锘??xml version="1.0" encoding="utf-8" standalone="yes"?>男同在线观看,污污网站在线观看,午夜免费久久久久http://www.aygfsteel.com/llgllg2007/archive/2009/09/25/296369.html杈鵑Plus杈鵑PlusFri, 25 Sep 2009 01:02:00 GMThttp://www.aygfsteel.com/llgllg2007/archive/2009/09/25/296369.htmlhttp://www.aygfsteel.com/llgllg2007/comments/296369.htmlhttp://www.aygfsteel.com/llgllg2007/archive/2009/09/25/296369.html#Feedback0http://www.aygfsteel.com/llgllg2007/comments/commentRss/296369.htmlhttp://www.aygfsteel.com/llgllg2007/services/trackbacks/296369.html鏁版嵁搴撳熀鏈煡璇?sql)
涓嬩釜鏄熸湡瑕佽€冩暟鎹簱錛岀幇鎶婂熀鏈煡璇嗙◢鍋氭暣鐞嗭細(xì)
sql鐨勬蹇碉細(xì)
SQL (Structured Query Language緇撴瀯鍖栨煡璇㈣璦€)鏄洰鍓嶄嬌鐢ㄦ渶騫跨殑騫朵笖鏄爣鍑嗙殑鏁版嵁搴撹璦€銆?br />
sql璇█鐨勬瀯鎴愶細(xì)
SQL璇█鍖呮嫭綰?0鏉¤鍙?姣忔潯璇彞璇鋒眰DBMS瀹屾垚涓€涓姩浣?
姣忔潯SQL璇彞閮戒互涓€涓姩璇嶅紑澶?榪欐槸鎻忚堪璇ヨ鍙ュ姛鑳界殑鍏抽敭瀛?鎺ョ潃鏄竴涓垨鍑犱釜瀛愬彞.
瀛愬彞鎸囧畾璇ヨ鍙ユ墍浣滅敤鐨勬暟鎹?鎴栬璇彞琛屼負(fù)鐨勬洿璇︾粏璇存槑.
姣忎釜瀛愬彞閮戒互涓€涓叧閿瓧寮€澶?鏈夊寘鍚〃鍚嶅拰鍒楀悕,鏈夊惈鏈夐檮鍔犲叧閿瓧,甯告暟鎴栬〃杈懼紡.
sql鐨勫懡鍚嶏細(xì)
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SQL璇彞涓敤鍚嶅瓧鏍囪瘑璇ヨ鍙ヤ綔鐢ㄧ殑鏁版嵁搴撳璞?/span>.
ANSI/ISO SQL鏍囧噯瑙勫畾鐨勫悕瀛楁湁琛ㄥ悕(鏍囪瘑琛?/span>),鍒楀悕(鏍囪瘑鍒?/span>)鍜岀敤鎴峰悕(鏍囪瘑鏁版嵁搴撶殑鐢ㄦ埛)
璁稿SQL瀹炵幇鏀寔闄勫姞鍛藉悕瀵硅薄
sql鐨勬暟鎹被鍨嬶細(xì)
瀹氶暱瀛楃涓?/span>.(CHAR(LEN),CHARACTER(LEN)
鏁存暟.(NUMBER(P,S) ,SMALLINT,INTEGER)
灝忔暟.(NUMBER(P,S) ,DECIMAL(P,S))
嫻偣鏁?/span>.(NUMBER(P,S),FLOAT(P),REAL)
鍙彉闀垮瓧絎︿覆.(VARCHAR2(N),VARCHAR(N))
閲戦.(NUMBER(P,S),MEONEY))
鏃ユ湡鍜屾椂闂?/span>.(DATE,DATETIME,TIMESTAMP)
闀挎枃瀛?/span>.(LONG,LONG VARCHAR)
鏃犵粨鏋勫瓧鑺傛祦.(RAW,LONG RAW)
sql鐨?span>琛ㄨ揪寮?br />
鍦?/span>SQL璇█涓?/span>,琛ㄨ揪寮忕敤浜庤綆椾粠鏁版嵁搴撲腑媯€(gè)绱㈢殑鍊間互鍙?qiáng)鐢ㄤ?/span>鎼滅儲(chǔ)鏁版嵁搴撶殑鍊?/span>.
