??xml version="1.0" encoding="utf-8" standalone="yes"?>香蕉久久夜色精品国产更新时间 ,毛片网站在线看,亚洲一区亚洲二区亚洲三区http://www.aygfsteel.com/Jkallen/category/6935.html开h?/description>zh-cnWed, 28 Feb 2007 00:03:43 GMTWed, 28 Feb 2007 00:03:43 GMT60oracle select语句学习http://www.aygfsteel.com/Jkallen/archive/2006/07/28/60508.htmlJkallenJkallenFri, 28 Jul 2006 02:56:00 GMThttp://www.aygfsteel.com/Jkallen/archive/2006/07/28/60508.htmlhttp://www.aygfsteel.com/Jkallen/comments/60508.htmlhttp://www.aygfsteel.com/Jkallen/archive/2006/07/28/60508.html#Feedback1http://www.aygfsteel.com/Jkallen/comments/commentRss/60508.htmlhttp://www.aygfsteel.com/Jkallen/services/trackbacks/60508.html来了CQ?关于数据查询分析pȝ?所以重温一下相关东?ZC下?br />
刚刚看了下racle单行函数Q主要是字符Q数字,日期Q{换,通用五个斚w?br />
1>字符处理

upper(str)---字W串str全部转换成大?br />lower(str)---字W串str全部转换成小?br />initcap(str)---字W串中每个单词的首字母大?br />concat(str1,str2)---字W串str1与str2q接h(也可以通过'||'L接相q?
substr(str,a,b)---取字W串str中的指定字符Q从位置a开始取长度为b的字W串Q假如a为正则从左边开始,否则从右边开?br />instr(str,'z')---取得str字符串中从左边开始每一ơ出现z字符的下标位|?下标?开?
lpad(str,12,'*')---左填充,卛_字符串str长度填充?2Q假如其不12位则在左边以*号填?br />rpad(str,12,'*')---叛_充,同上
length(str)---计算字符串str的长?br />
2>数字函数

round(45.926,2)---前一C留指定的数位,q四舍五?45.93)Q假如指定位是负数则意ؓ在小数点左边保留指定?如round(45.923,-1)=50,rount(45.923,0)=46,round(45.93,-2)=0,round(55.93,-2)=100
trunc(45.926,2)---同上Q得不四舍五?45.92)
mod(1600,300)---求余(100)

3>日期型函?br />
oracle中默认的格式是:DD-MON-RR?br />oracle中有个到当前pȝ旉--sysdateQ如Q?br />select sysdate from dual

可对日期q行自述q算Q?br />select (sysdate-mybirthday)/7 from person

months_between('01-sep-95','11-jan-94')---取得二个日期之间的间隔月?19.6774194)
add_months('11-jan-94',6)---l指定日期加上指定的月䆾后得C个新的日?11-jul-94)
next_day('01-sep-85','friday')---取得当前日期中下个周五的日期(01-jul-95)
last_day('01-feb-95')---取得当前日期中月份的最后一?28-feb-95)

roundq行四舍五入Qtrunc则否,以下是我的操作结果:
sysdate为:
SYSDATE
----------
28-7?-06

 select
 round(sysdate,'month') RM,
 round(sysdate,'year') RY,
 trunc(sysdate,'month') TM,
 trunc(sysdate,'year') TY
 from dual;

RM         RY         TM         TY
---------- ---------- ---------- ----------
01-8?-06 01-1?-07 01-7?-06 01-1?-06


4>转换函数

隐式转换:pȝ自动转换,如:
varchar2 or char to number
varchar2 or char to date
number to varchar2
date to varchar2

昑ּ转换QhZ函数加以转换
日期Q字W,数据三者之间可以相互{?日期<-->字符<-->数据
日期格式:YYYY

日期-->字符
select to_char(sysdate,'yyyy-mm-dd') ch from dual

CH
----------
2006-07-28

数字-->字符
to_char(number,'format_model'),oramat_model有如下:
9---用对应数字表C?br />0---强制用0表示
$---加一$W号
L---前加本地货币单位表示
.---十进制点
,---千进制点

select to_char(0917,'l9999.99') local from dual
LOCAL
------------------
         RMB917.00

