锘??xml version="1.0" encoding="utf-8" standalone="yes"?>亚洲一本一道一区二区三区,AV在线亚洲男人的天堂,国产精品国产亚洲精品看不卡http://www.tkk7.com/sy1214520/archive/2010/04/14/318287.html灝忚櫕鏃虹灝忚櫕鏃虹Wed, 14 Apr 2010 09:55:00 GMThttp://www.tkk7.com/sy1214520/archive/2010/04/14/318287.htmlhttp://www.tkk7.com/sy1214520/comments/318287.htmlhttp://www.tkk7.com/sy1214520/archive/2010/04/14/318287.html#Feedback0http://www.tkk7.com/sy1214520/comments/commentRss/318287.htmlhttp://www.tkk7.com/sy1214520/services/trackbacks/318287.html闃呰鍏ㄦ枃

灝忚櫕鏃虹 2010-04-14 17:55 鍙戣〃璇勮
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oracle鐨勬鍒欒〃杈懼紡http://www.tkk7.com/sy1214520/archive/2010/01/07/308540.html灝忚櫕鏃虹灝忚櫕鏃虹Thu, 07 Jan 2010 05:42:00 GMThttp://www.tkk7.com/sy1214520/archive/2010/01/07/308540.htmlhttp://www.tkk7.com/sy1214520/comments/308540.htmlhttp://www.tkk7.com/sy1214520/archive/2010/01/07/308540.html#Feedback0http://www.tkk7.com/sy1214520/comments/commentRss/308540.htmlhttp://www.tkk7.com/sy1214520/services/trackbacks/308540.html闃呰鍏ㄦ枃

灝忚櫕鏃虹 2010-01-07 13:42 鍙戣〃璇勮
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鎹鏄樋閲屽反宸村叕鍙窪BA絎旇瘯棰?杞紝闉瓥涓涓嬭嚜宸?http://www.tkk7.com/sy1214520/archive/2009/03/04/257858.html灝忚櫕鏃虹灝忚櫕鏃虹Wed, 04 Mar 2009 11:16:00 GMThttp://www.tkk7.com/sy1214520/archive/2009/03/04/257858.htmlhttp://www.tkk7.com/sy1214520/comments/257858.htmlhttp://www.tkk7.com/sy1214520/archive/2009/03/04/257858.html#Feedback0http://www.tkk7.com/sy1214520/comments/commentRss/257858.htmlhttp://www.tkk7.com/sy1214520/services/trackbacks/257858.html闃呰鍏ㄦ枃

灝忚櫕鏃虹 2009-03-04 19:16 鍙戣〃璇勮
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ORACLE 涓煡璇㈣〃瀛楁淇℃伅鐨勬柟娉?/title><link>http://www.tkk7.com/sy1214520/archive/2009/02/20/255869.html</link><dc:creator>灝忚櫕鏃虹</dc:creator><author>灝忚櫕鏃虹</author><pubDate>Fri, 20 Feb 2009 09:28:00 GMT</pubDate><guid>http://www.tkk7.com/sy1214520/archive/2009/02/20/255869.html</guid><wfw:comment>http://www.tkk7.com/sy1214520/comments/255869.html</wfw:comment><comments>http://www.tkk7.com/sy1214520/archive/2009/02/20/255869.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.tkk7.com/sy1214520/comments/commentRss/255869.html</wfw:commentRss><trackback:ping>http://www.tkk7.com/sy1214520/services/trackbacks/255869.html</trackback:ping><description><![CDATA[椹笂瑕佸仛淇℃伅鐭ヨ瘑搴撲簡錛屽彲鑳戒細鐢ㄥ埌榪欎釜涓滀笢錛屾彁浜ゅ啓濂斤紝鍒版椂鍊欐柟渚夸嬌鐢紙鏈榪戝疄鍦ㄦ槸澶繖浜?-_- 錛夊湪ORACLE鏁版嵁瀛楀吀瑙嗗浘user_tab_columns 涓彁渚涗簡琛ㄧ殑瀛楁璇︾粏淇℃伅 <p>鐢ㄥ涓嬭鍙ュ嵆鍙緱鍒板熀鏈殑淇℃伅</p> <p>select column_id, column_name, data_type, data_length, data_precision, data_scale,nullable,data_default from user_tab_columns where table_name = 'Tablename' order by column_id</p> <br /> 鍙﹀鍙兘鏈変竴涓渶姹備竴鐩存病鏈夋兂鍒板ソ鐨勮В鍐蟲柟妗堬紝甯屾湜鍝綅楂樻墜鑳藉鎻愪緵寤鴻錛?br /> 鎴戜滑瑕佹牴鎹紶鏉ョ殑鏁版嵁搴撹繛鎺ョ殑鍩烘湰淇℃伅錛屽幓榪炴帴鍒版暟鎹簮錛岀劧鍚庢牴鎹〃鍚嶏紝鏌ヨ鍑烘潵榪欏紶琛ㄧ殑緇撴瀯錛堜笂闈㈠凡緇忓仛浜嗭紝涓嶉毦錛夛紝鐒跺悗鍦ㄦ垜浠殑淇℃伅搴撲腑鏍規嵁璇ヨ〃緇撴瀯鍒涘緩琛ㄣ傚茍澶嶅埗鏁版嵁銆傚埌榪欎綅緗紝閮芥病鏈変粈涔堥毦鐨勶紝鍙槸鏂逛究澶у鐞嗚В銆?br /> 鍚庨潰鐨勪簨鎯呮槸榪欐牱錛屽湪鏌ヨ鍑烘潵鐨勬暟鎹簱淇℃伅涓紝闇瑕佹樉紺烘垚涓涓垪琛紝浣嗘槸鍏朵腑鏈夐儴鍒嗕笉鏄笟鍔′俊鎭紝鑰屾槸鍙︿竴寮犺〃鐨勫閿紝榪欎釜鏃朵警錛屾垜浠鍐嶆牴鎹繖涓閿潵鏌ヨ鍑烘潵鐩稿搴旂殑琛ㄧ殑淇℃伅銆傛湁鐐瑰儚鎶ヨ〃銆?br /> 鐤戞儜鐨勫湴鏂瑰湪浜庡鏋滄槸涓瀵逛竴鐨勶紝寰堢畝鍗曪紝鎶婅繖涓瓧孌典俊鎭仛鎴愪竴涓猽rl錛屽厛涓嶈冭檻鎬ц兘闂錛屾柟妗堟槸鍙鐨勩備絾鏄鏋滄槸涓瀵瑰鐨勬椂鍊欙紝灝變細姣旇緝楹葷儲銆? <img src ="http://www.tkk7.com/sy1214520/aggbug/255869.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.tkk7.com/sy1214520/" target="_blank">灝忚櫕鏃虹</a> 2009-02-20 17:28 <a href="http://www.tkk7.com/sy1214520/archive/2009/02/20/255869.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item><item><title>Oracle甯哥敤鍛戒護錛堝蹇橈級http://www.tkk7.com/sy1214520/archive/2008/12/22/247729.html灝忚櫕鏃虹灝忚櫕鏃虹Mon, 22 Dec 2008 03:56:00 GMThttp://www.tkk7.com/sy1214520/archive/2008/12/22/247729.htmlhttp://www.tkk7.com/sy1214520/comments/247729.htmlhttp://www.tkk7.com/sy1214520/archive/2008/12/22/247729.html#Feedback0http://www.tkk7.com/sy1214520/comments/commentRss/247729.htmlhttp://www.tkk7.com/sy1214520/services/trackbacks/247729.html闃呰鍏ㄦ枃

