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瀛︿簩鐨勭尗 2006-04-30 10:24 鍙戣〃璇勮
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涓繪祦鏁版嵁搴撲腑涓存椂琛ㄧ殑浣跨敤http://www.tkk7.com/hsith/archive/2006/04/25/43000.html瀛︿簩鐨勭尗瀛︿簩鐨勭尗Tue, 25 Apr 2006 05:46:00 GMThttp://www.tkk7.com/hsith/archive/2006/04/25/43000.htmlhttp://www.tkk7.com/hsith/comments/43000.htmlhttp://www.tkk7.com/hsith/archive/2006/04/25/43000.html#Feedback0http://www.tkk7.com/hsith/comments/commentRss/43000.htmlhttp://www.tkk7.com/hsith/services/trackbacks/43000.html 涓繪祦鏁版嵁搴撲腑涓存椂琛ㄧ殑浣跨敤

MS SQLSERVER
SQL Server 鏀寔涓存椂琛ㄣ備復鏃惰〃灝辨槸閭d簺鍚嶇О浠ヤ簳鍙?(#) 寮澶寸殑琛ㄣ傚鏋滃綋鐢ㄦ埛鏂紑榪炴帴鏃舵病鏈夐櫎鍘諱復鏃惰〃錛孲QL Server 灝嗚嚜鍔ㄩ櫎鍘諱復鏃惰〃銆備復鏃惰〃涓嶅瓨鍌ㄥ湪褰撳墠鏁版嵁搴撳唴錛岃屾槸瀛樺偍鍦ㄧ郴緇熸暟鎹簱 tempdb 鍐呫?
涓存椂琛ㄦ湁涓ょ綾誨瀷錛?
鏈湴涓存椂琛?/b>錛氭湰鍦頒復鏃惰〃鐨勫悕縐頒互鍗曚釜鏁板瓧絎﹀彿 (#) 鎵撳ご錛涘畠浠粎瀵瑰綋鍓嶇殑鐢ㄦ埛榪炴帴鏄彲瑙佺殑錛涘綋鐢ㄦ埛浠?Microsoft SQL Server 2000 瀹炰緥鏂紑榪炴帴鏃惰鍒犻櫎銆?
鍏ㄥ眬涓存椂琛?/b>錛氬叏灞涓存椂琛ㄧ殑鍚嶇О浠ユ暟瀛︾鍙?(##) 鎵撳ご錛屽垱寤哄悗瀵逛換浣曠敤鎴烽兘鏄彲瑙佺殑銆傚鏋滃湪鍒涘緩鍏ㄥ眬涓存椂琛ㄧ殑榪炴帴鏂紑鍓嶆病鏈夋樉寮忓湴闄ゅ幓榪欎簺琛紝閭d箞鍙鎵鏈夊叾瀹冧換鍔″仠姝㈠紩鐢ㄥ畠浠紝榪欎簺琛ㄥ嵆琚櫎鍘匯傚綋鍒涘緩鍏ㄥ眬涓存椂琛ㄧ殑榪炴帴鏂紑鍚庯紝鏂扮殑浠誨姟涓嶈兘鍐嶅紩鐢ㄥ畠浠傚綋鍓嶇殑璇彞涓鎵ц瀹岋紝浠誨姟涓庤〃涔嬮棿鐨勫叧鑱斿嵆琚櫎鍘伙紱鍥犳閫氬父鎯呭喌涓嬶紝鍙鍒涘緩鍏ㄥ眬涓存椂琛ㄧ殑榪炴帴鏂紑錛屽叏灞涓存椂琛ㄥ嵆琚櫎鍘匯?
渚嬪錛屽鏋滃垱寤哄悕涓?employees 鐨勮〃錛屽垯浠諱綍浜哄彧瑕佸湪鏁版嵁搴撲腑鏈変嬌鐢ㄨ琛ㄧ殑瀹夊叏鏉冮檺灝卞彲浠ヤ嬌鐢ㄨ琛紝闄ら潪瀹冨凡鍒犻櫎銆傚鏋滃垱寤哄悕涓?#employees 鐨勬湰鍦頒復鏃惰〃錛屽彧鏈夋?zhèn)ㄨ兘瀵硅琛ㄦ墽琛屾搷浣滀笖鍦ㄦ柇寮榪炴帴鏃惰琛ㄥ垹闄ゃ傚鏋滃垱寤哄悕涓?##employees 鐨勫叏灞涓存椂琛紝鏁版嵁琛ㄤ腑鐨勪換浣曠敤鎴峰潎鍙璇ヨ〃鎵ц鎿嶄綔銆傚鏋滆琛ㄥ湪鎮(zhèn)ㄥ垱寤哄悗娌℃湁鍏朵粬鐢ㄦ埛浣跨敤錛屽垯褰撴?zhèn)ㄦ柇寮榪炴帴鏃惰琛ㄥ垹闄ゃ傚鏋滆琛ㄥ湪鎮(zhèn)ㄥ垱寤哄悗鏈夊叾浠栫敤鎴蜂嬌鐢紝鍒?SQL Server鍦ㄦ墍鏈夌敤鎴鋒柇寮榪炴帴鍚庡垹闄よ琛ㄣ?
鐜板湪錛屼復鏃惰〃鐨勮澶氫紶緇熺敤閫斿彲鐢卞叿鏈?table 鏁版嵁綾誨瀷鐨勫彉閲忔浛鎹€?