字符-->日期
tselect to_date('19830917','yyyy-mm-dd') bir from dual
BIR
----------
17-9?-83

字符-->数字
select to_number('19821217','999999999') mybr from dual
      MYBR
----------
  19821217

注:所有函数均可以嵌套使用

5>通用函数

nvl(expr1,expr2)---expr1为空则显Cexpr2,否则昄expr1
nvl2(expr1,expr2,expr3)---expr1为空则显Cexpr2,否则昄expr3
nullif(expr1,expr2)---二个相等则显C空W?否则昄expr1
coalesce(expr1,expr2,...,exprn)---从expr1开始依ơ找C为空的exprQ找到就昄Q直到最后,否则?/p>

Cexprn
case表达式,如下?

 

6>多表查询
Ҏ通的多表查询Q也是不加where条g的时候实际上查询l果是各表的W卡集
外连接:oracle实现外连接时?L二边?号就OKQ当+在左ҎUCؓ双接,反之为左q接,它常常用来当要求未受限制对象的表数据也要求显C时Q如下:
select * from student

ID NAME                 ADDRESS
-------------------- --------------
1 zhangshan            zhejiang
3 lishi                hangzhou
7 lily                 guangzhou

select * from person

ID NAME                 ADDRESS
- -------------------- -----------
1 zhangshan            zhejiang
3 lishi                hangzhou
7 lily                 guangzhou

select p.id,p.sex,s.id,s.name,s.address from person p ,student s where p.id(+) = s.id

ID SEX          ID NAME                 ADDRESS
-- ---- ---------- -------------------- ------------
 1 boy           1 zhangshan            zhejiang
 3 girl          3 lishi                hangzhou
                 7 lily                 guangzhou

select p.id,p.sex,s.id,s.name,s.address from person p ,student s where p.id = s.id(+)

ID SEX          ID NAME                 ADDRESS
-- ---- ---------- -------------------- --------------
 1 boy           1 zhangshan            zhejiang
 2 girl
 3 girl          3 lishi                hangzhou
 4 boy
 5 girl

self-joinQ就是同一张表q接Q用自连接的时候要注意排除重复的记录(自nQ@环重复等Q,比如说找出student表中所有住在同一个地方的人?br />select * from student

 ID NAME                 ADDRESS
--- -------------------- ---------
  1 zhangshan            zhejiang
  3 lishi                hangzhou
  7 lily                 guangzhou
  2 name2                guangzhou
  4 name4                guangzhou
  5 name5                hangzhou
  6 name6                shanghai
  8 name8                shanghai

没有排除重复记录时的l果Q?br /> select t1.name,t2.name
 from student t1, student t2
 where t1.address = t2.address

NAME                 NAME
-------------------- --------------
lily                 lily
name2                lily
name4                lily
lily                 name2
name2                name2
name4                name2
lily                 name4
name2                name4
name4                name4
lishi                lishi
name5                lishi

NAME                 NAME
-------------------- --------------
lishi                name5
name5                name5
name6                name6
name8                name6
name6                name8
name8                name8
zhangshan            zhangshan

已选择18?/p>

排除重复与@环记录之后:
select t1.name,t2.name,t1.address
 from student t1, student t2
 where t1.address = t2.address
and t1.id > t2.id

NAME                 NAME                 ADDRESS
-------------------- -------------------- -------------------
lily                 name2                guangzhou
name4                name2                guangzhou
lily                 name4                guangzhou
name5                lishi                hangzhou
name8                name6                shanghai

cross join,无条件连接,实际上跟不带where时一样得到的是笛卡尔?/p>

natural joinQ也可以直接CjoinQ,Ҏ表中同名栏位来连接记?若表中可能出现多个同名栏位,则用using(col_name)来指定所栏位。colname不能指定表的别名Q限制条件用on来指?br />select id,p.sex,id,s.name from person p join student s using(id);