灝忚櫕鏃虹 2008-12-22 11:56 鍙戣〃璇勮
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Oracle鏁版嵁搴撶殑甯哥敤鍑芥暟鍒楄〃蹇熸煡鏀惰棌http://www.tkk7.com/sy1214520/archive/2008/11/10/239763.html灝忚櫕鏃虹灝忚櫕鏃虹Mon, 10 Nov 2008 15:42:00 GMThttp://www.tkk7.com/sy1214520/archive/2008/11/10/239763.htmlhttp://www.tkk7.com/sy1214520/comments/239763.htmlhttp://www.tkk7.com/sy1214520/archive/2008/11/10/239763.html#Feedback0http://www.tkk7.com/sy1214520/comments/commentRss/239763.htmlhttp://www.tkk7.com/sy1214520/services/trackbacks/239763.html 

鍑芥暟鏄竴縐嶆湁闆朵釜鎴栧涓弬鏁板茍涓旀湁涓涓繑鍥炲肩殑紼嬪簭銆傚湪SQL涓璒racle鍐呭緩浜嗕竴緋誨垪鍑芥暟錛岃繖浜涘嚱鏁伴兘鍙縐頒負SQL鎴朠L/SQL璇彞錛屽嚱鏁頒富瑕佸垎涓轟袱澶х被錛?

鍗曡鍑芥暟銆佺粍鍑芥暟

鏈枃灝嗚璁哄浣曞埄鐢ㄥ崟琛屽嚱鏁頒互鍙婁嬌鐢ㄨ鍒欍?

SQL涓殑鍗曡鍑芥暟

SQL鍜孭L/SQL涓嚜甯﹀緢澶氱被鍨嬬殑鍑芥暟錛屾湁瀛楃銆佹暟瀛椼佹棩鏈熴佽漿鎹€佸拰娣峰悎鍨嬬瓑澶氱鍑芥暟鐢ㄤ簬澶勭悊鍗曡鏁版嵁錛屽洜姝よ繖浜涢兘鍙緇熺О涓哄崟琛屽嚱鏁般傝繖浜涘嚱鏁板潎鍙敤浜嶴ELECT,WHERE銆丱RDER BY絳夊瓙鍙ヤ腑錛屼緥濡備笅闈㈢殑渚嬪瓙涓氨鍖呭惈浜員O_CHAR,UPPER,SOUNDEX絳夊崟琛屽嚱鏁般?

 

SELECT ename,TO_CHAR(hiredate,'day,DD-Mon-YYYY')FROM empWhere
                        UPPER(ename) Like 'AL%'ORDER BY SOUNDEX(ename)

鍗曡鍑芥暟涔熷彲浠ュ湪鍏朵粬璇彞涓嬌鐢紝濡倁pdate鐨凷ET瀛愬彞錛孖NSERT鐨刅ALUES瀛愬彞錛孌ELET鐨刉HERE瀛愬彞,璁よ瘉鑰冭瘯鐗瑰埆娉ㄦ剰鍦⊿ELECT璇彞涓嬌鐢ㄨ繖浜涘嚱鏁幫紝鎵浠ユ垜浠殑娉ㄦ剰鍔涗篃闆嗕腑鍦⊿ELECT璇彞涓?

