锘??xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:trackback="http://madskills.com/public/xml/rss/module/trackback/" xmlns:wfw="http://wellformedweb.org/CommentAPI/" xmlns:slash="http://purl.org/rss/1.0/modules/slash/"><channel><title>&#65;&#86;&#22312;&#32447;&#20122;&#27954;&#30007;&#20154;&#30340;&#22825;&#22530;&#44;&#50;&#48;&#49;&#57;&#20122;&#27954;&#21320;&#22812;&#26080;&#30721;&#22825;&#22530;&#44;&#20122;&#27954;&#22269;&#20135;&#25104;&#20154;&#36229;&#31119;&#21033;&#20037;&#20037;&#31934;&#21697;</title><link>http://www.tkk7.com/hobby8062/category/16780.html</link><description /><language>zh-cn</language><lastBuildDate>Wed, 28 Feb 2007 23:05:37 GMT</lastBuildDate><pubDate>Wed, 28 Feb 2007 23:05:37 GMT</pubDate><ttl>60</ttl><item><title>SQLServer鍜孫racle鐨勫父鐢ㄥ嚱鏁板姣?/title><link>http://www.tkk7.com/hobby8062/articles/78457.html</link><dc:creator>鍒樻氮</dc:creator><author>鍒樻氮</author><pubDate>Wed, 01 Nov 2006 05:15:00 GMT</pubDate><guid>http://www.tkk7.com/hobby8062/articles/78457.html</guid><wfw:comment>http://www.tkk7.com/hobby8062/comments/78457.html</wfw:comment><comments>http://www.tkk7.com/hobby8062/articles/78457.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.tkk7.com/hobby8062/comments/commentRss/78457.html</wfw:commentRss><trackback:ping>http://www.tkk7.com/hobby8062/services/trackbacks/78457.html</trackback:ping><description><![CDATA[
		<div   id="hjdrfjr"   class="diaryContent" id="diary1107666" style="DISPLAY: block">---------鏁板鍑芥暟 
<p>銆�銆�1.緇濆鍊?<br />銆�銆�S:select abs(-1) value<br />銆�銆�O:select abs(-1) value from dual</p><p>銆�銆�2.鍙栨暣(澶? <br />銆�銆�S:select ceiling(-1.001) value <br />銆�銆�O:select ceil(-1.001) value from dual</p><p>銆�銆�3.鍙栨暣錛堝皬錛?<br />銆�銆�S:select floor(-1.001) value <br />銆�銆�O:select floor(-1.001) value from dual</p><p>銆�銆�4.鍙栨暣錛堟埅鍙栵級<br />銆�銆�S:select cast(-1.002 as int) value <br />銆�銆�O:select trunc(-1.002) value from dual </p><p>銆�銆�5.鍥涜垗浜斿叆<br />銆�銆�S:select round(1.23456,4) value 1.23460<br />銆�銆�O:select round(1.23456,4) value from dual 1.2346</p><p>銆�銆�6.e涓哄簳鐨勫箓 <br />銆�銆�S:select Exp(1) value 2.7182818284590451 <br />銆�銆�O:select Exp(1) value from dual 2.71828182</p><p>銆�銆�7.鍙杄涓哄簳鐨勫鏁?br />銆�銆�S:select log(2.7182818284590451) value 1<br />銆�銆�O:select ln(2.7182818284590451) value from dual; 1</p><p>銆�銆�8.