Oracle鏁版嵁搴撲紭鍖栫殑鍑犵偣鎬荤粨(杞

涓汉鐞嗚В锛屾暟鎹簱鎬ц兘鏈€鍏抽敭鐨勫洜绱犲湪浜嶪O锛屽洜涓烘搷浣滃唴瀛樻槸蹇€熺殑锛屼絾鏄鍐欑鐩樻槸閫熷害寰堟參鐨勶紝浼樺寲鏁版嵁搴撴渶鍏抽敭鐨勯棶棰樺湪浜庡噺灏戠鐩樼殑IO锛屽氨涓?浜虹悊瑙ｅ簲璇ュ垎涓虹墿鐞嗙殑鍜岄€昏緫鐨勪紭鍖栵紝 鐗╃悊鐨勬槸鎸噊racle浜у搧鏈韩鐨勪竴浜涗紭鍖栵紝閫昏緫浼樺寲鏄寚搴旂敤绋嬪簭绾у埆鐨勪紭鍖栫墿鐞嗕紭鍖栫殑涓€浜涘師鍒欙細銆€銆€1锛塐racle鐨勮繍琛岀幆澧冿紙缃戠粶锛岀‖浠剁瓑锛壜?/span>
銆€銆€2锛変娇鐢ㄥ悎閫傜殑浼樺寲鍣?/span>
銆€銆€3锛夊悎鐞嗛厤缃畂racle瀹炰緥鍙傛暟聽
銆€銆€4锛夊缓绔嬪悎閫傜殑绱㈠紩锛堝噺灏慖O锛壜?/span>
銆€銆€5锛夊皢绱㈠紩鏁版嵁鍜岃〃鏁版嵁鍒嗗紑鍦ㄤ笉鍚岀殑琛ㄧ┖闂翠笂锛堥檷浣嶪O鍐茬獊锛壜?/span>
銆€銆€6锛夊缓绔嬭〃鍒嗗尯锛屽皢鏁版嵁鍒嗗埆瀛樺偍鍦ㄤ笉鍚岀殑鍒嗗尯涓婏紙浠ョ┖闂存崲鍙栨椂闂达紝鍑忓皯IO锛壜?/span>
銆€銆€閫昏緫涓婁紭鍖栵細聽
銆€銆€1锛夊彲浠ュ琛ㄨ繘琛岄€昏緫鍒嗗壊锛屽涓浗绉诲姩鐢ㄦ埛琛紝鍙互鏍规嵁鎵嬫満灏炬暟鍒嗘垚10涓〃锛岃繖鏍峰鎬ц兘浼氭湁涓€瀹氱殑浣滅敤聽
銆€銆€2锛塖ql璇彞浣跨敤鍗犱綅绗﹁鍙ワ紝骞朵笖寮€鍙戞椂鍊欏繀椤绘寜鐓ц瀹氱紪鍐檚ql璇彞锛堝鍏ㄩ儴澶у啓锛屽叏閮ㄥ皬鍐欑瓑锛塷racle瑙ｆ瀽璇彞鍚庝細鏀剧疆鍒板叡浜睜涓紝 濡傦細聽
銆€銆€select * from Emp where name=锛熻繖涓鍙ュ彧浼氬湪鍏变韩姹犱腑鏈変竴鏉★紝鑰屽鏋滄槸瀛楃涓茬殑璇濓紝閭ｅ氨鏍规嵁涓嶅悓鍚嶅瓧瀛樺湪涓嶅悓鐨勮鍙ワ紝鎵€浠ュ崰浣嶇鏁堢巼杈冨ソ聽
銆€銆€3锛夋暟鎹簱涓嶄粎浠呮槸涓€涓瓨鍌ㄦ暟鎹殑鍦版柟锛屽悓鏍锋槸涓€涓紪绋嬬殑鍦版柟锛屼竴浜涜€楁椂鐨勬搷浣滐紝鍙互閫氳繃瀛樺偍杩囩▼绛夊湪鐢ㄦ埛杈冨皯鐨勬儏鍐典笅鎵ц锛屼粠鑰岄敊寮€绯荤粺浣跨敤鐨勯珮宄版椂闂达紝鎻愰珮鏁版嵁搴撴€ц兘聽
銆€銆€4锛夊敖閲忎笉浣跨敤*鍙凤紝濡俿elect * from Emp锛屽洜涓鸿杞寲涓哄叿浣撶殑鍒楀悕鏄鏌ユ暟鎹瓧鍏革紝 姣旇緝鑰楁椂聽
銆€銆€5锛夐€夋嫨鏈夋晥鐨勮〃鍚嵚?/span>
銆€銆€瀵逛簬澶氳〃杩炴帴鏌ヨ锛屽彲鑳給racle鐨勪紭鍖栧櫒骞朵笉浼氫紭鍖栧埌杩欎釜绋嬪害锛?oracle 涓琛ㄦ煡璇㈡槸鏍规嵁FROM瀛楀彞浠庡彸鍒板乏鐨勬暟鎹繘琛岀殑锛岄偅涔堟渶濂藉彸杈圭殑琛紙涔熷氨鏄熀纭€琛級閫?鎷╂暟鎹緝灏戠殑琛紝杩欐牱鎺掑簭鏇村揩閫燂紝濡傛灉鏈塴ink琛紙澶氬澶氫腑闂磋〃锛夛紝閭ｄ箞灏唋ink琛ㄦ斁鏈€鍙宠竟浣滀负鍩虹琛紝鍦ㄩ粯璁ゆ儏鍐典笅oracle浼氳嚜鍔ㄤ紭鍖栵紝浣嗘槸濡?鏋滈厤缃簡浼樺寲鍣ㄧ殑鎯呭喌涓嬶紝鍙兘涓嶄細鑷姩浼樺寲锛屾墍浠ュ钩鏃舵渶濂借兘鎸夌収杩欎釜鏂瑰紡缂栧啓sql聽
銆€銆€6锛塛here瀛楀彞瑙勫垯锛毬?/span>
銆€銆€Oracle 涓璚here瀛楀彞鏃朵粠鍙冲線宸﹀鐞嗙殑锛岃〃涔嬮棿鐨勮繛鎺ュ啓鍦ㄥ叾浠栨潯浠朵箣鍓嶏紝鑳借繃婊ゆ帀闈炲父澶氱殑鏁版嵁鐨勬潯浠讹紝鏀惧湪where鐨勬湯灏撅紝 鍙﹀锛?绗﹀彿姣旇緝鐨勫垪灏嗕笉浣跨敤绱㈠紩锛屽垪缁忚繃浜嗚绠楋紙濡傚彉澶у啓绛夛級涓嶄細浣跨敤绱㈠紩锛堥渶瑕佸缓绔嬭捣鍑芥暟锛夛紝 is null銆乮s not null绛変紭鍖栧櫒涓嶄細浣跨敤绱㈠紩聽
銆€銆€7锛変娇鐢‥xits Not Exits 鏇夸唬 In Not in聽
銆€銆€8锛夊悎鐞嗕娇鐢ㄤ簨鍔★紝鍚堢悊璁剧疆浜嬪姟闅旂鎬э紝鏁版嵁搴撶殑鏁版嵁鎿嶄綔姣旇緝娑堣€楁暟鎹簱璧勬簮鐨勶紝灏介噺浣跨敤鎵归噺澶勭悊锛屼互闄嶄綆浜嬪姟鎿嶄綔娆℃暟