NULL鍜屽崟琛屽嚱鏁?/strong>

鍦ㄥ浣曠悊瑙ULL涓婂紑濮嬫槸寰堝洶闅劇殑錛屽氨綆楁槸涓涓緢鏈夌粡楠岀殑浜轟緷鐒跺姝ゆ劅鍒板洶鎯戙侼ULL鍊艱〃紺轟竴涓湭鐭ユ暟鎹垨鑰呬竴涓┖鍊鹼紝綆楁湳鎿嶄綔絎︾殑浠諱綍涓涓搷浣滄暟涓篘ULL鍊鹼紝緇撴灉鍧囦負鎻愪釜NULL鍊?榪欎釜瑙勫垯涔熼傚悎寰堝鍑芥暟錛屽彧鏈塁ONCAT,DECODE,DUMP,NVL,REPLACE鍦ㄨ皟鐢ㄤ簡NULL鍙傛暟鏃惰兘澶熻繑鍥為潪NULL鍊箋傚湪榪欎簺涓璑VL鍑芥暟鏃舵渶閲嶈鐨勶紝鍥犱負浠栬兘鐩存帴澶勭悊NULL鍊鹼紝NVL鏈変袱涓弬鏁幫細NVL(x1,x2),x1鍜寈2閮藉紡琛ㄨ揪寮忥紝褰搙1涓簄ull鏃惰繑鍥瀀2,鍚﹀垯榪斿洖x1銆?

涓嬮潰鎴戜滑鐪嬬湅emp鏁版嵁琛ㄥ畠鍖呭惈浜嗚柂姘淬佸閲戜袱欏癸紝闇瑕佽綆楁葷殑琛ュ伩

 

column name emp_id salary bonuskey type pk nulls/unique nn,
                        u nnfk table datatype number number numberlength 11.2 11.2

涓嶆槸綆鍗曠殑灝嗚柂姘村拰濂栭噾鍔犺搗鏉ュ氨鍙互浜嗭紝濡傛灉鏌愪竴琛屾槸null鍊奸偅涔堢粨鏋滃氨灝嗘槸null錛屾瘮濡備笅闈㈢殑渚嬪瓙錛?

 

update empset salary=(salary+bonus)*1.1

榪欎釜璇彞涓紝闆囧憳鐨勫伐璧勫拰濂栭噾閮藉皢鏇存柊涓轟竴涓柊鐨勫鹼紝浣嗘槸濡傛灉娌℃湁濂栭噾錛屽嵆 salary + null,閭d箞灝變細寰楀嚭閿欒鐨勭粨璁猴紝榪欎釜鏃跺欏氨瑕佷嬌鐢╪vl鍑芥暟鏉ユ帓闄ull鍊肩殑褰卞搷銆?

鎵浠ユ紜殑璇彞鏄細

 

update empset salary=(salary+nvl(bonus,0)*1.1

鍗曡瀛楃涓插嚱鏁?/strong>

鍗曡瀛楃涓插嚱鏁扮敤浜庢搷浣滃瓧絎︿覆鏁版嵁錛屼粬浠ぇ澶氭暟鏈変竴涓垨澶氫釜鍙傛暟錛屽叾涓粷澶у鏁拌繑鍥炲瓧絎︿覆

ASCII()

c1鏄竴瀛楃涓詫紝榪斿洖c1絎竴涓瓧姣嶇殑ASCII鐮侊紝浠栫殑閫嗗嚱鏁版槸CHR()

 

SELECT ASCII('A') BIG_A,ASCII('z') BIG_z FROM empBIG_A BIG_z65 122

CHR(錛渋錛?[NCHAR_CS]

i鏄竴涓暟瀛楋紝鍑芥暟榪斿洖鍗佽繘鍒惰〃紺虹殑瀛楃

 

select CHR(65),CHR(122),CHR(223) FROM empCHR65 CHR122 CHR223A z B

CONCAT(,)

c1,c2鍧囦負瀛楃涓詫紝鍑芥暟灝哻2榪炴帴鍒癱1鐨勫悗闈紝濡傛灉c1涓簄ull,灝嗚繑鍥瀋2.濡傛灉c2涓簄ull,鍒欒繑鍥瀋1錛屽鏋渃1銆乧2閮戒負null錛屽垯榪斿洖null銆備粬鍜屾搷浣滅||榪斿洖鐨勭粨鏋滅浉鍚?

 

select concat('slobo ','Svoboda') username from dualusernameslobo Syoboda

INITCAP()

c1涓轟竴瀛楃涓層傚嚱鏁板皢姣忎釜鍗曡瘝鐨勭涓涓瓧姣嶅ぇ鍐欏叾瀹冨瓧姣嶅皬鍐欒繑鍥炪傚崟璇嶇敱絀烘牸錛屾帶鍒跺瓧絎︼紝鏍囩偣絎﹀彿闄愬埗銆?

 

select INITCAP('veni,vedi,vici') Ceasar from dualCeasarVeni,Vedi,Vici

INSTR(,[,錛渋錛瀃,]])

c1,c2鍧囦負瀛楃涓詫紝i,j涓烘暣鏁般傚嚱鏁拌繑鍥瀋2鍦╟1涓j嬈″嚭鐜扮殑浣嶇疆錛屾悳绱粠c1鐨勭i涓瓧絎﹀紑濮嬨傚綋娌℃湁鍙戠幇闇瑕佺殑瀛楃鏃惰繑鍥?,濡傛灉i涓鴻礋鏁幫紝閭d箞鎼滅儲灝嗕粠鍙沖埌宸﹁繘琛岋紝浣嗘槸浣嶇疆鐨勮綆楄繕鏄粠宸﹀埌鍙籌紝i鍜宩鐨勭己鐪佸間負1.

 

select INSTR('Mississippi','i',3,3)
                        from dualINSTR('MISSISSIPPI','I',3,3)11
                        select INSTR('Mississippi','i',-2,3)
                        from dualINSTR('MISSISSIPPI','I',3,3)2

INSTRB(,[,i[,j])

涓嶪NSTR錛堬級鍑芥暟涓鏍鳳紝鍙槸浠栬繑鍥炵殑鏄瓧鑺傦紝瀵逛簬鍗曞瓧鑺侷NSTRB()絳変簬INSTR()

LENGTH()

c1涓哄瓧絎︿覆錛岃繑鍥瀋1鐨勯暱搴︼紝濡傛灉c1涓簄ull錛岄偅涔堝皢榪斿洖null鍊箋?