ORACLE
Oracle鏀寔涓存椂琛ㄣ備復鏃惰〃鐢ㄦ潵淇濆瓨浜嬪姟鎴栦細璇濇湡闂寸殑涓棿緇撴灉銆傚湪涓存椂琛ㄤ腑淇濆瓨鐨勬暟鎹彧鏈夊褰撳墠浼氳瘽鏄彲瑙佺殑錛屼換浣曚細璇濋兘涓嶈兘鐪嬪埌鍏朵粬浼氳瘽鐨勬暟鎹紝鍗充嬌鍦ㄥ綋鍓嶄細璇滳OMMIT鏁版嵁浠ュ悗涔熸槸涓嶅彲瑙佺殑銆傚鐢ㄦ埛騫惰涓嶆槸闂錛屼竴涓細璇濅粠鏉ヤ笉闃誨鍙︿竴涓細璇濅嬌鐢ㄤ復鏃惰〃銆傚嵆浣塊攣瀹氫復鏃惰〃錛屼竴涓細璇濅篃涓嶄細闃誨鍏朵粬浼氳瘽浣跨敤涓存椂琛ㄣ備復鏃惰〃姣旀甯歌〃浜х敓鐨凴EDO灝戝緱澶氾紝鐒惰岋紝鐢變簬涓存椂琛ㄥ繀欏諱駭鐢熷寘鍚暟鎹殑UNDO淇℃伅錛屾墍浠ヤ細浜х敓涓瀹氭暟閲忕殑REDO鏃ュ織銆?
涓存椂琛ㄥ皢浠庣敤鎴蜂復鏃惰〃絀洪棿鐨勭殑鐩墠鏃ュ織涓垎閰嶇┖闂達紝鎴栬呭鏋滀粠鏈夊畾涔夋潈鐨勭▼搴忎腑璁塊棶錛屽皢浣跨敤紼嬪簭鎵鏈夎呯殑涓存椂琛ㄧ┖闂淬傚叏灞涓存椂琛ㄥ疄闄呬笂鍙槸琛ㄦ湰韜殑妯℃澘銆傚垱寤轟復鏃惰〃鐨勮涓轟笉鍖呮嫭瀛樺偍絀洪棿鐨勫垎閰嶏紝涔熶笉鍖呮嫭INITIAL鐨勫垎閰嶃傚洜姝わ紝鍦ㄨ繍琛屾椂褰撲竴涓細璇濋鍏堝皢鏁版嵁鏀懼埌涓存椂琛ㄤ腑鏃訛紝榪欐椂灝嗗垱寤鴻繖涓細璇濈殑涓存椂孌點傜敱浜庢瘡涓細璇濊幏鍙栬嚜宸辯殑涓存椂孌碉紝姣忎釜鐢ㄦ埛鍙兘鍦ㄤ笉鍚岀殑琛ㄧ┖闂翠腑涓轟復鏃惰〃鍒嗛厤絀洪棿銆俇SER1鐨刣efault涓存椂琛ㄧ┖闂翠負TEMP1錛屼粬鐨勪復鏃惰〃灝嗕粠TEMP1涓垎閰嶇┖闂達紝USER2鐨刣efault涓存椂琛ㄧ┖闂翠負TEMP2錛屼粬鐨勪復鏃惰〃灝嗕粠TEMP2涓垎閰嶇┖闂淬?
涓存椂琛ㄥ湪姣忎釜鏁版嵁搴撲腑鍙渶鍒涘緩涓嬈★紝涓嶅繀鍦ㄦ瘡涓瓨鍌ㄨ繃紼嬩腑鍒涘緩銆備復鏃惰〃鎬繪槸瀛樺湪鐨勶紝闄ら潪鎵嬪姩鐨勫垹闄や粬銆備復鏃惰〃浣滀負瀵硅薄瀛樺湪鏁版嵁瀛楀吀涓紝騫朵笖鎬繪槸淇濇寔涓虹┖錛岀洿鍒版湁浼氳瘽鍦ㄥ叾涓斁鍏ユ暟鎹侽racle鍏佽鍒涘緩鍩轟簬涓存椂琛ㄧ殑瑙嗗浘鍜屽瓨鍌ㄨ繃紼嬨?
涓存椂琛ㄥ彲浠ユ槸浠ヤ細璇濅負鍩虹鐨勶紝涔熷彲浠ユ槸浠ヤ簨鍔′負鍩虹鐨勩侽N COMMIT PRESERVE ROWS瀛愬彞浣夸復鏃惰〃鎴愪負鍩轟簬浼氳瘽鐨勬ā寮忋傝灝嗙暀鍦ㄦ琛ㄤ腑錛岀洿鍒頒細璇濇柇寮鎴栭氳繃DELETE鎴朤RUNCATE浠庣墿鐞嗕笂鍒犻櫎榪欎簺琛屻侽N COMMIT DELETE ROWS瀛愬彞浣夸復鏃惰〃鎴愪負鍩轟簬浜嬪姟鐨勬ā寮忋傚綋浼氳瘽鎻愪氦鍚庯紝琛屾秷澶便傝繖涓復鏃惰〃鐨勮嚜鍔ㄦ竻闄よ繃紼嬩笉浼氭湁棰濆鐨勫紑閿銆?
鍦╫racle涓紝搴旂敤紼嬪簭闇瑕佺殑涓存椂琛ㄥ簲璇ュ湪紼嬪簭瀹夎鏃跺垱寤猴紝鑰屼笉鏄湪紼嬪簭榪愯鏃跺垱寤恒傦紙榪欐槸涓巑s sqlserver鎴杝ybase鐨勪嬌鐢ㄧ殑涓嶅悓錛?
鍦ㄤ換浣曟暟鎹簱涓紝涓存椂琛ㄧ殑涓涓己鐐規(guī)槸錛氫簨瀹炰笂浼樺寲鍣ㄥ湪涓存椂琛ㄤ腑娌℃湁鐪熸鐨勭粺璁″姛鑳姐傜劧鑰岋紝鍦╫racle涓紝涓緋誨垪杈冨ソ鐨勭粺璁$寽嫻嬪彲浠ラ氳繃DBMS_STATS鍖呭湪涓存椂琛ㄤ腑璁劇疆銆?