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鏈夌殑浜у搧榪樻敮鎸佹棩鏈熻繍綆楄〃杈捐瘯.
ORACLE涓殑瀛楃榪炴帴榪愮畻浣跨敤‘||’ 榪愮畻絎?br />
sql鐨?span>鍐呴儴鏋勯€犲嚱鏁?
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±鏁板€煎鐞嗗嚱鏁?/span>.(ABS,ROUND,TRUNC,SQRT)
±瀛楃澶勭悊鍑芥暟.(SUBSTR,TRIM,UPPER)
±鏃ユ湡澶勭悊鍑芥暟.(ADD_MONTHS,MONTHS_BETWEEN)
±杞崲鍑芥暟.(CONVERT,TO_DATE,TO_CHAR)
±鍏跺畠鍑芥暟.(NVL,USER,USERENV,UID)
鍐呴儴鏋勯€犲嚱鏁板湪SQL琛ㄨ揪寮忎腑鍙敤浜庣浉鍚屾暟鎹被鍨嬬殑甯告暟鍑?/span>鐜扮殑浠諱綍鍦版柟.
sql鐨?span>鏃犳暟鎹鐞?/span>(NULL鍊?/span>)
SQL閫氳繃絀哄€肩殑姒傚康鏉ュ鐞嗘暟鎹笉瀛樺湪,涓嶇‘瀹氭垨涓嶈兘鐢ㄧ殑鎯?/span>鍐?/span>.
NULL涓嶅悓浜庝竴鑸殑瀹為檯鏁版嵁,鑰屾槸涓€涓〃紺烘暟鎹笉瀛樺湪鎴栨湭鐭ョ殑鏍囧織.
鍦ㄨ澶氭儏鍐典笅,NULL瑕佹眰DBMS鐗規(guī)畩澶勭悊.±渚嬪鍦?/span>ORACLE涓€氳繃NVL鍐呴儴鏋勯€犲嚱鏁版潵澶勭悊榪欑鎯呭喌.
]]>- <SQL--琛ㄧ祼鍚堛伀銇ゃ亜銇?/title><link>http://www.aygfsteel.com/llgllg2007/archive/2009/09/24/296289.html</link><dc:creator>杈鵑Plus</dc:creator><author>杈鵑Plus</author><pubDate>Thu, 24 Sep 2009 06:42:00 GMT</pubDate><guid>http://www.aygfsteel.com/llgllg2007/archive/2009/09/24/296289.html</guid><wfw:comment>http://www.aygfsteel.com/llgllg2007/comments/296289.html</wfw:comment><comments>http://www.aygfsteel.com/llgllg2007/archive/2009/09/24/296289.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/llgllg2007/comments/commentRss/296289.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/llgllg2007/services/trackbacks/296289.html</trackback:ping><description><![CDATA[<div id="wmqeeuq" class="postTitle"><a class="postTitle2" id="homepage1_HomePageDays_DaysList_ctl09_DayItem_DayList_ctl00_TitleUrl" href="http://www.aygfsteel.com/jing-er/archive/2009/02/02/252977.html">SQL 琛ㄧ祼鍚?join) - 鍗樼磾緄愬悎銆佺瓑渚＄祼鍚堛€侀潪絳変盡緄愬悎銆佸閮ㄧ祼鍚堛€佸啀甯扮祼鍚?SQL琛ㄨ繛鎺?綆€鍗曡繛鎺ワ紝絳変環(huán)榪炴帴錛岄潪絳変環(huán)榪炴帴錛屽閮ㄨ繛鎺ワ紝鍥炲綊榪炴帴)</a> </div>
<pre>妲樸€呫仾閫ｇ祼銉嗐兗銉栥儷銇屼綔鎴愩仹銇嶃倠銇屻€佽壇銇忎嬌銇嗐倐銇伅銉撱儱銉?create view) 銇?