 

select LENGTH('Ipso Facto') ergo from dualergo10

LENGTHb()

涓嶭ENGTH()涓鏍鳳紝榪斿洖瀛楄妭銆?

lower()

榪斿洖c鐨勫皬鍐欏瓧絎︼紝緇忓父鍑虹幇鍦╳here瀛愪覆涓?

 

select LOWER(colorname) from itemdetail WHERE LOWER(colorname) LIKE '%white%'COLORNAMEWinterwhite

LPAD(,錛渋錛瀃,])

c1,c2鍧囦負瀛楃涓詫紝i涓烘暣鏁般傚湪c1鐨勫乏渚х敤c2瀛楃涓茶ˉ瓚寵嚧闀垮害i,鍙嬈¢噸澶嶏紝濡傛灉i灝忎簬c1鐨勯暱搴︼紝閭d箞鍙繑鍥瀒閭d箞闀跨殑c1瀛楃錛屽叾浠栫殑灝嗚鎴幓銆俢2鐨勭己鐪佸間負鍗曠┖鏍鹼紝鍙傝RPAD銆?

 

select LPAD(answer,7,'') padded,answer unpadded from question;
                        PADDED UNPADDED Yes YesNO NOMaybe maybe

LTRIM(,)

鎶奵1涓渶宸﹁竟鐨勫瓧絎﹀幓鎺夛紝浣垮叾絎竴涓瓧絎︿笉鍦╟2涓紝濡傛灉娌℃湁c2錛岄偅涔坈1灝變笉浼氭敼鍙樸?

 

select LTRIM('Mississippi','Mis') from dualLTRppi

RPAD(,錛渋錛瀃,])

鍦╟1鐨勫彸渚х敤c2瀛楃涓茶ˉ瓚寵嚧闀垮害i,鍙嬈¢噸澶嶏紝濡傛灉i灝忎簬c1鐨勯暱搴︼紝閭d箞鍙繑鍥瀒閭d箞闀跨殑c1瀛楃錛屽叾浠栫殑灝嗚鎴幓銆俢2鐨勭己鐪佸間負鍗曠┖鏍?鍏朵粬涓嶭PAD鐩鎬技

RTRIM(,)

鎶奵1涓渶鍙寵竟鐨勫瓧絎﹀幓鎺夛紝浣垮叾絎悗涓涓瓧絎︿笉鍦╟2涓紝濡傛灉娌℃湁c2錛岄偅涔坈1灝變笉浼氭敼鍙樸?

REPLACE(,[,])

c1,c2,c3閮芥槸瀛楃涓詫紝鍑芥暟鐢╟3浠f浛鍑虹幇鍦╟1涓殑c2鍚庤繑鍥炪?

 

select REPLACE('uptown','up','down') from dualREPLACEdowntown

STBSTR(,錛渋錛瀃,])

c1涓轟竴瀛楃涓詫紝i,j涓烘暣鏁幫紝浠巆1鐨勭i浣嶅紑濮嬭繑鍥為暱搴︿負j鐨勫瓙瀛楃涓詫紝濡傛灉j涓虹┖錛屽垯鐩村埌涓茬殑灝鵑儴銆?

 

select SUBSTR('Message',1,4) from dualSUBSMess

SUBSTRB(,錛渋錛瀃,])

涓嶴UBSTR澶ц嚧鐩稿悓錛屽彧鏄疘,J鏄互瀛楄妭璁$畻銆?

SOUNDEX()

榪斿洖涓巆1鍙戦煶鐩鎬技鐨勮瘝

 

select SOUNDEX('dawes') Dawes SOUNDEX('daws') Daws,
                        SOUNDEX('dawson') from dualDawes Daws DawsonD200 D200 D250

TRANSLATE(,,)

灝哻1涓笌c2鐩稿悓鐨勫瓧絎︿互c3浠f浛

 

select TRANSLATE('fumble','uf','ar') test from dualTEXTramble

TRIM([[]] from c3)

灝哻3涓蹭腑鐨勭涓涓紝鏈鍚庝竴涓紝鎴栬呴兘鍒犻櫎銆?

 

select TRIM(' space padded ') trim from dual TRIMspace padded

UPPER()

榪斿洖c1鐨勫ぇ鍐欙紝甯稿嚭鐜皐here瀛愪覆涓?

 

select name from dual where UPPER(name) LIKE 'KI%'NAMEKING

鍗曡鏁板瓧鍑芥暟

鍗曡鏁板瓧鍑芥暟鎿嶄綔鏁板瓧鏁版嵁錛屾墽琛屾暟瀛﹀拰綆楁湳榪愮畻銆傛墍鏈夊嚱鏁伴兘鏈夋暟瀛楀弬鏁板茍榪斿洖鏁板瓧鍊箋傛墍鏈変笁瑙掑嚱鏁扮殑鎿嶄綔鏁板拰鍊奸兘鏄姬搴﹁屼笉鏄搴︼紝oracle娌℃湁鎻愪緵鍐呭緩鐨勫姬搴﹀拰瑙掑害鐨勮漿鎹㈠嚱鏁般?

 

ABS()

榪斿洖n鐨勭粷瀵瑰?

ACOS()

鍙嶄綑鐜勫嚱鏁幫紝榪斿洖-1鍒?涔嬮棿鐨勬暟銆俷琛ㄧず寮у害

 

select ACOS(-1) pi,ACOS(1) ZERO FROM dualPI ZERO3.14159265 0

ASIN()

鍙嶆鐜勫嚱鏁幫紝榪斿洖-1鍒?錛宯琛ㄧず寮у害

ATAN()

鍙嶆鍒囧嚱鏁幫紝榪斿洖n鐨勫弽姝e垏鍊鹼紝n琛ㄧず寮у害銆?