DB2
鍙嬌鐢?DECLARE GLOBAL TEMPORARY TABLE 璇彞鏉ュ畾涔変復鏃惰〃銆侱B2鐨勪復鏃惰〃鏄熀浜庝細璇濈殑錛屼笖鍦ㄤ細璇濅箣闂存槸闅旂鐨勩傚綋浼氳瘽緇撴潫鏃訛紝涓存椂琛ㄧ殑鏁版嵁琚垹闄わ紝涓存椂琛ㄨ闅愬紡鍗鎬笅銆傚涓存椂琛ㄧ殑瀹氫箟涓嶄細鍦⊿YSCAT.TABLES涓嚭鐜?
涓嬮潰鏄畾涔変復鏃惰〃鐨勪竴涓ず渚嬶細
聽聽 DECLARE GLOBAL TEMPORARY TABLE gbl_temp

聽聽聽聽聽 LIKE empltabl

聽聽聽聽聽 ON COMMIT DELETE ROWS

聽聽聽聽聽 NOT LOGGED

聽聽聽聽聽 IN usr_tbsp

姝よ鍙ュ垱寤轟竴涓悕涓?gbl_temp 鐨勭敤鎴蜂復鏃惰〃銆傚畾涔夋鐢ㄦ埛涓存椂琛?鎵浣跨敤鐨勫垪鐨勫悕縐板拰璇存槑涓?empltabl 鐨勫垪鐨勫悕縐板拰璇存槑瀹屽叏鐩稿悓銆傞殣寮忓畾涔?鍙寘鎷垪鍚嶃佹暟鎹被鍨嬨佸彲涓虹┖鐗規(guī)у拰鍒楃己鐪佸煎睘鎬с傛湭瀹氫箟鎵鏈夊叾浠栧垪灞炴э紝鍖呮嫭鍞竴綰︽潫銆佸閮ㄥ叧閿瓧綰︽潫銆佽Е鍙戝櫒鍜岀儲寮曘傛墽琛?COMMIT 鎿嶄綔鏃訛紝 鑻ユ湭瀵硅琛ㄦ墦寮 WITH HOLD 娓告爣錛屽垯璇ヨ〃涓殑鎵鏈夋暟鎹兘琚垹闄ゃ備笉璁板綍 瀵圭敤鎴蜂復鏃惰〃鎵浣滅殑鏇存敼銆傜敤鎴蜂復鏃惰〃琚斁鍦ㄦ寚瀹氱殑鐢ㄦ埛涓存椂琛ㄧ┖闂翠腑銆傛琛ㄧ┖闂村繀欏誨瓨鍦紝鍚﹀垯姝よ〃鐨勫0鏄庡皢澶辮觸銆?
鎴峰畾涔変復鏃惰〃涓嶆敮鎸侊細
  • LOB 綾誨瀷鐨勫垪錛堟垨鍩轟簬 LOB 鐨勫崟鍊肩被鍨嬪垪錛?
  • 鐢ㄦ埛瀹氫箟綾誨瀷鍒?
  • LONG VARCHAR 鍒?
DATALINK 鍒?/font>

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NC-->SQL寮鍙戞墜鍐?2)http://www.tkk7.com/hsith/archive/2006/04/23/42566.html瀛︿簩鐨勭尗瀛︿簩鐨勭尗Sat, 22 Apr 2006 16:41:00 GMThttp://www.tkk7.com/hsith/archive/2006/04/23/42566.htmlhttp://www.tkk7.com/hsith/comments/42566.htmlhttp://www.tkk7.com/hsith/archive/2006/04/23/42566.html#Feedback1http://www.tkk7.com/hsith/comments/commentRss/42566.htmlhttp://www.tkk7.com/hsith/services/trackbacks/42566.html
涓夈佸鏁版嵁搴撶殑鑰冭檻