  ID SEX          ID NAME
---- ---- ---------- --------------------
   1 boy           1 zhangshan
   2 girl          2 name2
   3 girl          3 lishi
   4 boy           4 name4
   5 girl          5 name5

在sql标准语法???q接用left(right) out join,限制条g用on可以了?/p>

full out join完全外连?֐思义是左外q接与右外连接都?br />select id,p.sex,id,s.name from person p full join student s using(id);

  ID SEX          ID NAME
---- ---- ---------- ------------------
   1 boy           1 zhangshan
   3 girl          3 lishi
   2 girl          2 name2
   4 boy           4 name4
   5 girl          5 name5
   8               8 name8
   6               6 name6
   7               7 lily




Jkallen 2006-07-28 10:56 发表评论
]]>
存储大数?/title><link>http://www.aygfsteel.com/Jkallen/archive/2006/03/05/33671.html</link><dc:creator>Jkallen</dc:creator><author>Jkallen</author><pubDate>Sun, 05 Mar 2006 03:49:00 GMT</pubDate><guid>http://www.aygfsteel.com/Jkallen/archive/2006/03/05/33671.html</guid><wfw:comment>http://www.aygfsteel.com/Jkallen/comments/33671.html</wfw:comment><comments>http://www.aygfsteel.com/Jkallen/archive/2006/03/05/33671.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/Jkallen/comments/commentRss/33671.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/Jkallen/services/trackbacks/33671.html</trackback:ping><description><![CDATA[     摘要: 在持久化q程中我们往往要用到存储一些大数据的操作,比如说用L靓照Q还有用L整个数据文g什么的啦!在oracle中提供了blog,clog{字D好象可以提供此功能呢(另外当然也可以直接放到如盘{其它存储设备上Q。就我个的h一些实践记下:1Q存放photoQ比如gif的二q制数据Q?//在一个字节数据中存放此gif文g的二q制数据InputStream in = ...  <a href='http://www.aygfsteel.com/Jkallen/archive/2006/03/05/33671.html'>阅读全文</a><img src ="http://www.aygfsteel.com/Jkallen/aggbug/33671.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/Jkallen/" target="_blank">Jkallen</a> 2006-03-05 11:49 <a href="http://www.aygfsteel.com/Jkallen/archive/2006/03/05/33671.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>Oracle中一些常用操?/title><link>http://www.aygfsteel.com/Jkallen/archive/2006/01/12/27655.html</link><dc:creator>Jkallen</dc:creator><author>Jkallen</author><pubDate>Wed, 11 Jan 2006 16:28:00 GMT</pubDate><guid>http://www.aygfsteel.com/Jkallen/archive/2006/01/12/27655.html</guid><wfw:comment>http://www.aygfsteel.com/Jkallen/comments/27655.html</wfw:comment><comments>http://www.aygfsteel.com/Jkallen/archive/2006/01/12/27655.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/Jkallen/comments/commentRss/27655.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/Jkallen/services/trackbacks/27655.html</trackback:ping><description><![CDATA[ <div id="wmqeeuq" class="postText"> <p> <font style="BACKGROUND-COLOR: #ffffff" color="#006400">ORACLE没有自动增长的数据类型,需要徏立一个自动增长的序列P插入记录时要把序列号的下一?br />D于此字段?/font> </p> <p> <font style="BACKGROUND-COLOR: #ffffff" color="#800080"> <font color="#006400">    CREATE SEQUENCE 序列L名称 (最好是表名+序列h? INCREMENT BY 1  START  WITH  1 <br />MAXVALUE  99999  CYCLE  NOCACHE;<br />    其中最大的值按字段的长度来? 如果定义的自动增长的序列?NUMBER(6) , 最大gؓ999999<br />    INSERT 语句插入q个字段gؓ: 序列L名称.NEXTVAL <br />   <br />     ?可以用如下的操作来对其进行操?