鍙?0涓哄簳瀵規暟<br />銆�銆�S:select log10(10) value 1<br />銆�銆�O:select log(10,10) value from dual; 1</p><br /><p>---------鏁板鍑芥暟 </p><p>銆�銆�1.緇濆鍊?<br />銆�銆�S:select abs(-1) value<br />銆�銆�O:select abs(-1) value from dual</p><p>銆�銆�2.鍙栨暣(澶? <br />銆�銆�S:select ceiling(-1.001) value <br />銆�銆�O:select ceil(-1.001) value from dual</p><p>銆�銆�3.鍙栨暣錛堝皬錛?<br />銆�銆�S:select floor(-1.001) value <br />銆�銆�O:select floor(-1.001) value from dual</p><p>銆�銆�4.鍙栨暣錛堟埅鍙栵級<br />銆�銆�S:select cast(-1.002 as int) value <br />銆�銆�O:select trunc(-1.002) value from dual </p><p>銆�銆�5.鍥涜垗浜斿叆<br />銆�銆�S:select round(1.23456,4) value 1.23460<br />銆�銆�O:select round(1.23456,4) value from dual 1.2346</p><p>銆�銆�6.e涓哄簳鐨勫箓 <br />銆�銆�S:select Exp(1) value 2.7182818284590451 <br />銆�銆�O:select Exp(1) value from dual 2.71828182</p><p>銆�銆�7.鍙杄涓哄簳鐨勫鏁?br />銆�銆�S:select log(2.7182818284590451) value 1<br />銆�銆�O:select ln(2.7182818284590451) value from dual; 1</p><p>銆�銆�8.鍙?0涓哄簳瀵規暟<br />銆�銆�S:select log10(10) value 1<br />銆�銆�O:select log(10,10) value from dual; 1</p><p>9.鍙栧鉤鏂?br />銆�銆�S:select SQUARE(4) value 16<br />銆�銆�O:select power(4,2) value from dual 16</p><p>銆�銆�10.鍙栧鉤鏂規牴<br />銆�銆�S:select SQRT(4) value 2<br />銆�銆�O:select SQRT(4) value from dual 2</p><p>銆�銆�11.姹備換鎰忔暟涓哄簳鐨勫箓<br />銆�銆�S:select power(3,4) value 81<br />銆�銆�O:select power(3,4) value from dual 81</p><p>銆�銆�12.鍙栭殢鏈烘暟<br />銆�銆�S:select rand() value <br />銆�銆�O:select sys.dbms_random.value(0,1) value from dual;</p><p>銆�銆�13.鍙栫鍙?br />銆�銆�S:select sign(-8) value -1<br />銆�銆�O:select sign(-8) value from dual -1<br />銆�銆�----------鏁板鍑芥暟</p><p>銆�銆�14.鍦嗗懆鐜?br />銆�銆�S:SELECT PI() value 3.1415926535897931<br />銆�銆�O:涓嶇煡閬?/p><p>銆�銆�15.sin,cos,tan 鍙傛暟閮戒互寮у害涓哄崟浣?br />銆�銆�渚嬪錛歴elect sin(PI()/2) value 寰楀埌1錛圫QLServer錛?/p><p>銆�銆�16.Asin,Acos,Atan,Atan2 榪斿洖寮у害</p><p>銆�銆�17.寮у害瑙掑害浜掓崲(SQLServer錛孫racle涓嶇煡閬?<br />銆�銆�DEGREES錛氬姬搴?銆夎搴?br />銆�銆�RADIANS錛氳搴?銆夊姬搴?/p><p>銆�銆�---------鏁板�奸棿姣旇緝</p><p>銆�銆�18. 姹傞泦鍚堟渶澶у�?br />銆�銆�S:select max(value) value from <br />銆�銆�(select 1 value<br />銆�銆�union<br />銆�銆�select -2 value<br />銆�銆�union<br />銆�銆�select 4 value<br />銆�銆�union<br />銆�銆�select 3 value)a</p><p>銆�銆�O:select greatest(1,-2,4,3) value from dual</p><p>銆�銆�19. 