1.聽聽聽聽聽聽聽 瀛楃涓茶繛鎺ュ繀欏葷敤鈥?/span>||鈥濈鍙鳳紝涓嶄嬌鐢ㄢ?/span>+鈥濄傛敞鎰忥細鍦?/span>Oracle涓竴涓?/span>null鍊間笌闈?/span>null鍊艱繛鎺ワ紝緇撴灉涓洪潪null鍊鹼紝鍦?/span>DB2鍜?/span>SqlServer涓浉鍙嶃備嬌鐢?/span>nvl瀵?/span>null杞崲涓?/span>鈥欌欍?br />
2.聽聽聽聽聽聽聽 閫氶厤絎︿笉鑳戒嬌鐢ㄢ?/span>[a-c]%鈥?/font>榪欑褰㈠紡錛屽簲鍐欐垚濡傦細select * from table_name where col1 like 鈥榌a]%鈥?OR col1 like 鈥榌b]%鈥?OR col1 like 鈥榌c]%鈥?銆?br />
3.聽聽聽聽聽聽聽 鍦ㄥchar綾誨瀷姣旇緝鏃?/span>,瑕佸鍒楀姞涓?/span>rtrim()鍑芥暟,鍚﹀垯鍦?/span>Oracle涓笉浼氬緱鍒版紜粨鏋溿備緥濡傝嫢test琛ㄤ腑鐨勫瓧孌?/span>f1鐨勯暱搴︿負10錛屽唴鏈変竴涓間負鈥?/span>aa鈥?/font>錛岀殑綰綍錛屽垯璇彞select len(f1) from test;鍦?/span>SqlServer鐨勬墽琛岀粨鏋滀負2錛屽湪Oracle鐨勬墽琛岀粨鏋滀負10銆?br />
4.聽聽聽聽聽聽聽聽 鍦?/span>Case when璇彞涓彧鑳藉嚭鐜?/span> =銆?/span>>=銆?/span><= 浠ュ強is null榪愮畻絎︼紝涓嶈兘鍑虹幇 <銆?/span>>銆?/span><>銆?/span>!=銆佷互鍙?/span>is not null榪愮畻絎︺?/span>鍚﹀垯鍦?/span>Oracle鐨?/span>decode鍑芥暟鏃犳硶琛ㄨ揪銆?br />聽聽聽褰撳繀欏諱嬌鐢?/font> <, >, != 錛?/span>is not null鏃訛紝寤鴻閲囩敤濡備笅鍙橀氭柟娉曪細
聽聽聽聽聽聽聽聽聽 1錛変嬌鐢?/span> !=鏃訛細渚嬪
聽聽 casewhenA!=Bthene,
聽聽聽聽聽聽聽 鍙敼涓?/span>錛?/span>caseA=bthene1elsee聽聽 (闂存帴瀹炵幇
A!=B)
聽聽聽聽聽聽聽聽聽 2錛変嬌鐢?/span> < 鏃訛細渚嬪
聽聽 casewhenA<Bthene,
聽聽聽聽聽聽聽 鍙敼涓?/span>錛?/span>caseA<=bthencase A=Bthene1elsee(闂存帴瀹炵幇
A<B)
聽聽聽聽聽聽聽 鎴?/span>聽聽聽 caseA>=bthene1elsee聽聽聽 (闂存帴瀹炵幇
A<B)
聽聽聽聽聽聽聽聽聽 3錛変嬌鐢?/span> > 鏃訛細渚嬪
聽聽 casewhenA>Bthene,聽
聽聽聽聽聽聽聽 鍙敼涓?/span>錛?/span>caseA>=bthencase A=Bthen e1elsee聽聽 (闂存帴瀹炵幇
A>B)
聽聽聽聽聽聽聽聽鎴?/span>聽聽聽 caseA<=bthene1elsee聽聽聽 (闂存帴瀹炵幇
A>B)
聽聽聽聽聽聽聽聽聽聽4錛変嬌鐢?/span>isnotnull鏃訛細渚嬪
casewhenAisnotnullthene,
聽聽聽聽聽聽聽 鍙敼涓猴細caseA聽聽 isnullthene1聽聽 else聽聽 e(闂存帴瀹炵幇
Aisnotnull)
鐗瑰埆璇存槑錛氬綋鎵ц澶ф暟鎹噺鐨勬搷浣滄椂錛?/span>sqlServer瀵?/span> case when 鐨勬墽琛屾晥鐜囨瀬浣庯紝鐢氳嚦鍙兘浼氭鏈猴紝鍥犳甯屾湜澶у灝介噺涓嶈浣跨敤case when
銆?br />
5.聽聽聽聽聽聽聽 鍙備笌宸﹁繛鎺ョ殑鍒椾笉鑳戒負甯擱噺銆備緥濡傦紝涓嶅厑璁稿涓嬭鍙ワ細 select * from t1 left outer join t2 on t1.f1='A'