<br />     </font> </font> </p> <div style="BORDER-RIGHT: #cccccc 1px solid; PADDING-RIGHT: 5px; BORDER-TOP: #cccccc 1px solid; PADDING-LEFT: 4px; FONT-SIZE: 13px; PADDING-BOTTOM: 4px; BORDER-LEFT: #cccccc 1px solid; WIDTH: 98%; WORD-BREAK: break-all; PADDING-TOP: 4px; BORDER-BOTTOM: #cccccc 1px solid; BACKGROUND-COLOR: #eeeeee"> <img src="http://www.aygfsteel.com/images/OutliningIndicators/None.gif" align="top" /> <span style="COLOR: #000000">String sqlSelectCID </span> <span style="COLOR: #000000">=</span> <span style="COLOR: #000000"> </span> <span style="COLOR: #000000">"</span> <span style="COLOR: #000000">Select CourseList_SEQ.nextval as Course_ID from dual</span> <span style="COLOR: #000000">"</span> <span style="COLOR: #000000">;<br /><img src="http://www.aygfsteel.com/images/OutliningIndicators/None.gif" align="top" />PreparedStatement stmtSelectCID;<br /><img src="http://www.aygfsteel.com/images/OutliningIndicators/None.gif" align="top" />stmtSelectCID </span> <span style="COLOR: #000000">=</span> <span style="COLOR: #000000"> conn.prepareStatement(sqlSelectCID)<br /><img src="http://www.aygfsteel.com/images/OutliningIndicators/None.gif" align="top" /></span> <span style="COLOR: #0000ff">synchronized</span> <span style="COLOR: #000000">(stmtSelectCID)<br /><img id="Codehighlighter1_196_258_Open_Image" onclick="this.style.display='none'; Codehighlighter1_196_258_Open_Text.style.display='none'; Codehighlighter1_196_258_Closed_Image.style.display='inline'; Codehighlighter1_196_258_Closed_Text.style.display='inline';" src="http://www.aygfsteel.com/images/OutliningIndicators/ExpandedBlockStart.gif" align="top" /><img id="Codehighlighter1_196_258_Closed_Image" style="DISPLAY: none" onclick="this.style.display='none'; Codehighlighter1_196_258_Closed_Text.style.display='none'; Codehighlighter1_196_258_Open_Image.style.display='inline'; Codehighlighter1_196_258_Open_Text.style.display='inline';" src="http://www.aygfsteel.com/images/OutliningIndicators/ContractedBlock.gif" align="top" />                    </span> <span id="Codehighlighter1_196_258_Closed_Text" style="BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; DISPLAY: none; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 1px solid; BACKGROUND-COLOR: #ffffff"> <img src="http://www.aygfsteel.com/images/dot.gif" /> </span> <span id="Codehighlighter1_196_258_Open_Text"> <span style="COLOR: #000000">{<br /><img src="http://www.aygfsteel.com/images/OutliningIndicators/InBlock.gif" align="top" />                        selectCourseIDRS </span> <span style="COLOR: #000000">=</span> <span style="COLOR: #000000"> stmtSelectCID.executeQuery();<br /><img src="http://www.aygfsteel.com/images/OutliningIndicators/ExpandedBlockEnd.gif" align="top" />                    }</span> </span> <span style="COLOR: #000000"> <br /> <img src="http://www.aygfsteel.com/images/OutliningIndicators/None.gif" align="top" />                    <br /><img src="http://www.aygfsteel.com/images/OutliningIndicators/None.gif" align="top" />                    </span> <span style="COLOR: #0000ff">if</span> <span style="COLOR: #000000">(</span> <span style="COLOR: #000000">!