使用变得��单了(ji��n)
建立�I�间数据库和建立�I�间索引的步骤就略过�?ji��n)，那些�|�上有很多例子，而且实现方式上面也没有变化，下面列出查询�I�间数据库记录的代码�Q?br />
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import oracle.spatial.geometry.JGeometry;
import java.sql.PreparedStatement;
import oracle.sql.STRUCT;
import java.sql.Connection;

/**
*

Title:

*
*

Description:

*
*

Company:

*
* @author sunfruit
* @version 1.0
*/
public class SdoSelect {
public SdoSelect() {
}
public static void main(String[] args) {
    String driver = "oracle.jdbc.driver.OracleDriver";
    String url = "jdbc:oracle:thin:@172.16.75.200:1521:starmap";
    String uid = "hmbst";
    String psw = "hmbst";
    Connection conn = null;
    PreparedStatement ps=null;
    try {
      Class.forName(driver);
      conn = DriverManager.getConnection(url, uid, psw);

      JGeometry jGeometry=new JGeometry(41884696,14377039,42884696,14477039,0);
      STRUCT obj =jGeometry.store(jGeometry,conn);
      String sql = "SELECT * FROM POISDO p WHERE sdo_filter(p.gshape,?,'querytype=window')='TRUE'";
      ps = conn.prepareStatement(sql,ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY);
      ps.clearParameters();
      ps.setObject(1, obj);
      // 插入点地物记�?br />      ResultSet rs=ps.executeQuery();
      while(rs.next())
      {
        STRUCT st = (oracle.sql.STRUCT)rs.getObject("gshape");
        JGeometry j_geom = JGeometry.load(st);
        double[] dou=j_geom.getPoint();
        String buff="";
        for(int i=0;i        {
          buff=buff+String.valueOf((int)dou[i])+"   ";
        }
        System.out.println(buff);
      }
    }
    catch (Exception ex) {
      ex.printStackTrace();
    }
    finally
    {
      if(conn!=null)
      {
        try {
          conn.close();
        }
        catch (SQLException ex) {
          ex.printStackTrace();
        }
      }
      if(ps!=null)
      {
        try {
          ps.close();
        }
        catch (SQLException ex) {
          ex.printStackTrace();
        }
      }

}
}

}

表POISDO的结构如�?br />create table poi (
id I(y��ng)NTEGER,
gname VARCHAR2(256),
gshape MDSYS.SDO_GEOMETRY);

sunfruit 2006-07-20 15:28 发表评论

[原创](m��i)Oracle Spatial新驱动的��d��记录实例

sunfruit — Thu, 20 Jul 2006 07:25:00 GMT

    --sunfruit
    Oracle的空间数据库的操作驱动更��C��(ji��n)�Q�新的驱动适用于Oracle8.0或以上，新驱动在�Ҏ(gu��)��据库的操作上面和原有的驱动差别比较大�Q�不�q�有一点：(x��)使用变得��单了(ji��n)
    建立�I�间数据库和建立�I�间索引的步骤就略过�?ji��n)，那些�|�上有很多例子，而且实现方式上面也没有变化，下面列出��d��一条空间数据库记录的代码：(x��)

import java.sql.*;
import oracle.sql.*;
import oracle.spatial.geometry.JGeometry;

/**
*

Title:

*
*

Description:

*
*

Company:

*
* @author not attributable
* @version 1.0
*/
public class SdoAdd {
public static void main(String[] args) {
    String driver = "oracle.jdbc.driver.OracleDriver";
    String url = "jdbc:oracle:thin:@172.16.75.200:1521:starmap";
    String uid = "hmbst";
    String psw = "hmbst";
    Connection conn = null;
    PreparedStatement ps=null;
    try {
      Class.forName(driver);
      conn = DriverManager.getConnection(url, uid, psw);

      JGeometry jGeometry=new JGeometry(41884696,14377039,0);
      STRUCT obj =jGeometry.store(jGeometry,conn);
      String sql =
          "insert into POISDO values(seq_poi_id.nextval,?,?)";
      ps = conn.prepareStatement(sql,ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_UPDATABLE);
      ps.clearParameters();
      ps.setString(1, "我的�?);
      ps.setObject(2, obj);
      // 插入点地物记�?br />      ps.executeUpdate();
      conn.commit();
    }
    catch (Exception ex) {
      ex.printStackTrace();
    }
    finally
    {
      if(conn!=null)
      {
        try {
          conn.close();
        }
        catch (SQLException ex) {
          ex.printStackTrace();
        }
      }
      if(ps!=null)
      {
        try {
          ps.close();
        }
        catch (SQLException ex) {
          ex.printStackTrace();
        }
      }