銇椼仸銇娿亸銇ㄥ姽鐜囥亴鑹亜銆?font color="#000000"><span style="color: #ff0000"><font style="color: #ff0000" color="#000000">鍚勭鍚勬牱鐨勮繛鎺ヨ〃涓紝鏈夌殑瀵硅鍥句篃璧蜂綔鐢ㄣ€?br />
</font></span></font>緄愬悎銇€併儐銉箋儢銉仺銉嗐兗銉栥儷銆併儞銉ャ兗銇ㄣ儞銉ャ兗銆併儐銉箋儢
銉仺銉撱儱銉箋仾銇╄闆戙伀銇с亶銈嬨€?銉嗐兗銉栥儷閫ｇ祼)<font color="#000000"><span style="color: #ff0000"><font style="color: #ff0000" color="#000000">榪炴帴鍙互鍦ㄦ暟鎹〃鍜屾暟鎹〃涔嬮棿錛岃鍥懼拰瑙嗗浘涔嬮棿錛屾暟鎹〃鍜岃鍥句箣闂村鏉傜殑榪涜銆?/font></span></font></pre>
<pre>鈻犲崢绱旂祼鍚?<span style="color: #ff0000">綆€鍗曡繛鎺?/span>
銉?nèi)潖惧疅鐨勩伀鍗樼磾绲愬悎銈掍窖潄唺櫉浼?xì)銇仾銇勩仩銈嶃亞銆?span style="color: #ff0000">瀹為檯涓婄畝鍗曠粨鍚堟病鏈変粈涔堜嬌鐢ㄧ殑鏈轟細(xì)銆?br />
</span>嬈°伄渚嬨仹銇€佸彈娉╩ 銇悇銉偝銉箋儔銇?鍝佺暘m 銇叏銉偝銉箋儔銇岀祼鍚堛仌銈屻倠銆?br />
<span style="color: #ff0000">鍦ㄤ笅闈㈢殑渚嬪瓙涓紝鍦ㄥ彈娉╩鐨勫悇縐嶈褰曢噷錛屽搧鐣猰鐨勬墍鏈夎褰曢兘琚粨鍚堜簡(jiǎn)銆?br />
</span> 鍙楁敞m 銇儸銈熾兗銉夋暟 x 鍝佺暘m 銇儸銈熾兗銉夋暟銇祼鏋溿亴鍟忋亜鍚堛倧銇曘倢銈嬨€?br />
<span style="color: #ff0000"> 鍙楁敞m鐨勮褰曟暟*鍝佺暘m鐨勮褰曟暟鐨勭粨鏋滆鏌ヨ鍑烘潵銆?/span>
select * from sak.鍙楁敞m, sak.鍝佺暘m;
鈻犵瓑渚＄祼鍚?<span style="color: #ff0000">絳変環(huán)榪炴帴</span>
銉?nèi)澀変尽绲愬悎銇€佺壒瀹氥伄銈兗銇ц〃銈掔祼鍚堛仐銇俱仚銆?span style="color: #ff0000">絳変環(huán)榪炴帴鏄敤鐗瑰畾鐨勯敭鏉ヨ繘琛岃〃鐨勭粨鍚堢殑銆?/span> <br />
鏉′歡銇仼銇°倝銇嬨伄銉囥兗銈褲亴瀛樺湪銇椼仾銇勫牬鍚堛€佺祼鏋溿偦銉冦儓銇伅鍚伨銈屻伨銇涖倱銆?br />
<span style="color: #ff0000">濡傛灉鏈夋潯浠跺湪鏁版嵁琛ㄩ噷涓嶅瓨鍦紝鍦ㄧ粨鏋滈泦閲屽氨娌℃湁榪欎竴鏉¤褰曘€?/span> <br />
鐝懼疅鐨勩伀銇閮ㄧ祼鍚堛亴涓€鐣嬌銇勩倓銇欍亜銇ㄦ€濄亜銇俱仚銆?span style="color: red">鍦ㄥ疄闄呬笂錛屽閮ㄧ粨鍚堟槸鏈€瀹規(guī)槗浣跨敤鐨勩€?br />
</span>select
鍙楁敞鐣彿,
鍙楁敞m.鍝佺暘 鍝佺暘,
鍝佺暘m.鍏ュ韓鏁?鍏ュ韓鏁?