</span> <span style="COLOR: #000000">selectCourseIDRS.next())<br /><img id="Codehighlighter1_305_400_Open_Image" onclick="this.style.display='none'; Codehighlighter1_305_400_Open_Text.style.display='none'; Codehighlighter1_305_400_Closed_Image.style.display='inline'; Codehighlighter1_305_400_Closed_Text.style.display='inline';" src="http://www.aygfsteel.com/images/OutliningIndicators/ExpandedBlockStart.gif" align="top" /><img id="Codehighlighter1_305_400_Closed_Image" style="DISPLAY: none" onclick="this.style.display='none'; Codehighlighter1_305_400_Closed_Text.style.display='none'; Codehighlighter1_305_400_Open_Image.style.display='inline'; Codehighlighter1_305_400_Open_Text.style.display='inline';" src="http://www.aygfsteel.com/images/OutliningIndicators/ContractedBlock.gif" align="top" />                    </span> <span id="Codehighlighter1_305_400_Closed_Text" style="BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; DISPLAY: none; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 1px solid; BACKGROUND-COLOR: #ffffff"> <img src="http://www.aygfsteel.com/images/dot.gif" /> </span> <span id="Codehighlighter1_305_400_Open_Text"> <span style="COLOR: #000000">{<br /><img src="http://www.aygfsteel.com/images/OutliningIndicators/InBlock.gif" align="top" />                        </span> <span style="COLOR: #008000">//</span> <span style="COLOR: #008000">Update DB failed</span> <span style="COLOR: #008000"> <br /> <img src="http://www.aygfsteel.com/images/OutliningIndicators/InBlock.gif" align="top" /> </span> <span style="COLOR: #000000">                        stmtSelectCID.close();<br /><img src="http://www.aygfsteel.com/images/OutliningIndicators/InBlock.gif" align="top" />                        conn.close();<br /><img src="http://www.aygfsteel.com/images/OutliningIndicators/InBlock.gif" align="top" />                        </span> <span style="COLOR: #0000ff">return</span> <span style="COLOR: #000000">;<br /><img src="http://www.aygfsteel.com/images/OutliningIndicators/ExpandedBlockEnd.gif" align="top" />                    }</span> </span> <span style="COLOR: #000000"> <br /> <img src="http://www.aygfsteel.com/images/OutliningIndicators/None.gif" align="top" />                    setCourseID(selectCourseIDRS.getInt(</span> <span style="COLOR: #000000">"</span> <span style="COLOR: #000000">Course_ID</span> <span style="COLOR: #000000">"</span> <span style="COLOR: #000000">));</span> </div> <p> <br /> <br /> <font color="#ff0000">================================================================================</font> <br /> <br /> <font color="#006400">?SELECT SEQUENCE_NAME FROM USER_SEQUENCES;可以查看序列!<br /></font> <br /> <font color="#ff0000">================================================================================</font> <br /> <br /> <br /> <font color="#006400">在PL/SQL Developer?OR PL/SQL)的描qC:<br />(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=localhost)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=orcl)))<br /><br /><font color="#ff0000">================================================================================</font><br />在Oracle中显C日期,诸如Q?br />select to_char(last_day(current_date),'yyyy-mm')||'-'||'01' "本月初日?, to_char(last_day(current_date),'yyyy-mm-dd') "本月末日? from dual;<br /><br />昄l果Q?br /><br /><font color="#000000">本月初日?