銆?br />
6.聽聽聽聽聽聽聽 宸﹁繛鎺ョ殑鍐欐硶蹇呴』甯︹?/span>outer鈥濆叧閿瓧銆備緥濡傦細 select f1 from t1 left outer t2 on t1.f1 = t2.f1錛涜屼笉鏄細 select f1 from t1 left t2 on t1.f1 = t2.f1
銆?br />
7.聽聽聽聽聽聽聽 鍙兘浣跨敤浠ヤ笅鍑芥暟錛屽瑕佷嬌鐢ㄦ柊鐨勫嚱鏁板繀欏葷敵鎶ワ紝瀹℃壒鍚庢墠鑳戒嬌鐢ㄣ傚嚱鏁幫細coalesce, cast, len, left, replace, right, substring, lower, upper, ltrim, rtrim, abs, acos, asin, atan, cos, ceiling, exp, floor, log, power, round, sign,sin, square, sqrt, tan, count, max, min, sum, avg
銆?br />
8.聽聽聽聽聽聽聽 substring鍑芥暟涓搗濮嬩綅緗負1
錛岃〃紺轟粠澶村紑濮嬨?br />
9.聽聽聽聽聽聽聽 Like
鐨勪竴杈瑰繀欏繪槸瀛楃涓詫紝鍙兘鍦ㄤ竴杈瑰嚭鐜拌〃鍒椼?br />
10.聽聽聽 鍦?/span>SQL璇彞涓笉鑳界洿鎺ヤ嬌鐢?/span>null,蹇呴』瀵?/span>null鎸囨槑綾誨瀷,鍦ㄥ垽鏂煇鍊間負null
鏃墮櫎澶栥?br />
11.聽聽聽 瀵逛簬涓浜?/span>char/varchar鐨勫瓧孌電殑鍊鹼紝鍗充嬌鏄?/span>0,1錛?/span>2鈥?/font>絳夊鹼紝涔熷繀欏昏〃杈句負鈥?chmetcnv tcsc="0" numbertype="1" negative="False" hasspace="False" sourcevalue="0" unitname="鈥? w:st="on">0鈥?鈥?chmetcnv tcsc="0" numbertype="1" negative="False" hasspace="False" sourcevalue="1" unitname="鈥? w:st="on">1鈥?鈥?chmetcnv tcsc="0" numbertype="1" negative="False" hasspace="False" sourcevalue="2" unitname="鈥? w:st="on">2鈥欌β?br />
12.聽聽聽 鍦?/span>cast鍜?/span>convert璇彞涓彧鏀寔鍒板瓧絎﹀瀷銆佹棩鏈熷瀷鍜屾暟瀛楀瀷鐨勮漿鎹紝涓旀棩鏈熷瀷鍙敮鎸?/span>UFDate鐨勬牸寮忥紝鍗?/span>
鈥橸YYY鈥?鈥楳M鈥?鈥楧D鈥櫬?br />
13.聽聽聽 insert 璇彞涓嶉氳繃SQL緲昏瘧鍣紝鍦?/span>insert涓笉鍏佽浣跨敤select
銆?br />
14.聽聽聽 涓嶈兘閫氳繃鏉?/span>percentn 闄愬埗鏌ヨ緇撴灉闆嗙殑璁板綍鏁幫紝涔熶笉鑳戒嬌鐢?/span> selecttop n
鐨勮鍙?br />
15.聽聽聽聽 outer join 鍓嶅悗鐨勮〃涓嶈兘浜掔浉榪炴帴,
涓嶈兘閲嶅榪炴帴錛屽嵆涓嶈兘鍑虹幇浠ヤ笅褰㈠紡鐨勮鍙ワ細
聽聽聽聽聽聽聽聽聽聽 aleft outer join c on a.fda=c.fdsfleft outer join b on b.fdsa=c.fsdff(璇ヨ鍙ヤ腑琛?/span>a銆?/span>b鍚屾椂榪炴帴鍒頒簡琛?/span>c涓?/span>
)
聽聽聽聽聽聽聽聽聽聽聽聽 aleft outer join b on a.fda=b.fdsfleft outer join a on b.fdsa=a.fsdff(璇ヨ鍙ヤ腑琛?/span>a銆?/span>b浜掕仈
)