    }
}
}

表POISDO的结构如�?br />create table poi (
id I(y��ng)NTEGER,
  gname VARCHAR2(256),
  gshape MDSYS.SDO_GEOMETRY);

sunfruit 2006-07-20 15:25 发表评论

Oracle Spatial详解

sunfruit — Wed, 19 Jul 2006 07:21:00 GMT

Step1. 创徏一张表�Q�其中shape用来存放�I�间数据
CREATE TABLE mylake (
    feature_id NUMBER PRIMARY KEY,
    name VARCHAR2(32),
    shape MDSYS.SDO_GEOMETRY);

Step2. �?font color="#003366">user_sdo_geom_metadata 表中插入新记录，用于描述�I�间字段
INSERT INTO user_sdo_geom_metadata VALUES (
    'mylake',    //---表名
    'shape',    //---字段�?br />    MDSYS.SDO_DIM_ARRAY(
        MDSYS.SDO_DIM_ELEMENT('X', 0, 100, 0.05),    //---X�l�最��，最大值和容忍度�?br />        MDSYS.SDO_DIM_ELEMENT('Y', 0, 100, 0.05)    //---Y�l�最��，最大值和容忍�?br />    ),
    NULL    //---坐标�p�，�~�省为笛卡尔坐标�p?/font>
);

Step3. 创徏�I�间索引
CREATE INDEX mylake_idx ON mylake(shape)
INDEXTYPE IS MDSYS.SPATIAL_INDEX

Step4. 插入�I�间数据
Oracle Spatial�?code>MDSYS.SDO_GEOMETRY来存储空间数�?定义为：(x��)CREATE TYPE sdo_geometry AS OBJECT ( SDO_GTYPE NUMBER, SDO_SRID NUMBER, SDO_POINT SDO_POINT_TYPE, SDO_ELEM_INFO MDSYS.SDO_ELEM_INFO_ARRAY, SDO_ORDINATES MDSYS.SDO_ORDINATE_ARRAY); SDO_GTYPE�Q?font color="#000000">用四个数字定义了(ji��n)所有的形状 �W�一�?�l�数 �W�二�?�U�性表�C�。用�?�Q?�l�数据，二维�? 最后两�?

Value	Geometry	Description
00	`UNKNOWN_GEOMETRY`	Spatial ignores this value
01	`POINT`	A single point element
02	`LINE` or `CURVE`	Contains one line string element that may be linear, curved or both
03	`POLYGON`	Contains one polygon element with or without other polygon elements in it
04	`COLLECTION`	A heterogeneous collection of elements
05	`MULTIPOINT`	Contains one or more points
06	`MULTILINE` or `MULTICURVE`	Contains one or more line string elements
07	`MULTIPOLYGON`	Contains multiple polygon elements that maybe disjoint

SDO_SRID�Q?font color="#000000">坐标�p�，NULL为笛卡尔坐标�p�R�?br />SDO_POINT�Q?/font>Oracle Spatial也可定义单个的点�Q?font color="#003366">SDO_POINT的定�?
CREATE TYPE sdo_point_type AS OBJECT (X NUMBER,Y NUMBER,Z NUMBER); 如何是二�l�_(d��)��Z为NULL�?br />SDO_ELEM_INFO�Q?/font>每三个值描�q�C��?font color="#000000">元素�?br /> �W�一个��|��(x��)�W�一个顶点在SDO_ORDINATES_ARR开始位�|?br /> �W�二个��|��(x��)元素�c�d�� W�三个��|��(x��)��点�q�接方式�Q?-通过直线�q�接�Q?-通过圆弧�q�接定义�?br /> CREATE TYPE sdo_elem_info_array AS VARRAY (1048576) of NUMBER; SDO_ORDINATES�Q?font color="#000000">几何囑�Ş所有顶点列表。定义�ؓ(f��) CREATE TYPE sdo_ordinate_array AS VARRAY (1048576) of NUMBER;

FONT color=#003366>// 插入包含一个岛屿的湖泊
INSERT INTO mylake VALUES( 10, 'Lake Calhoun', MDSYS.SDO_GEOMETRY( 2003, NULL, NULL, MDSYS.SDO_ELEM_INFO_ARRAY(1,1003,1, 19,2003,1), MDSYS.SDO_ORDINATE_ARRAY(0,0, 10,0, 10,10, 0,10, 0,0, 4,4, 6,4, 6,6, 4,6, 4,4) ));