姹傞泦鍚堟渶灝忓�?br />銆�銆�S:select min(value) value from <br />銆�銆�(select 1 value<br />銆�銆�union<br />銆�銆�select -2 value<br />銆�銆�union<br />銆�銆�select 4 value<br />銆�銆�union<br />銆�銆�select 3 value)a</p><p>銆�銆�O:select least(1,-2,4,3) value from dual</p><p>銆�銆�20.濡備綍澶勭悊null鍊?F2涓殑null浠?0浠ｆ浛)<br />銆�銆�S:select F1,IsNull(F2,10) value from Tbl<br />銆�銆�O:select F1,nvl(F2,10) value from Tbl</p><p>銆�銆�--------鏁板�奸棿姣旇緝</p><p>銆�銆�21.姹傚瓧絎﹀簭鍙?br />銆�銆�S:select ascii('a') value<br />銆�銆�O:select ascii('a') value from dual</p><p>銆�銆�22.浠庡簭鍙鋒眰瀛楃<br />銆�銆�S:select char(97) value<br />銆�銆�O:select chr(97) value from dual</p><p>銆�銆�23.榪炴帴<br />銆�銆�S:select '11'+'22'+'33' value<br />銆�銆�O:select CONCAT('11','22')||33 value from dual</p><p>銆�銆�23.瀛愪覆浣嶇疆 --榪斿洖3<br />銆�銆�S:select CHARINDEX('s','sdsq',2) value <br />銆�銆�O:select INSTR('sdsq','s',2) value from dual</p><p>銆�銆�23.妯＄硦瀛愪覆鐨勪綅緗?--榪斿洖2,鍙傛暟鍘繪帀涓棿%鍒欒繑鍥?<br />銆�銆�S:select patindex('%d%q%','sdsfasdqe') value <br />銆�銆�O:oracle娌″彂鐜幫紝浣嗘槸instr鍙互閫氳繃絎洓闇鵑棶類ㄥ垈鐬ラ笨鎵ч棶?BR&gt;銆�銆�select INSTR('sdsfasdqe','sd',1,2) value from dual 榪斿洖6</p><p>銆�銆�24.姹傚瓙涓?br />銆�銆�S:select substring('abcd',2,2) value <br />銆�銆�O:select substr('abcd',2,2) value from dual</p><p>銆�銆�25.瀛愪覆浠ｆ浛 榪斿洖aijklmnef<br />銆�銆�S:SELECT STUFF('abcdef', 2, 3, 'ijklmn') value<br />銆�銆�O:SELECT Replace('abcdef', 'bcd', 'ijklmn') value from dual</p><p>銆�銆�26.瀛愪覆鍏ㄩ儴鏇挎崲<br />銆�銆�S:娌″彂鐜?br />銆�銆�O:select Translate('fasdbfasegas','fa','鎴? ) value from dual</p><p>銆�銆�27.闀垮害<br />銆�銆�S:len,datalength<br />銆�銆�O:length</p><p>銆�銆�28.澶у皬鍐欒漿鎹?lower,upper</p><p>銆�銆�29.鍗曡瘝棣栧瓧姣嶅ぇ鍐?br />銆�銆�S:娌″彂鐜?br />銆�銆�O:select INITCAP('abcd dsaf df') value from dual</p><p>銆�銆�30.宸﹁ˉ絀烘牸錛圠PAD鐨勭涓�涓弬鏁頒負絀烘牸鍒欏悓space鍑芥暟錛?br />銆�銆�S:select space(10)+'abcd' value<br />銆�銆�O:select LPAD('abcd',14) value from dual</p><p>銆�銆�31.鍙寵ˉ絀烘牸錛圧PAD鐨勭涓�涓弬鏁頒負絀烘牸鍒欏悓space鍑芥暟錛?br />銆�銆�S:select 'abcd'+space(10) value<br />銆�銆�O:select RPAD('abcd',14) value from dual</p><p>銆�銆�32.鍒犻櫎絀烘牸<br />銆�銆�S:ltrim,rtrim<br />銆�銆�O:ltrim,rtrim,trim</p><p>銆�銆�33. 閲嶅瀛楃涓?br />銆�銆�S:select REPLICATE('abcd',2) value <br />銆�銆�O:娌″彂鐜?/p><p>銆�銆�34.鍙戦煶鐩鎬技鎬ф瘮杈?榪欎袱涓崟璇嶈繑鍥炲�間竴鏍鳳紝鍙戦煶鐩稿悓)<br />銆�銆�S:SELECT SOUNDEX ('Smith'), SOUNDEX ('Smythe')<br />銆�銆�O:SELECT SOUNDEX ('Smith'), SOUNDEX ('Smythe') from dual<br />銆�銆�SQLServer涓敤SELECT DIFFERENCE('Smithers', 'Smythers') 姣旇緝soundex鐨勫樊<br />銆�銆�榪斿洖0-4錛?涓哄悓闊籌紝1鏈�楂?