CEIL()

榪斿洖澶т簬鎴栫瓑浜巒鐨勬渶灝忔暣鏁般?

COS()

榪斿洖n鐨勪綑鐜勫鹼紝n涓哄姬搴?

COSH()

榪斿洖n鐨勫弻鏇蹭綑鐜勫鹼紝n 涓烘暟瀛椼?

 

select COSH(<1.4>) FROM dualCOSH(1.4)2.15089847

EXP()

榪斿洖e鐨刵嬈″箓錛宔=2.71828183.

FLOOR()

榪斿洖灝忎簬絳変簬N鐨勬渶澶ф暣鏁般?

LN()

榪斿洖N鐨勮嚜鐒跺鏁幫紝N蹇呴』澶т簬0

LOG(,)

榪斿洖浠1涓哄簳n2鐨勫鏁?

MOD()

榪斿洖n1闄や互n2鐨勪綑鏁幫紝

POWER(,)

榪斿洖n1鐨刵2嬈℃柟

ROUND(,)

榪斿洖鑸嶅叆灝忔暟鐐瑰彸杈筺2浣嶇殑n1鐨勫鹼紝n2鐨勭己鐪佸間負0錛岃繖鍥炲皢灝忔暟鐐規渶鎺ヨ繎鐨勬暣鏁幫紝濡傛灉n2涓鴻礋鏁板氨鑸嶅叆鍒板皬鏁扮偣宸﹁竟鐩稿簲鐨勪綅涓婏紝n2蹇呴』鏄暣鏁般?

 

select ROUND(12345,-2),ROUND(12345.54321,2)
            FROM dualROUND(12345,-2) ROUND(12345.54321,2)12300 12345.54

SIGN()

濡傛灉n涓鴻礋鏁幫紝榪斿洖-1,濡傛灉n涓烘鏁幫紝榪斿洖1錛屽鏋渘=0榪斿洖0.

SIN錛?

榪斿洖n鐨勬鐜勫?n涓哄姬搴︺?

SINH()

榪斿洖n鐨勫弻鏇叉鐜勫?n涓哄姬搴︺?

SQRT()

榪斿洖n鐨勫鉤鏂規牴,n涓哄姬搴?

TAN錛?

榪斿洖n鐨勬鍒囧?n涓哄姬搴?

TANH()

榪斿洖n鐨勫弻鏇叉鍒囧?n涓哄姬搴?

TRUNC(,)

榪斿洖鎴熬鍒皀2浣嶅皬鏁扮殑n1鐨勫鹼紝n2緙虹渷璁劇疆涓?錛屽綋n2涓虹己鐪佽緗椂浼氬皢n1鎴熬涓烘暣鏁幫紝濡傛灉n2涓鴻礋鍊鹼紝灝辨埅灝懼湪灝忔暟鐐瑰乏杈圭浉搴旂殑浣嶄笂銆?/p>

鍗曡鏃ユ湡鍑芥暟

鍗曡鏃ユ湡鍑芥暟鎿嶄綔DATA鏁版嵁綾誨瀷錛岀粷澶у鏁伴兘鏈塂ATA鏁版嵁綾誨瀷鐨勫弬鏁幫紝緇濆ぇ澶氭暟榪斿洖鐨勪篃鏄疍ATA鏁版嵁綾誨瀷鐨勫箋?

ADD_MONTHS(,錛渋錛?

榪斿洖鏃ユ湡d鍔犱笂i涓湀鍚庣殑緇撴灉銆俰鍙互浣夸換鎰忔暣鏁般傚鏋渋鏄竴涓皬鏁幫紝閭d箞鏁版嵁搴撳皢闅愬紡鐨勪粬杞崲鎴愭暣鏁幫紝灝嗕細鎴幓灝忔暟鐐瑰悗闈㈢殑閮ㄥ垎銆?

LAST_DAY()

鍑芥暟榪斿洖鍖呭惈鏃ユ湡d鐨勬湀浠界殑鏈鍚庝竴澶?

MONTHS_BETWEEN(,)

榪斿洖d1鍜宒2涔嬮棿鏈堢殑鏁扮洰,濡傛灉d1鍜宒2鐨勬棩鐨勬棩鏈熼兘鐩稿悓錛屾垨鑰呴兘浣胯鏈堢殑鏈鍚庝竴澶╋紝閭d箞灝嗚繑鍥炰竴涓暣鏁幫紝鍚﹀垯浼氳繑鍥炵殑緇撴灉灝嗗寘鍚竴涓垎鏁般?

NEW_TIME(,,)

d1鏄竴涓棩鏈熸暟鎹被鍨嬶紝褰撴椂鍖簍z1涓殑鏃ユ湡鍜屾椂闂存槸d鏃訛紝榪斿洖鏃跺尯tz2涓殑鏃ユ湡鍜屾椂闂淬倀z1鍜宼z2鏃跺瓧絎︿覆銆?

NEXT_DAY(,)

榪斿洖鏃ユ湡d鍚庣敱dow緇欏嚭鐨勬潯浠剁殑絎竴澶╋紝dow浣跨敤褰撳墠浼氳瘽涓粰鍑虹殑璇█鎸囧畾浜嗕竴鍛ㄤ腑鐨勬煇涓澶╋紝榪斿洖鐨勬椂闂村垎閲忎笌d鐨勬椂闂村垎閲忕浉鍚屻?

select NEXT_DAY('01-Jan-2000'

 

,'Monday') "1st Monday",
            NEXT_DAY('01-Nov-2004','Tuesday')+7 "2nd Tuesday")
            from dual;1st Monday 2nd Tuesday03-Jan-2000 09-Nov-2004

ROUND([,])

灝嗘棩鏈焏鎸夌収fmt鎸囧畾鐨勬牸寮忚垗鍏ワ紝fmt涓哄瓧絎︿覆銆?