// 插入两艘��船
INSERT INTO mylake VALUES( 11, 'The Windswept', MDSYS.SDO_GEOMETRY( 2003, NULL, NULL, MDSYS.SDO_ELEM_INFO_ARRAY(1,1003,1), MDSYS.SDO_ORDINATE_ARRAY(2,2, 3,2, 3,2, 2,3, 2,2) ) ); INSERT INTO mylake VALUES( 12, 'Blue Crest', MDSYS.SDO_GEOMETRY( 2003, NULL, NULL, MDSYS.SDO_ELEM_INFO_ARRAY(1,1003,1), MDSYS.SDO_ORDINATE_ARRAY(7,7, 8,7, 8,7, 7,8, 7,7) ) );

Step4. 查询
Oracle Spatial查询数据包括二个处理�q�程�Q?br />1.只通过索引查询候选项。通过函数SDO_FILTER实现�Q?br /> SDO_FILTER(geometry1 MDSYS.SDO_GEOMETRY, geometry2 MDSYS.SDO_GEOMETRY, params VARCHAR2)geometry1�Q?/font> 必须是被索引的几何数�?br />geometry2�Q?/font>不一定是表中的空间字�D�，也不要求被烦(ch��)�?br />params�Q?/font>Filter�c�d��
querytype=WINDOW�Q?/font>geometry2不要求来自表
querytype=JOIN�Q�geometry2必须来自�?/p>

SELECT name boat_name
FROM mylake t
WHERE feature_id = 12
AND SDO_FILTER(t.shape, mdsys.sdo_geometry(2003,NULL,NULL,
    mdsys.sdo_elem_info_array(1,1003,1),
    mdsys.sdo_ordinate_array(2,2, 5,2, 5,5, 2,5, 2,2)),
    'querytype=WINDOW') = 'TRUE';

2.再检查每个候选项是否和条件精��匹配。通过函数SDO_RELATE实现�Q?br />SDO_RELATE(geometry1 MDSYS.SDO_GEOMETRY, geometry2 MDSYS.SDO_GEOMETRY, params VARCHAR2)
masktype�c�d��


								DISJOINT

�?the boundaries and interiors do not intersect


								TOUCH

�?the boundaries intersect but the interiors do not intersect


								OVERLAPBDYDISJOINT

�?the interior of one object intersects the boundary and interior of the other object, but the two boundaries do not intersect. This relationship occurs, for example, when a line originates outside a polygon and ends inside that polygon.


								OVERLAPBDYINTERSECT

�?the boundaries and interiors of the two objects intersect


								EQUAL

�?the two objects have the same boundary and interior


								CONTAINS

�?the interior and boundary of one object is completely contained in the interior of the other object


								COVERS

�?the interior of one object is completely contained in the interior of the other object and their boundaries intersect


								INSIDE

�?the opposite of CONTAINS. A INSIDE B implies B CONTAINS A.


								COVEREDBY

�?the opposite of COVERS. A COVEREDBY B implies B COVERS A.

ON

�?the interior and boundary of one object is on the boundary of the other object (and the second object covers the first object). This relationship occurs, for example, when a line is on the boundary of a polygon.


								ANYINTERACT

�?the objects are non-disjoint.

// 选择在定义矩形内的所有小�?code>
SELECT name boat_name
FROM mylake t
WHERE feature_id = 12
AND SDO_FILTER(t.shape, mdsys.sdo_geometry(2003,NULL,NULL,
    mdsys.sdo_elem_info_array(1,1003,1),
    mdsys.sdo_ordinate_array(2,2, 5,2, 5,5, 2,5, 2,2)),
    'querytype=WINDOW') = 'TRUE'
AND SDO_RELATE(t.shape, mdsys.sdo_geometry(2003,NULL,NULL,
    mdsys.sdo_elem_info_array(1,1003,1),
    mdsys.sdo_ordinate_array(2,2, 5,2, 5,5, 2,5, 2,2)),
    'masktype=INSIDE querytype=WINDOW') = 'TRUE'

// masktype可联合��?br />SELECT feature_id id FROM mylake t WHERE feature_id = 12 AND SDO_FILTER(t.shape, mdsys.sdo_geometry(2003,NULL,NULL, mdsys.sdo_elem_info_array(1,1003,1), mdsys.sdo_ordinate_array(2,2, 5,2, 5,5, 2,5, 2,2)), 'querytype=WINDOW') = 'TRUE' AND SDO_RELATE(t.shape, mdsys.sdo_geometry(2003,NULL,NULL, mdsys.sdo_elem_info_array(1,1003,1), mdsys.sdo_ordinate_array(2,2, 5,2, 5,5, 2,5, 2,2)), 'masktype=INSIDE+TOUCH querytype=WINDOW') = 'TRUE'