from sak.鍙楁敞m, sak.鍝佺暘m
where 鍙楁敞m.鍝佺暘 = 鍝佺暘m.鍝佺暘 ;
銉誨垪銇垾鍚嶅畾緹┿伅銆乤s 銈掓寚瀹氥仐銇︺倐銈堛亜銆?span style="color: #ff0000">鍒楃殑鍒悕鎸囧畾錛屼篃鍙互鐢╝s鏉ュ疄鐜般€?/span> <br />
緄愬悎銉嗐兗銉栥儷銇悓銇橀爡鐩悕銇屽瓨鍦ㄣ仚銈嬪牬鍚堛伅銆併仼銇°倝銇儐銉箋儢銉爡鐩亱鎸囧畾銇欍倠銇熴倎銆併儐銉箋儢銉悕銇т慨椋俱仚銈嬨€?鍙楁敞m.鍝佺暘)<br />
<span style="color: #ff0000">鍦ㄨ繛鎺ヨ〃涓鏋滄湁鐩稿悓鐨勯」鐩悕瀛樺湪錛屼負(fù)浜?jiǎn)璁╂瘡涓€涓」鐩兘琚寚瀹氾紝灝辯敤欏圭洰鍚嶆潵淇グ銆?br />
</span>select
鍙楁敞鐣彿,
鍙楁敞m.鍝佺暘 as 鍝佺暘,
鍝佺暘m.鍏ュ韓鏁?as 鍏ュ韓鏁?
from sak.鍙楁敞m, sak.鍝佺暘m
where 鍙楁敞m.鍝佺暘 = 鍝佺暘m.鍝佺暘;
銉籭nner join 銈掍嬌鐢ㄣ仐銇︺€佺瓑渚＄祼鍚堛仚銈嬨亾銇ㄣ倐銇с亶銇俱仚銆?銈ゃ兂銉娿兗銈搞儳銈ゃ兂)<br />
<span style="color: red">浣跨敤inner join錛屼篃鍙互榪涜絳変環(huán)榪炴帴銆?br />
</span>select
鍙楁敞鐣彿,
鍙楁敞m.鍝佺暘 as 鍝佺暘,
鍝佺暘m.鍏ュ韓鏁?as 鍏ュ韓鏁?