SYADATE

鍑芥暟娌℃湁鍙傛暟錛岃繑鍥炲綋鍓嶆棩鏈熷拰鏃墮棿銆?

TRUNC([,])

榪斿洖鐢眆mt鎸囧畾鐨勫崟浣嶇殑鏃ユ湡d.

鍗曡杞崲鍑芥暟

鍗曡杞崲鍑芥暟鐢ㄤ簬鎿嶄綔澶氭暟鎹被鍨嬶紝鍦ㄦ暟鎹被鍨嬩箣闂磋繘琛岃漿鎹€?

CHARTORWID()

c 浣夸竴涓瓧絎︿覆錛屽嚱鏁板皢c杞崲涓篟WID鏁版嵁綾誨瀷銆?

 

SELECT test_id from test_case where rowid=CHARTORWID('AAAA0SAACAAAALiAAA')

CONVERT(,[,])

c灝懼瓧絎︿覆錛宒set銆乻set鏄袱涓瓧絎﹂泦錛屽嚱鏁板皢瀛楃涓瞔鐢眘set瀛楃闆嗚漿鎹負dset瀛楃闆嗭紝sset鐨勭己鐪佽緗負鏁版嵁搴撶殑瀛楃闆嗐?

HEXTORAW()

x涓?6榪涘埗鐨勫瓧絎︿覆錛屽嚱鏁板皢16榪涘埗鐨剎杞崲涓篟AW鏁版嵁綾誨瀷銆?

RAWTOHEX()

x鏄疪AW鏁版嵁綾誨瀷瀛楃涓詫紝鍑芥暟灝哛AW鏁版嵁綾昏漿鎹負16榪涘埗鐨勬暟鎹被鍨嬨?

ROWIDTOCHAR()

鍑芥暟灝哛OWID鏁版嵁綾誨瀷杞崲涓篊HAR鏁版嵁綾誨瀷銆?

TO_CHAR([[,)

x鏄竴涓猟ata鎴杗umber鏁版嵁綾誨瀷錛屽嚱鏁板皢x杞崲鎴恌mt鎸囧畾鏍煎紡鐨刢har鏁版嵁綾誨瀷錛屽鏋渪涓烘棩鏈焠lsparm=NLS_DATE_LANGUAGE 鎺у埗榪斿洖鐨勬湀浠藉拰鏃ヤ喚鎵浣跨敤鐨勮璦銆傚鏋渪涓烘暟瀛梟lsparm=NLS_NUMERIC_CHARACTERS 鐢ㄦ潵鎸囧畾灝忔暟浣嶅拰鍗冨垎浣嶇殑鍒嗛殧絎︼紝浠ュ強璐у竵絎﹀彿銆?

 

NLS_NUMERIC_CHARACTERS ="dg", NLS_CURRENCY="string"

TO_DATE([,[,錛?

c琛ㄧず瀛楃涓詫紝fmt琛ㄧず涓縐嶇壒孌婃牸寮忕殑瀛楃涓層傝繑鍥炴寜鐓mt鏍煎紡鏄劇ず鐨刢,nlsparm琛ㄧず浣跨敤鐨勮璦銆傚嚱鏁板皢瀛楃涓瞔杞崲鎴恉ate鏁版嵁綾誨瀷銆?

TO_MULTI_BYTE()

c琛ㄧず涓涓瓧絎︿覆錛屽嚱鏁板皢c鐨勬媴瀛愭埅瀛楃杞崲鎴愬瀛楄妭瀛楃銆?

TO_NUMBER([,[,)

c琛ㄧず瀛楃涓詫紝fmt琛ㄧず涓涓壒孌婃牸寮忕殑瀛楃涓詫紝鍑芥暟榪斿洖鍊兼寜鐓mt鎸囧畾鐨勬牸寮忔樉紺恒俷lsparm琛ㄧず璇█錛屽嚱鏁板皢榪斿洖c浠h〃鐨勬暟瀛椼?

TO_SINGLE_BYTE()

灝嗗瓧絎︿覆c涓緱澶氬瓧鑺傚瓧絎﹁漿鍖栨垚絳変環鐨勫崟瀛楄妭瀛楃銆傝鍑芥暟浠呭綋鏁版嵁搴撳瓧絎﹂泦鍚屾椂鍖呭惈鍗曞瓧鑺傚拰澶氬瓧鑺傚瓧絎︽椂鎵嶄嬌鐢?/p>

鍏跺畠鍗曡鍑芥暟

BFILENAME( ,)

dir鏄竴涓猟irectory綾誨瀷鐨勫璞★紝file涓轟竴鏂囦歡鍚嶃傚嚱鏁拌繑鍥炰竴涓┖鐨凚FILE浣嶇疆鍊兼寚紺虹錛屽嚱鏁扮敤浜庡垵濮嬪寲BFILE鍙橀噺鎴栬呮槸BFILE鍒椼?

DECODE(,,[,,,[])

x鏄竴涓〃杈懼紡錛宮1鏄竴涓尮閰嶈〃杈懼紡錛寈涓巑1姣旇緝錛屽鏋渕1絳変簬x錛岄偅涔堣繑鍥瀝1,鍚﹀垯,x涓巑2姣旇緝錛屼緷嬈$被鎺╩3,m4,m5....鐩村埌鏈夎繑鍥炵粨鏋溿?