Oracle Spatial 提供的其他查询函敎ͼ�(x��)

Query	Description
`SDO_NN`	Nearest neighbor
`SDO_SDO_WITHIN_DISTANCE`	All geometries with a certain distance

Functions	Description
`SDO_GEOM.SDO_MBR`	The minimum bounding rectangle for a geometry
`SDO_GEOM.SDO_DISTANCE`	The distance between two geometries
`SDO_GEOM.SDO_INTERSECTION`	Provides the intersection point of two geometries

sunfruit 2006-07-19 15:21 发表评论

JAVA调用�q�回�l�果集的存储�q�程--Sql 2000

sunfruit — Thu, 15 Jun 2006 01:44:00 GMT

--sunfruit

建立存储�q�程如下�Q�注意这个存储过�E�徏立的时候，不需要像Oracle那样建立�q�回的游�?br />开始在Sql 2000按照Oracle那样建立�?ji��n)返回的游标[Sql 2000 的帮助里面也是徏立返回的游标的]�Q�但是调用��L��不成功，后来使用�?ji��n)没有返回游标的存储�q�程�Q��ƈ且修改了(ji��n)调用存储�q�程的方式就可以�?ji��n)�?x��)
CREATE PROCEDURE PROC_WARE_INFO_STAT
@XX_ID bigint

AS
SELECT * FROM TableName where colname=XX_ID
GO

在调用的时候和Oracle有明昄��不同�Q�如下：(x��)

Connection connection=xxxxxx;
CallableStatement callableStatement = connection.prepareCall("{call PROC_WARE_INFO_STAT(?) }");
callableStatement.setInt(1,100);
callableStatement.executeQuery();
ResultSet rs = callableStatement.getResultSet();

sunfruit 2006-06-15 09:44 发表评论

JAVA调用�q�回�l�果集的存储�q�程--Oracle

sunfruit — Thu, 15 Jun 2006 01:36:00 GMT

--sunfruit

建立存储�q�程�Q�存储过�E��ؓ(f��)�Q?/p>

CREATE OR REPLACE PROCEDURE TESTC(p_CURSOR out TESTPACKAGE.Test_CURSOR) IS

BEGIN

OPEN p_CURSOR FOR SELECT * FROM HYQ.TESTTB;

END TESTC;

可以看到�Q�它是把游标�Q�可以理解�ؓ(f��)一个指针）(j��)�Q�作��Z��个out 参数来返回值的�?/p>

在java里调用时��q��下面的代码：(x��)

package com.hyq.src;

import java.sql.*;

import java.io.OutputStream;

import java.io.Writer;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import oracle.jdbc.driver.*;

public class TestProcedureTHREE {

public TestProcedureTHREE() {

}

public static void main(String[] args ){

String driver = "oracle.jdbc.driver.OracleDriver";

String strUrl = "jdbc:oracle:thin:@127.0.0.1:1521:hyq";

Statement stmt = null;

ResultSet rs = null;

Connection conn = null;

try {

Class.forName(driver);

conn = DriverManager.getConnection(strUrl, "hyq", "hyq");

CallableStatement proc = null;

proc = conn.prepareCall("{ call hyq.testc(?) }");

proc.registerOutParameter(1,oracle.jdbc.OracleTypes.CURSOR);

proc.execute();

rs = (ResultSet)proc.getObject(1);

while(rs.next())

{

System.out.println("" + rs.getString(1) + ""+rs.getString(2)+"");

}

catch (SQLException ex2) {

ex2.printStackTrace();

}

catch (Exception ex2) {

ex2.printStackTrace();

}

finally{

try {

if(rs != null){

rs.close();

if(stmt!=null){

stmt.close();

}

if(conn!=null){

conn.close();

}

catch (SQLException ex1) {

}

在这里要注意�Q�在执行前一定要先把oracle的驱动包攑ֈ�class路径里，否则�?x��)报错的�?br />

sunfruit 2006-06-15 09:36 发表评论

Oracle优化你的查询--关于避免索引隐式失效

sunfruit — Sun, 19 Feb 2006 09:26:00 GMT

--sunfruit

说明�?ji��n)Oracle数据库中的烦(ch��)引隐式失效的问题

1、隐式�{换导致烦(ch��)引失�?�q�一点应当引起重�?也是开发中�l�常�?x��)犯的错�?
    �׃��表的字段tu_mdn定义为varchar2(20),但在查询时把该字�D�作为number�c�d��以where条�g传给Oracle,�q�样�?x��)导致�?ch��)引失�?
    错误的例子：(x��)select * from test where tu_mdn=13333333333;
    正确的例子：(x��)select * from test where tu_mdn='13333333333';