16.聽聽聽 join 涓?/span>on 蹇呴』涓ユ牸鍖歸厤錛屼笉鍏佽鍑虹幇娌℃湁on鐨?/span>join
銆?br />
17.聽聽聽
join鈥n
鍚庨潰鎱庣敤 or,濡傛灉鐢ㄥ埌錛岃鎶?/span>or鐨勮寖鍥寸敤( )鎷搗鏉?br />
18.聽聽聽
濡傛灉鏌愪釜琛ㄦ湁鍒悕錛屽垯蹇呴』寮曠敤瀹冪殑鍒悕錛屼笉璁稿紩鐢ㄥ畠鍘熸潵鐨勮〃鍚?br />
19.聽聽聽聽
鍦ㄥ瓙鏌ヨ涓墠鍚庡繀欏誨姞涓婃嫭鍙?br />
20.聽聽 order by 鍚庣殑鍒楀悕鍦?/span>select
鍚庢湁澶氫釜鐩稿悓鐨勫垪錛屼緥濡備笉鑳藉啓涓猴細
聽聽聽聽聽select a, b, a, afrom fdsforder by a(a 鍦?span lang="EN-US">select鍚庡嚭鐜頒簡澶氭)
鍙互緇?span lang="EN-US">a 鍔犲埆鍚?br />
21.聽聽聽 涓嶈兘浣跨敤select into 鐨勬牸寮?br />
22.聽聽聽 緇欐煇涓瓧絎﹀瀷鐨勫垪璧嬪兼椂錛屽鏋滃叾鍊煎惈鏈夊崟寮曞彿錛屼緥濡傦細setcol=鈥檉sdf鈥檉dsfdsf鈥檚df鈥欌?
鏈変袱縐嶈В鍐蟲柟妗?
聽聽聽聽聽聽1
錛夊皢鍗曞紩鍙峰啓鎴?span lang="EN-US">鈥欌?鍗?/font>setcol=鈥檉sdf鈥欌檉dsfdsf鈥欌檚df鈥?br />
聽聽聽聽聽聽聽 2錛夐氳繃set鐨勬柟寮忚祴鍊鹼紝鍗籌細setcol= 錛?鈥?br />聽聽聽聽聽聽聽聽聽聽 鐒跺悗錛?/font>setString(8,鈥?鈥檉sdf鈥檉dsfdsf鈥檚df鈥欌?