DUMP(,[,[,[,]]])

x鏄竴涓〃杈懼紡鎴栧瓧絎︼紝fmt琛ㄧず8榪涘埗銆?0榪涘埗銆?6榪涘埗銆佹垨鍒欏崟瀛楃銆傚嚱鏁拌繑鍥炲寘鍚簡鏈夊叧x鐨勫唴閮ㄨ〃紺轟俊鎭殑VARCHAR2綾誨瀷鐨勫箋傚鏋滄寚瀹氫簡n1,n2閭d箞浠巒1寮濮嬬殑闀垮害涓簄2鐨勫瓧鑺傚皢琚繑鍥炪?

EMPTY_BLOB()

璇ュ嚱鏁版病鏈夊弬鏁幫紝鍑芥暟榪斿洖 涓涓┖鐨凚LOB浣嶇疆鎸囩ず絎︺傚嚱鏁扮敤浜庡垵濮嬪寲涓涓狟LOB鍙橀噺鎴朆LOB鍒椼?

EMPTY_CLOB()

璇ュ嚱鏁版病鏈夊弬鏁幫紝鍑芥暟榪斿洖 涓涓┖鐨凜LOB浣嶇疆鎸囩ず絎︺傚嚱鏁扮敤浜庡垵濮嬪寲涓涓狢LOB鍙橀噺鎴朇LOB鍒椼?

GREATEST()

exp_list鏄竴鍒楄〃杈懼紡錛岃繑鍥炲叾涓渶澶х殑琛ㄨ揪寮忥紝姣忎釜琛ㄨ揪寮忛兘琚殣鍚殑杞崲絎竴涓〃杈懼紡鐨勬暟鎹被鍨嬶紝濡傛灉絎竴涓〃杈懼紡鏄瓧絎︿覆鏁版嵁綾誨瀷涓殑浠諱綍涓涓紝閭d箞榪斿洖鐨勭粨鏋滄槸varchar2鏁版嵁綾誨瀷錛屽悓鏃朵嬌鐢ㄧ殑姣旇緝鏄潪濉厖絀烘牸綾誨瀷鐨勬瘮杈冦?

LEAST()

exp_list鏄竴鍒楄〃杈懼紡錛岃繑鍥炲叾涓渶灝忕殑琛ㄨ揪寮忥紝姣忎釜琛ㄨ揪寮忛兘琚殣鍚殑杞崲絎竴涓〃杈懼紡鐨勬暟鎹被鍨嬶紝濡傛灉絎竴涓〃杈懼紡鏄瓧絎︿覆鏁版嵁綾誨瀷涓殑浠諱綍涓涓紝灝嗚繑鍥炵殑緇撴灉鏄痸archar2鏁版嵁綾誨瀷錛屽悓鏃朵嬌鐢ㄧ殑姣旇緝鏄潪濉厖絀烘牸綾誨瀷鐨勬瘮杈冦?

UID

璇ュ嚱鏁版病鏈夊弬鏁幫紝榪斿洖鍞竴鏍囩ず褰撳墠鏁版嵁搴撶敤鎴風殑鏁存暟銆?

USER

榪斿洖褰撳墠鐢ㄦ埛鐨勭敤鎴峰悕

USERENV()

鍩轟簬opt榪斿洖鍖呭惈褰撳墠浼氳瘽淇℃伅銆俹pt鐨勫彲閫夊間負錛?

ISDBA銆 銆銆浼氳瘽涓璖YSDBA鑴氳壊鍝嶅簲錛岃繑鍥濼RUE

SESSIONID 銆榪斿洖瀹¤浼氳瘽鏍囩ず絎?

ENTRYID 銆銆榪斿洖鍙敤鐨勫璁¢」鏍囩ず絎?

INSTANCE銆銆鍦ㄤ細璇濊繛鎺ュ悗錛岃繑鍥炲疄渚嬫爣紺虹銆傝鍊煎彧鐢ㄤ簬榪愯Parallel 鏈嶅姟鍣ㄥ茍涓旀湁 澶氫釜瀹炰緥鐨勬儏鍐典笅浣跨敤銆?

LANGUAGE銆銆榪斿洖璇█銆佸湴鍩熴佹暟鎹簱璁劇疆鐨勫瓧絎﹂泦銆?

LANG銆銆銆銆榪斿洖璇█鍚嶇О鐨処SO緙╁啓銆?

TERMINAL銆銆涓哄綋鍓嶄細璇濅嬌鐢ㄧ殑緇堢鎴栬綆楁満榪斿洖鎿嶄綔緋葷粺鐨勬爣紺虹銆?

VSIZE()

x鏄竴涓〃杈懼紡銆傝繑鍥瀤鍐呴儴琛ㄧず鐨勫瓧鑺傛暟銆?

SQL涓殑緇勫嚱鏁?/strong>

緇勫嚱鏁頒篃鍙泦鍚堝嚱鏁幫紝榪斿洖鍩轟簬澶氫釜琛岀殑鍗曚竴緇撴灉錛岃鐨勫噯紜暟閲忔棤娉曠‘瀹氾紝闄ら潪鏌ヨ琚墽琛屽茍涓旀墍鏈夌殑緇撴灉閮借鍖呭惈鍦ㄥ唴銆備笌鍗曡鍑芥暟涓嶅悓鐨勬槸錛屽湪瑙f瀽鏃舵墍鏈夌殑琛岄兘鏄凡鐭ョ殑銆傜敱浜庤繖縐嶅樊鍒嬌緇勫嚱鏁頒笌鍗曡鍑芥暟鏈夊湪瑕佹眰鍜岃涓轟笂鏈夊井灝忕殑宸紓.