/p><p>銆�銆�--------------鏃ユ湡鍑芥暟</p><p>銆�銆�35.緋葷粺鏃墮棿<br />銆�銆�S:select getdate() value<br />銆�銆�O:select sysdate value from dual</p><p>銆�銆�36.鍓嶅悗鍑犳棩<br />銆�銆�鐩存帴涓庢暣鏁扮浉鍔犲噺</p><p>銆�銆�37.姹傛棩鏈?br />銆�銆�S:select convert(char(10),getdate(),20) value<br />銆�銆�O:select trunc(sysdate) value from dual<br />銆�銆�select to_char(sysdate,'yyyy-mm-dd') value from dual</p><p>銆�銆�38.姹傛椂闂?br />銆�銆�S:select convert(char(8),getdate(),108) value<br />銆�銆�O:select to_char(sysdate,'hh24:mm:ss') value from dual</p><p>銆�銆�39.鍙栨棩鏈熸椂闂寸殑鍏朵粬閮ㄥ垎<br />銆�銆�S:DATEPART 鍜?DATENAME 鍑芥暟 錛堢涓�涓弬鏁板喅瀹氾級 <br />銆�銆�O:to_char鍑芥暟 絎簩涓弬鏁板喅瀹?/p><p>銆�銆�鍙傛暟---------------------------------涓嬭〃闇�瑕佽ˉ鍏?br />銆�銆�year yy, yyyy <br />銆�銆�quarter qq, q (瀛ｅ害)<br />銆�銆�month mm, m (m O鏃犳晥)<br />銆�銆�dayofyear dy, y (O琛ㄦ槦鏈?<br />銆�銆�day dd, d (d O鏃犳晥)<br />銆�銆�week wk, ww (wk O鏃犳晥)<br />銆�銆�weekday dw (O涓嶆竻妤?<br />銆�銆�Hour hh,hh12,hh24 (hh12,hh24 S鏃犳晥)<br />銆�銆�minute mi, n (n O鏃犳晥)<br />銆�銆�second ss, s (s O鏃犳晥)<br />銆�銆�millisecond ms (O鏃犳晥)<br />銆�銆�----------------------------------------------</p><p>銆�銆�40.褰撴湀鏈�鍚庝竴澶?br />銆�銆�S:涓嶇煡閬?br />銆�銆�O:select LAST_DAY(sysdate) value from dual</p><p>銆�銆�41.鏈槦鏈熺殑鏌愪竴澶╋紙姣斿鏄熸湡鏃ワ級<br />銆�銆�S:涓嶇煡閬?br />銆�銆�O:SELECT Next_day(sysdate,7) vaule FROM DUAL;</p><p>銆�銆�42.瀛楃涓茶漿鏃墮棿<br />銆�銆�S:鍙互鐩存帴杞垨鑰卻elect cast('2004-09-08'as datetime) value<br />銆�銆�O:SELECT To_date('2004-01-05 22:09:38','yyyy-mm-dd hh24-mi-ss') vaule FROM DUAL;</p><p>銆�銆�43.姹備袱鏃ユ湡鏌愪竴閮ㄥ垎鐨勫樊錛堟瘮濡傜錛?br />銆�銆�S:select datediff(ss,getdate(),getdate()+12.3) value<br />銆�銆�O:鐩存帴鐢ㄤ袱涓棩鏈熺浉鍑忥紙姣斿d1-d2=12.3錛?br />銆�銆�SELECT (d1-d2)*24*60*60 vaule FROM DUAL;</p><p>銆�銆�44.鏍規嵁宸�兼眰鏂扮殑鏃ユ湡錛堟瘮濡傚垎閽燂級<br />銆�銆�S:select dateadd(mi,8,getdate()) value<br />銆�銆�O:SELECT sysdate+8/60/24 vaule FROM DUAL;</p><p>銆�銆�45.姹備笉鍚屾椂鍖烘椂闂?br />銆�銆�S:涓嶇煡閬?br />銆�銆�O:SELECT New_time(sysdate,'ydt','gmt' ) vaule FROM DUAL;</p><p>銆�銆�-----鏃跺尯鍙傛暟,鍖椾含鍦ㄤ笢8鍖哄簲璇ユ槸Ydt-------<br />銆�銆�AST ADT 澶цタ媧嬫爣鍑嗘椂闂?br />銆�銆�BST BDT 鐧戒護嫻鋒爣鍑嗘椂闂?br />銆�銆�CST CDT 涓儴鏍囧噯鏃墮棿<br />銆�銆�EST EDT 涓滈儴鏍囧噯鏃墮棿<br />銆�銆�GMT 鏍兼灄灝兼不鏍囧噯鏃墮棿<br />銆�銆�HST HDT 闃挎媺鏂姞鈥斿濞佸し鏍囧噯鏃墮棿<br />銆�銆�MST MDT 灞卞尯鏍囧噯鏃墮棿<br />銆�銆�NST 綰借姮鍏版爣鍑嗘椂闂?br />銆�銆�PST PDT 澶鉤媧嬫爣鍑嗘椂闂?br />銆�銆�YST YDT YUKON鏍囧噯鏃墮棿<br />銆�銆�---------------------------------------</p></div>
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