from sak.鍙楁敞m inner join sak.鍝佺暘m on 鍙楁敞m.鍝佺暘 = 鍝佺暘m.鍝佺暘;
銉? 銇や互涓娿伄緄愬悎銈?inner join 銇ф寚瀹氥仚銈嬨伀銇€佹銇倛銇嗐伀銇欍倠銆?br />
<span style="color: red">濡傛灉鏈変笁涓互涓婅鎸囧畾inner join 鏉ヨ繘琛岃繛鎺ョ殑鏃跺€欙紝鍙互鍍忎笅闈㈣繖鏍峰仛銆?br />
</span>select
*
from (sak.鍙楁敞m inner join sak.鍝佺暘m on 鍙楁敞m.鍝佺暘 = 鍝佺暘m.鍝佺暘)
inner join sak.寰楁剰鍏坢 on 鍙楁敞m.寰楁剰鍏圕D = 寰楁剰鍏坢.寰楁剰鍏圕D;
鈻犻潪絳変盡緄愬悎 <span style="color: red">闈炵瓑浠瘋繛鎺?/span>
銉婚潪甯搞伀鏅傞枔銇亱銇嬨倠緄愬悎銇с仚銇屻€佸繀瑕併仾鍫撮潰銇屻亗銈嬨亱銈傘仐銈屻仾銇勩€?span style="color: red">铏界劧寰堣姳鏃墮棿錛屼絾鏈夋椂鍊欎篃瑕佽繘琛屼笅闈㈢殑媯€(gè)绱€€?br />
</span>銇伀銇屻仐銇嬨伄綃勫洸鏉′歡銇х祼鍚堛仚銈嬪牬鍚堛伀浣褲亜銇俱仚銆?span style="color: red">鍜屾绱㈡潯浠剁殑涓€閮ㄥ垎榪涜榪炴帴銆?<br />
<span style="color: #000000">select </span></span>鍙楁敞鐣彿,
鍙楁敞m.鍝佺暘 鍝佺暘,
鍝佺暘m.鍏ュ韓鏁?鍏ュ韓鏁?
from sak.鍙楁敞m, sak.鍝佺暘m
where 鍙楁敞m.姍熺ó like substr(鍝佺暘m.姍熺ó, 1, 2);<br />
鈻犲閮ㄧ祼鍚?<span style="color: #ff0000">澶栫祼鍚堛€佽緄愬悎銆佽閫ｇ祼銆併儐銉箋儢銉祼鍚堛€佸閮ㄦ帴鍚?br />
</span>澶栭儴榪炴帴 <span style="color: #ff0000">澶栬繛鎺ワ紝琛岃繛鎺ワ紝琛ㄨ繛鎺ワ紝澶栭儴榪炴帴<br />
</span>銉誨閮ㄧ祼鍚堛伅銆佷竴鐣倛銇忎嬌鐢ㄣ仐銇俱仚銆?span style="color: red">澶栭儴榪炴帴鏄渶緇忓父浣跨敤鐨勩€?br />
</span>涓€鏂廣伄鏉′歡銇銇欍倠銉囥兗銈褲亴瀛樺湪銇椼仾銇嬨仯銇熷牬鍚堛仹銈傜墖鏂廣伄銉囥兗銈褲倰緄愭灉銈?
銉冦儓銇惈銈併倠鎸囧畾銇屻仹銇嶃伨銇欍€?br />
<span style="color: red">瀵逛簬涓€鏂圭殑鏉′歡鍗充嬌涓嶅瓨鍦紝涔熷彲浠ヤ嬌緇撴灉闆嗗寘鍚竴杈圭殑鏁版嵁銆?br />
</span>嬈°伄渚嬨仹銇€佸搧鐣猰 銇仾銇勫搧鐣伄鍙楁敞m 銉偝銉箋儔銈傜祼鏋溿伀鍚伨銈屻伨銇欍€?br />
<span style="color: red">鍦ㄤ笅闈㈢殑渚嬪瓙涓紝鍦ㄥ搧鐣猰涓病鏈夌殑鍝佺暘鍙楁敞m璁板綍鐨勭粨鏋滀篃鍖呭惈浜?jiǎn)杩涙潵銆?br />
</span>銇撱伄鍫村悎銆佸叆搴暟銇仼銇?鍝佺暘m 闋呯洰銇伅 NULL 銇屻偦銉冦儓銇曘倢銇﹀晱銇勫悎銈忋仌
銈屻伨銇欍€侽racle 銇с伅銆乴eft join銆乺ight join 銈?(+) 銇ф寚瀹氥仹銇嶃伨銇欍€?br />
<span style="color: red">榪欐椂鍊欙紝鍏ュ簱鏁扮瓑鐨勫搧鐣猰欏圭洰閲岃璁懼畾浜?jiǎn)NULL鍊箋€傚湪oracle閲岋紝left join,right join 鍙互鐢?+)鏉ユ寚瀹氥€?br />
</span>(宸︾祼鍚堛€佸彸緄愬悎銆佽鏁般儐銉箋儢銉晱銇勫悎銈忋仜銆佽鏁般儐銉箋儢銉弬鐓?