2、对索引列进行运��导致烦(ch��)引失�?我所指的对烦(ch��)引列�q�行�q�算包括(+�Q?�Q?�Q?�Q? �{?
    错误的例子：(x��)select * from test where id-1=9;
    正确的例子：(x��)select * from test where id=10;

3、��用Oracle内部函数��D��索引失效.对于�q�样情况应当创徏��Z��函数的烦(ch��)�?
    错误的例子：(x��)select * from test where round(id)=10; 说明�Q�此时id的烦(ch��)引已�l�不起作用了(ji��n)
    正确的例子：(x��)首先建立函数索引�Q�create index test_id_fbi_idx on test(round(id));
                     然后 select * from test where round(id)=10; �q�时函数索引起作用了(ji��n)

sunfruit 2006-02-19 17:26 发表评论

Oracle日期函数的一些�ȝ��

sunfruit — Sun, 19 Feb 2006 09:22:00 GMT

--sunfruit

�ȝ��?ji��n)Oracle中关于日期函数的一些用法和技�?/P>

上月末天�Q?BR>SQL> select to_char(add_months(last_day(sysdate),-1),'yyyy-MM-dd') LastDay from
2 dual
3 ;

LASTDAY
----------
2004-09-30

上月今天
SQL> select to_char(add_months(sysdate,-1),'yyyy-MM-dd') PreToday from dual
2 ;

PRETODAY
----------
2004-09-29

上月首天
SQL> select to_char(add_months(last_day(sysdate)+1,-2),'yyyy-MM-dd') FirstDay
2 from dual;

FIRSTDAY
----------
2004-09-01

以下转脓(chu��ng)�Q?BR> Oracle
在日期��用上允许极大的灵�z�L��。由于可以在日期字段存储旉��和日期，从而有函数可以既引用日期又引用旉��?BR>Oracle 所提供的一些日期函数如下所�C��?BR>1. SYSDATE
�q�回当前的日期和旉��?BR>�C�Z��
SELECT sysdate FROM dual;

SYSDATE
----------
05-3�?-03

2. ADD_MONTHS(d, no_of_month)
当前日期"m"后推"no_of_month" 个月。参�?no_of_month"可�ؓ(f��)��M��整数�?BR>�C�Z��
SELECT add_months(sysdate,2) FROM dual;

ADD_MONTHS
----------
05-5�?-03

SELECT add_months(sysdate,-2) FROM dual;

ADD_MONTHS
----------
05-1�?-03

3. LAST_DAY(month_day)
�q�回变量"month_day"中所指定月䆾的最后一天的日期�?BR>�C�Z��
SELECT last_day(sysdate) FROM dual;

LAST_DAY(S
----------
31-3�?-03

4. MONTHS_BETWEEN(d1, d2)
�q�回日期 d1 �?d2 之间的月份数。如�?d1 晚于 d2�Q�结果�ؓ(f��)正，否则�q�回负数�?BR>�C�Z��
SELECT months_between(sysdate,to_date('20030101','YYYYMMDD')) FROM dual;

MONTHS_BETWEEN(SYSDATE,TO_DATE('20030101','YYYYMMDD'))
------------------------------------------------------
2.15773932

5. NEXT_DAY(d, day_of_week)
�q�回�?day_of_week"命名的，在变�?d"指定的日期之后的�W�一个工作日的日期。参�?day_of_week"必须��星期中的某一天�?BR>�C�Z��
-- 2003.3.2 是星期日
SELECT next_day(to_date('20030226','YYYYMMDD'),1) FROM dual;

NEXT_DAY(T
----------
02-3�?-03

日期格式
格式元素        说明
AD �?A.D.      带有或不带有句号�?AD 标记
BC �?B.C.      带有或不带有句号�?BC 标记
D               一周中的天 (1-7)
DAY             天的名称 (Sunday - Saturday)
DD              一月中的天 (1 - 31)
DDD             一�q�中的天 (1 - 366)
DY              天的�~�写 (Sun - Sat)
HH              一天中的小�?(1 - 12)
HH24            一天中的小�?(0 - 23)
MI              分钟 (0-59)
MM              �?(01-12)
MON             月名�U�的�~�写
MONTH           月的名称
SS              �U?(0-59)
YYYY            4 个数字表�C�的�q?/P>

sunfruit 2006-02-19 17:22 发表评论