]]>
NC-->SQL寮鍙戞墜鍐?1)http://www.tkk7.com/hsith/archive/2006/04/23/42562.html瀛︿簩鐨勭尗瀛︿簩鐨勭尗Sat, 22 Apr 2006 16:22:00 GMThttp://www.tkk7.com/hsith/archive/2006/04/23/42562.htmlhttp://www.tkk7.com/hsith/comments/42562.htmlhttp://www.tkk7.com/hsith/archive/2006/04/23/42562.html#Feedback3http://www.tkk7.com/hsith/comments/commentRss/42562.htmlhttp://www.tkk7.com/hsith/services/trackbacks/42562.html 鏈墜鍐屾槸鐢ㄥ弸NC寮鍙戣繃紼嬩腑SQL浣跨敤鐨勭粡楠屾葷粨鍜屽己鍒惰鑼冿紝甯屾湜瀵瑰ぇ瀹剁殑SQL璇彞鐨勪功鍐欏拰鏁版嵁搴撶殑寮鍙戣兘澶熺粰涓庝竴瀹氱殑鍊熼壌銆?br />
涓銆佹榪?br />
鏈墜鍐屼晶閲嶄簬
SQL 寮鍙戜功鍐欒繃紼嬩腑鐨勮鑼冮棶棰樸傚敖鍙兘鐨勫湪鎬葷粨浠ュ線寮鍙戣繃紼嬩腑褰㈡垚鐨?/span> SQL 寮鍙戞柟娉曪紝騫墮拡瀵瑰湪杞歡緇存姢銆?/span> SQL 璇彞璺ㄥ鏁版嵁搴撱佹搷浣滅郴緇熼傞厤涓嚭鐜伴棶棰樼殑瑙e喅鍔炴硶鐨勫熀紜涓婏紝鎻愬嚭鐨勪竴涓?/span> SQL 寮鍙戣鑼冦?br />
浜屻佷功鍐欓鏍?br />
1. SQL 璇彞鍏ㄩ儴浣跨敤灝忓啓錛岄櫎鍦?/span> SQL 涓敤寮曞彿鎷搗鏉ョ殑甯擱噺澶栵紝璇蜂嬌鐢ㄥ崟瀛楄妭銆?br />
2. 寮曠敤瀛楃鏃剁敤鍗曞紩鍙楓傚錛?/span> update testable set idcol=鈥檃bcd鈥?/font> 銆?/span>