(瑜囨暟鍟忋亜鍚堛倧銇涖€佽鍚堛儐銉箋儢銉弬鐓с€併儸銉曘儓銈搞儳銈ゃ兂銆併儵銈ゃ儓銈搞儳銈ゃ兂)<br />
<span style="color: red">(宸﹁繛鎺ワ紝鍙寵繛鎺ワ紝澶氫釜琛ㄦ煡璇紝澶氫釜琛ㄥ弬鐓э紝宸﹁繛鎺ワ紝鍙寵繛鎺?<br />
</span>select
鍙楁敞鐣彿,
鍙楁敞m.鍝佺暘 鍝佺暘,
鍝佺暘m.鍏ュ韓鏁?鍏ュ韓鏁?
from sak.鍙楁敞m, sak.鍝佺暘m
where 鍙楁敞m.鍝佺暘 = 鍝佺暘m.鍝佺暘 (+);
select
鍙楁敞鐣彿,
鍙楁敞m.鍝佺暘 鍝佺暘,
鍝佺暘m.鍏ュ韓鏁?鍏ュ韓鏁?
from sak.鍙楁敞m left join sak.鍝佺暘m on 鍙楁敞m.鍝佺暘 = 鍝佺暘m.鍝佺暘;
銉婚€嗐伀鍙楁敞m 銇仾銇勫搧鐣伄鍝佺暘m 銉偝銉箋儔銈掔祼鏋溿伀鍚伨銇涖倠銇撱仺銈傘仹銇嶃伨銇欍€?
鐝懼疅鐨勩伀銇€併亾銇嗐亜銇嗙祼鍚堛伀鎰忓懗銇亗銈娿伨銇涖倱銇屻€侀€嗐伄鍜屻倐銇с亶銈嬨仺璦€銇嗐亾
銇ㄣ仹銇欍€?br />
<span style="color: red">銉?nèi)潧稿弽涓嶅湪鍙楁敞m閲岀殑鍝佺暘m璁板綍涔熷彲浠ュ湪緇撴灉閲屽寘鍚€傚湪瀹為檯涓紝铏界劧娌℃湁榪欎箞鐢ㄧ殑錛屼絾鏄?+)涔熷彲浠ユ斁鍦?涔嬪墠銆?br />
</span>select
鍙楁敞鐣彿,
鍙楁敞m.鍝佺暘 鍝佺暘,
鍝佺暘m.鍏ュ韓鏁?鍏ュ韓鏁?
from sak.鍙楁敞m, sak.鍝佺暘m
where 鍙楁敞m.鍝佺暘 (+) = 鍝佺暘m.鍝佺暘;
select
鍙楁敞鐣彿,
鍙楁敞m.鍝佺暘 鍝佺暘,
鍝佺暘m.鍏ュ韓鏁?鍏ュ韓鏁?