緇勶紙澶氳錛夊嚱鏁?/strong>

涓庡崟琛屽嚱鏁扮浉姣旓紝oracle鎻愪緵浜嗕赴瀵岀殑鍩轟簬緇勭殑錛屽琛岀殑鍑芥暟銆傝繖浜涘嚱鏁板彲浠ュ湪select鎴杝elect鐨刪aving瀛愬彞涓嬌鐢紝褰撶敤浜巗elect瀛愪覆鏃跺父甯擱兘鍜孏ROUP BY涓璧蜂嬌鐢ㄣ?

AVG([{DISYINCT|ALL}])

榪斿洖鏁板肩殑騫沖潎鍊箋傜己鐪佽緗負ALL.

 

SELECT AVG(sal),AVG(ALL sal),AVG(DISTINCT sal)
            FROM scott.empAVG(SAL) AVG(ALL SAL) AVG(DISTINCT SAL)
            1877.94118 1877.94118 1916.071413

COUNT({*|DISTINCT|ALL} )

榪斿洖鏌ヨ涓鐨勬暟鐩紝緙虹渷璁劇疆鏄疉LL,*琛ㄧず榪斿洖鎵鏈夌殑琛屻?

MAX([{DISTINCT|ALL}])

榪斿洖閫夋嫨鍒楄〃欏圭洰鐨勬渶澶у鹼紝濡傛灉x鏄瓧絎︿覆鏁版嵁綾誨瀷錛屼粬榪斿洖涓涓猇ARCHAR2鏁版嵁綾誨瀷錛屽鏋淴鏄竴涓狣ATA鏁版嵁綾誨瀷錛岃繑鍥炰竴涓棩鏈燂紝濡傛灉X鏄痭umeric鏁版嵁綾誨瀷錛岃繑鍥炰竴涓暟瀛椼傛敞鎰廳istinct鍜宎ll涓嶈搗浣滅敤錛屽簲涓烘渶澶у間笌榪欎袱縐嶈緗槸鐩稿悓鐨勩?

MIN([{DISTINCT|ALL}])

榪斿洖閫夋嫨鍒楄〃欏圭洰鐨勬渶灝忓箋?

STDDEV([{DISTINCT|ALL}])

榪斿洖閫夎呯殑鍒楄〃欏圭洰鐨勬爣鍑嗗樊錛屾墍璋撴爣鍑嗗樊鏄柟宸殑騫蟲柟鏍廣?

SUM([{DISTINCT|ALL}])

榪斿洖閫夋嫨鍒楄〃欏圭洰鐨勬暟鍊肩殑鎬誨拰銆?

VARIANCE([{DISTINCT|ALL}])

榪斿洖閫夋嫨鍒楄〃欏圭洰鐨勭粺璁℃柟宸?

鐢℅ROUP BY緇欐暟鎹垎緇?/strong>

姝e棰樼洰鏆楃ず鐨勯偅鏍風粍鍑芥暟灝辨槸鎿嶄綔閭d簺宸茬粡鍒嗗ソ緇勭殑鏁版嵁錛屾垜浠憡璇夋暟鎹簱鐢℅ROUP BY鎬庢牱緇欐暟鎹垎緇勬垨鑰呭垎綾伙紝褰撴垜浠湪SELECT璇彞鐨凷ELECT瀛愬彞涓嬌鐢ㄧ粍鍑芥暟鏃訛紝鎴戜滑蹇呴』鎶婁負鍒嗙粍鎴栭潪甯告暟鍒楁斁緗湪GROUP BY瀛愬彞涓紝濡傛灉娌℃湁鐢╣roup by榪涜涓撻棬澶勭悊錛岄偅涔堢己鐪佺殑鍒嗙被鏄皢鏁翠釜緇撴灉璁句負涓綾匯?

 

select stat,counter(*) zip_count from zip_codes GROUP BY state;
            ST ZIP_COUNT-- ---------AK 360AL 1212AR 1309AZ 768CA 3982

鍦ㄨ繖涓緥瀛愪腑錛屾垜浠敤state瀛楁鍒嗙被錛涘鏋滄垜浠灝嗙粨鏋滄寜鐓ip_codes鎺掑簭,鍙互鐢∣RDER BY璇彞錛孫RDER BY瀛愬彞鍙互浣跨敤鍒楁垨緇勫嚱鏁般?

 

select stat,counter(*) zip_count from zip_codes GROUP
            BY state ORDER BY COUNT(*) DESC;ST COUNT(*)-- --------
            NY 4312PA 4297TX 4123CA 3982

鐢℉AVING瀛愬彞闄愬埗鍒嗙粍鏁版嵁

鐜板湪浣犲凡緇忕煡閬撲簡鍦ㄦ煡璇㈢殑SELECT璇彞鍜孫RDER BY瀛愬彞涓嬌鐢ㄤ富鍑芥暟錛岀粍鍑芥暟鍙兘鐢ㄤ簬涓や釜瀛愪覆涓紝緇勫嚱鏁頒笉鑳界敤浜嶹HERE瀛愪覆涓紝渚嬪涓嬮潰鐨勬煡璇㈡槸閿欒鐨勶細

 

閿欒SELECT sales_clerk,SUN(sale_amount)
            FROM gross_sales WHERE sales_dept='OUTSIDE'
            AND SUM(sale_amount)>10000 GROUP BY sales_clerk

榪欎釜璇彞涓暟鎹簱涓嶇煡閬揝UM()鏄粈涔堬紝褰撴垜浠渶瑕佹寚紺烘暟鎹簱瀵硅鍒嗙粍錛岀劧鍚庨檺鍒跺垎緇勫悗鐨勮鐨勮緭鍑烘椂錛屾紜殑鏂規硶鏄嬌鐢℉AVING璇彞錛?

 

SELECT sales_clerk,SUN(sale_amount)
            FROM gross_sales WHERE sales_dept='OUTSIDE'
            GROUP BY sales_clerkHAVING SUM(sale_amount)>10000;


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