3.
灝介噺浣跨敤 prepareStatement 錛屽埄鐢ㄩ澶勭悊鍔熻兘銆傚皯鐢?/span> createStatement 銆?br />
4.聽鍦?/font> 鎷艱 SQL 鐨勬椂鍊欙紝浣跨敤 StringBuffer, 涓嶈鐢?/span> String+String 鐨勬柟寮忋?br />
5. 涓ョ浣跨敤 select * 鈥︹? 褰㈠紡鐨勮鍙ワ紝瑕佹寚鍑?/span> select
鐨勫叿浣撳瓧孌點?br />
6. 涓ョ浣跨敤 insert into table value(?????) 錛岃鎸囧嚭鍏蜂綋瑕佽祴鍊肩殑瀛楁銆?/span>

7.
SQL
璇彞鍖呭惈澶氳〃榪炴帴鏃訛紝蹇呴』瀵規(guī)瘡涓〃鍛藉悕鍒悕錛屽姣忎釜瀛楁鐨勪嬌鐢ㄩ兘瑕佸甫涓婂埆鍚嶃?br />
8. 褰?/span> SQL 璇彞鍚湁榪愮畻絎︽椂錛岃繍綆楃闇涓庡叾浠栧瓧絎︿覆鐢ㄧ┖鏍煎尯鍒?/span> ( 鎴栬呯敤鎷彿鍒嗗紑 ) 銆傚惁鍒欏鏄撳鑷翠互涓嬬被浼奸棶棰樸傚湪璇彞 select a鈥揵 from table 涓紝 a 錛?/span> b 鍧囦負鍙橀噺銆傛嫾鍐欒璇彞鏃訛紝濡傛灉 a=6 錛?/span> b= -3 錛屽垯璇彞鍙樹負 select 6--3 from table 銆?/span> -- 鍙樹負 Sql
鐨勬敞閲婏紝璇彞鎶ラ敊銆?br />
9. 閬垮厤闅愬惈鐨勭被鍨嬭漿鎹€備緥濡傚湪 where 瀛愬彞涓?/span> numeric 鍨嬪拰 int 鍨嬬殑鍒楃殑姣旇緝鎴栫浉鍔犮?br />
10. 璇誨彇鏄寚閫氳繃 JDBC 璇誨埌鐨勬暟鎹牸寮忥紝淇濆瓨鏄寚淇濆瓨鍦?/span> VO 涓殑鏁版嵁鏍煎紡錛屾彃鍏ユ垨鑰呮洿鏂版槸鎸?/span> insert 鎴栬?/span> update 璇彞涓殑鏁版嵁鏍煎紡銆?br /> 聽聽聽 a)聽聽 鏁村瀷瀛楁錛氳鍙栨椂鏍規(guī)嵁瀛楁璁劇疆淇濆瓨涓?/span> Integer 鎴栬?/span> Long 銆?br /> 聽聽聽 b)聽聽 鏁板瓧鍨嬪瓧孌碉細璇誨彇涓?/span> BigDecimal 錛屽茍淇濆瓨涓?/span> UFDouble 錛屾彃鍏ユ垨鑰呮洿鏂版椂涓?/span> BigDecimal 銆?br /> 聽聽聽 c)聽聽 瀛楃鍨嬪瓧孌碉細璇誨彇涓?/span> String 錛屽茍淇濆瓨涓?/span> String 錛屾彃鍏ユ垨鑰呮洿鏂頒負 String 銆?br /> 聽聽聽 d)聽聽 甯冨皵鍨嬪瓧孌碉細璇誨彇涓?/span> String(鈥榊鈥?OR 鈥楴鈥? 錛屽茍淇濆瓨涓?/span> UFBoolean 錛屾彃鍏ユ垨鑰呮洿鏂版椂涓?/span> String(鈥榊鈥?OR 鈥楴鈥? 銆?br /> 聽聽聽 e)聽聽 鏃墮棿瀛楁錛氳鍙栦負 String 錛屽茍淇濆瓨涓?/span> UFDateTime 錛屾彃鍏ユ垨鑰呮洿鏂版椂鐨勬椂闂存牸寮忕敱涓棿浠剁粺涓澶勭悊錛屾湁鍗曠嫭闇姹傜殑瑕佺敵璇峰悗鎵嶈兘鍐沖畾銆?br /> 聽聽
11.
灝介噺涓嶄嬌鐢ㄥ彸榪炴帴銆?br />
12. 鍦ㄤ嬌鐢?/span> UNION 鎴?/span> UNIONALL 鐨勫墠鍚庣殑涓や釜 SQL 闇瑕佸姞 ( )
銆?/font>



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