本月末日?br />---------- ----------<br />2006-01-01 2006-01-31</font><br /><font color="#ff0000">================================================================================</font><br /><br />单行字符串函数用于操作字W串数据Q他们大多数有一个或多个参数Q其中绝大多数返回字W串</font> </p> <p>  ascii()<br />  c1是一字符Ԍq回c1W一个字母的ascii码,他的逆函数是chr()<br />select ascii(''a'') big_a,ascii(''z'') big_z from empbig_a big_z65 122</p> <p>  chr(QiQ?[nchar_cs]<br />  i是一个数字,函数q回十进制表C的字符<br />select chr(65),chr(122),chr(223) from empchr65 chr122 chr223a z b</p> <p>  concat(,)<br />  c1,c2均ؓ字符Ԍ函数c2q接到c1的后面,如果c1为null,返回c2.如果c2为null,则返回c1Q如果c1、c2都ؓnullQ则q回null。他和操作符||q回的结果相?br />select concat(''slobo '',''svoboda'') username from dualusernameslobo syoboda</p> <p>  initcap()<br />  c1Z字符丌Ӏ函数将每个单词的第一个字母大写其它字母小写返回。单词由I格Q控制字W,标点W号限制?br />select initcap(''veni,vedi,vici'') ceasar from dualceasarveni,vedi,vici</p> <p>  instr(,[,QiQ[,]])<br />  c1,c2均ؓ字符Ԍi,j为整数。函数返回c2在c1中第jơ出现的位置Q搜索从c1的第i个字W开始。当没有发现需要的字符时返?,如果i敎ͼ那么搜烦从叛_左进行,但是位置的计还是从左到叻Ii和j的缺省gؓ1.<br />select instr(''mississippi'',''i'',3,3) from dualinstr(''mississippi'',''i'',3,3)11select instr(''mississippi'',''i'',-2,3) from dualinstr(''mississippi'',''i'',3,3)2</p> <p>  instrb(,[,i[,j])<br />  与instrQ)函数一P只是他返回的是字节,对于单字节instrb(){于instr()</p> <p>  length()<br />  c1为字W串Q返回c1的长度,如果c1为nullQ那么将q回null倹{?br />select length(''ipso facto'') ergo from dualergo10</p> <p>  lengthb()<br />  与length()一Pq回字节?/p> <p>  lower()<br />  q回c的小写字W,l常出现在where子串?br />select lower(colorname) from itemdetail where lower(colorname) like ''%white%''colornamewinterwhite</p> <p>  lpad(,QiQ[,])<br />  c1,c2均ؓ字符Ԍi为整数。在c1的左侧用c2字符串补长度i,可多ơ重复,如果i于c1的长度,那么只返回i那么长的c1字符Q其他的被截去。c2的缺省gؓ单空|参见rpad?br />select lpad(answer,7,'''') padded,answer unpadded from question;padded unpadded yes yesno nomaybe maybe</p> <p>  ltrim(,)<br />  把c1中最左边的字W去掉,使其W一个字W不在c2中,如果没有c2Q那么c1׃会改变?br />select ltrim(''mississippi'',''mis'') from dualltrppi</p> <p>  rpad(,QiQ[,]) <br />  在c1的右侧用c2字符串补长度i,可多ơ重复,如果i于c1的长度,那么只返回i那么长的c1字符Q其他的被截去。c2的缺省gؓ单空?其他与lpad怼</p> <p>  rtrim(,)<br />  把c1中最双的字W去掉,使其W后一个字W不在c2中,如果没有c2Q那么c1׃会改变?/p> <p>  replace(,[,])<br />  c1,c2,c3都是字符Ԍ函数用c3代替出现在c1中的c2后返回?br />select replace(''uptown'',''up'',''down'') from dualreplacedowntown</p> <p>  stbstr(,QiQ[,])<br />  c1Z字符Ԍi,j为整敎ͼ从c1的第i位开始返回长度ؓj的子字符Ԍ如果j为空Q则直到串的N?br />select substr(''message'',1,4) from dualsubsmess</p> <p>  substrb(,QiQ[,])<br />  与substr大致相同Q只是i,j是以字节计算?/p> <p>  soundex()<br />  q回与c1发音怼的词<br />select soundex(''dawes'') dawes soundex(''daws'') daws, soundex(''dawson'') from dualdawes daws dawsond200 d200 d250</p> <p>  translate(,,)<br />  c1中与c2相同的字W以c3代替<br />select translate(''fumble'',''uf'',''ar'') test from dualtextramble </p> <p>  trim([[]] from c3)<br />  c3串中的第一个,最后一个,或者都删除?br />select trim('' space padded '') trim from dual trimspace padded</p> <p>  upper()<br />  q回c1的大写,常出现where子串中select name from dual where upper(name) like ''ki%''nameking</p> </div> <img src ="http://www.aygfsteel.com/Jkallen/aggbug/27655.html" width = "1" height = "1" /><br><br><div 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