from sak.鍙楁敞m right join sak.鍝佺暘m on 鍙楁敞m.鍝佺暘 = 鍝佺暘m.鍝佺暘;
銉諱笁銇や互涓娿伄琛ㄣ倰緄愬悎銇欍倠銇撱仺銈傘仹銇嶃伨銇欍€?3 銉嗐兗銉栥儷緄愬悎)<br />
<span style="color: red">銉諱篃鍙互榪涜涓変釜琛ㄤ互涓婄殑琛ㄨ繛鎺ャ€傦紙涓夎〃榪炴帴錛?/span><br />
嬈°伄渚嬨仹銇€佸搧鐣伀瀵俱仚銈嬪搧鐣猰.鍏ュ韓鏁般€佸緱鎰忓厛CD 銇銇欍倠寰楁剰鍏坢.寰楁剰
鍏堝悕銈掔祼鍚堛仐銇︺亜銇俱仚銆?left join 銈掍嬌鐢ㄣ仐銇︺倐鑹亜銆?<br />
<span style="color: red">鍦ㄤ笅闈㈢殑渚嬪瓙涓紝瀵逛簬鍝佺暘鐨勫搧鐣猰.鍏ュ簱鏁幫紝瀵逛簬寰楁剰鍏圕D鐨勫緱鎰忓厛m.寰楁剰鍏堝悕鏉ヨ繘琛岃繛鎺ャ€傦紙涔熷彲浠ヤ嬌鐢ㄥ乏榪炴帴錛?br />
</span>select
鍙楁敞鐣彿,
鍙楁敞m.鍝佺暘 鍝佺暘,
鍝佺暘m.鍏ュ韓鏁? 鍏ュ韓鏁?
鍙楁敞m.寰楁剰鍏圕D 寰楁剰鍏圕D,
寰楁剰鍏坢.寰楁剰鍏堝悕 寰楁剰鍏?
from sak.鍙楁敞m, sak.鍝佺暘m, sak.寰楁剰鍏坢
where 鍙楁敞m.鍝佺暘 = 鍝佺暘m.鍝佺暘 (+)
and 鍙楁敞m.寰楁剰鍏圕D = 寰楁剰鍏坢.寰楁剰鍏圕D (+);
select
鍙楁敞鐣彿,
鍙楁敞m.鍝佺暘 鍝佺暘,
鍝佺暘m.鍏ュ韓鏁? 鍏ュ韓鏁?
鍙楁敞m.寰楁剰鍏圕D 寰楁剰鍏圕D,
寰楁剰鍏坢.寰楁剰鍏堝悕 寰楁剰鍏?
from (sak.鍙楁敞m left join sak.鍝佺暘m on 鍙楁敞m.鍝佺暘 = 鍝佺暘m.鍝佺暘)
left join sak.寰楁剰鍏坢 on 鍙楁敞m.寰楁剰鍏圕D = 寰楁剰鍏坢.寰楁剰鍏圕D;
銉昏鏁般伄琛ㄣ倰緄愬悎銇欍倠銇ㄤ慨椋俱亴闆ｈВ銇仾銈娿亴銇°仾銇仹銆併儐銉箋儢銉垾鍚嶃倰浣褲亞銇?
鑹亜銇с仚銆?br />
<span style="color: red">濡傛灉澶氫釜琛ㄨ繘琛岃繛鎺ワ紝淇グ浼?xì)鍙樺緱寰堝鏉傚Q屼篃鍙互浣跨敤琛ㄥ埆鍚嶃€?br />
</span>select
鍙楁敞鐣彿,
a.鍝佺暘 鍝佺暘,
b.鍏ュ韓鏁? 鍏ュ韓鏁?
a.寰楁剰鍏圕D 寰楁剰鍏圕D,
c.寰楁剰鍏堝悕 寰楁剰鍏?
from sak.鍙楁敞m a, sak.鍝佺暘m b, sak.寰楁剰鍏坢 c
where a.鍝佺暘 = b.鍝佺暘 (+)
and a.寰楁剰鍏圕D = c.寰楁剰鍏圕D (+);
** 澶栭儴緄愬悎銈掓槑紺恒仚銈嬨仧銈併伀 left join 銈?left outer join銆乺ight join
銈?right outer join 銇ㄦ浉銇忋亾銇ㄣ倐銇с亶銈嬨€?br />
<span style="color: red">** 涓轟簡(jiǎn)鏄庣‘澶栭儴榪炴帴錛屼篃鍙互鎶妉eft join 鍐欐垚 left outer join, right join鍐欐垚right outer join銆?br />
</span>(銈€偊銈褲兗銈搞儳銈ゃ兂銆併儸銉曘儓銈€偊銈褲兗銈搞儳銈ゃ兂銆併儵銈ゃ儓銈€偊銈褲兗銈搞儳銈ゃ兂)<br />
<span style="color: red">錛坥uter銆€join, left outer join, right outer join錛?br />
</span>鈻犲啀甯扮祼鍚?鍐呴儴緄愬悎) 鍥炲綊榪炴帴錛堝唴閮ㄧ粨鍚堬級(jí)
銉誨啀甯扮祼鍚堛伅銆佸悓銇樸儐銉箋儢銉倰銉嗐兗銉栥儷鍒ュ悕銈掍嬌鐢ㄣ仐銇︾祼鍚堛仐銇俱仚銆?br />
<span style="color: red">銉誨洖褰掕繛鎺ユ槸鐩稿悓鐨勮〃鏉ョ敤鍒悕鏉ヨ繘琛岃繛鎺ョ殑銆?br />
</span>嬈°伄渚嬨仹銇€佸緱鎰忓厛m 銇Κ寰楁剰鍏圕D 銇屻亗銈嬨仺銇椼仸銆併仢銇緱鎰忓厛鍚嶃倰鑷垎鑷?
韜仺緄愬悎銇椼仸銇勩伨銇欍€?鑷繁緄愬悎)<br />
<span style="color: red">鍦ㄤ笅闈㈢殑渚嬪瓙涓紝浠ュ緱鎰忓厛浣滀負(fù)鐖跺緱鎰忓厛錛岀劧鍚庣敤榪欎釜鍚嶅瓧鏉ヨ繘琛岃嚜韜繛鎺ャ€?br />
</span>select
a.寰楁剰鍏圕D 寰楁剰鍏圕D,
a.寰楁剰鍏堝悕 寰楁剰鍏?
a.瑕緱鎰忓厛CD 瑕緱鎰忓厛CD,
b.寰楁剰鍏堝悕 寰楁剰鍏?
from sak.寰楁剰鍏坢 a, sak.寰楁剰鍏坢 b
where a.寰楁剰鍏圕D = b.瑕緱鎰忓厛CD (+);
</pre>
<img src ="http://www.aygfsteel.com/llgllg2007/aggbug/296289.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/llgllg2007/" target="_blank">杈鵑Plus</a> 2009-09-24 14:42 <a href="http://www.aygfsteel.com/llgllg2007/archive/2009/09/24/296289.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item><item><title>***銈楓偣銉嗐儬銇枊鐧虹挵澧冦伀銇ゃ亜銇︼紙2009/07~2009/09錛?/title><link>http://www.aygfsteel.com/llgllg2007/archive/2009/09/24/296286.html</link><dc:creator>杈鵑Plus</dc:creator><author>杈鵑Plus</author><pubDate>Thu, 24 Sep 2009 06:30:00 GMT</pubDate><guid>http://www.aygfsteel.com/llgllg2007/archive/2009/09/24/296286.html</guid><wfw:comment>http://www.aygfsteel.com/llgllg2007/comments/296286.html</wfw:comment><comments>http://www.aygfsteel.com/llgllg2007/archive/2009/09/24/296286.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/llgllg2007/comments/commentRss/296286.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/llgllg2007/services/trackbacks/296286.html</trackback:ping><description><![CDATA[****銈楓偣銉嗐儬<br />
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銆€銇傘倞銇俱仜銈撱伄銇с€併仢銇競(jìng)銈娿伅鍙傝€冦伀銇椼仸涓嬨仌銇勩€?/p>
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銆€銆€銆€銆€銆€銆€銆€Tomcat 6.0.x銆丣2SE 5.0.x<br />
銆€銆€銆€銆€銆€銆€銆€Windows Server 2008 Standard (EMT64)</p>
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