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>&#20122;&#27954;&#118;&#97;&#20037;&#20037;&#20037;&#22108;&#22108;&#22108;&#20037;&#20037;&#44;&#20122;&#27954;&#20154;&#25104;&#28608;&#24773;&#22312;&#32447;&#25773;&#25918;&#44;&#20122;&#27954;&#20154;&#25104;&#32593;&#31449;&#35266;&#30475;&#22312;&#32447;&#25773;&#25918;</title><link>http://www.tkk7.com/yjhmily/category/18395.html</link><description>鍧氭寔璧拌嚜宸辯殑璺�︹�?
</description><language>zh-cn</language><lastBuildDate>Mon, 15 Mar 2010 08:58:48 GMT</lastBuildDate><pubDate>Mon, 15 Mar 2010 08:58:48 GMT</pubDate><ttl>60</ttl><item><title>鑰佹湁浜洪棶鎴戝叧浜庡乏榪炴帴銆佸彸榪炴帴鐨勯棶棰橈紝灝忚В鏋愪竴涓嬪惂</title><link>http://www.tkk7.com/yjhmily/archive/2010/03/14/315335.html</link><dc:creator>kangxm</dc:creator><author>kangxm</author><pubDate>Sun, 14 Mar 2010 10:25:00 GMT</pubDate><guid>http://www.tkk7.com/yjhmily/archive/2010/03/14/315335.html</guid><wfw:comment>http://www.tkk7.com/yjhmily/comments/315335.html</wfw:comment><comments>http://www.tkk7.com/yjhmily/archive/2010/03/14/315335.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.tkk7.com/yjhmily/comments/commentRss/315335.html</wfw:commentRss><trackback:ping>http://www.tkk7.com/yjhmily/services/trackbacks/315335.html</trackback:ping><description><![CDATA[&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;鍋囪鎴戜滑鐜板湪鏈塽ser鍜宱rg涓ゅ紶琛細(xì)<br />
1銆乽ser鐢ㄦ埛琛?瀛楁鍖呭惈錛歩d銆乶ame銆乷rgId 鍏朵腑orgId鏍囩ず璇ョ敤鎴鋒墍灞炵殑緇勭粐<br />
2銆乷rg緇勭粐琛?nbsp;&nbsp; 瀛楁鍖呭惈錛歩d銆乶ame<br />
涓よ〃涔嬮棿鐨勫叧緋誨緢綆�鍗曪紝涓�涓粍緇囦笅浼?xì)鎷ユ湁澶氫釜鐢ㄦ堷P紝涓�涓敤鎴峰睘浜庢煇涓粍緇囥�?br />
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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;鍦ㄨВ鏋愪箣鍓嶅厛鏅強(qiáng)涓�涓嬫暟鎹簱絀哄�?null)鐨勬蹇碉細(xì)<br />
鏈夊緢澶氭椂鍊欐垜浠兘鑳界鍒版煇琛ㄤ腑鏌愬瓧孌靛�間負(fù)絀虹殑鎯呭喌錛岀┖鍊間笉絳夊悓浜庡瓧絎︿覆涓殑絀烘牸銆佺┖涓?br />
涔熶笉絳夊悓浜庢暟瀛楃被鍨嬬殑0錛屾墍浠ワ紝涓�鑸垜浠敤IS NULL 鍏抽敭瀛楁潵媯�(gè)绱㈡湁絀哄�煎瓧孌電殑璁板綍銆傝�屼笉鏄敤!=銆?lt;&gt;榪欎簺鍒ゆ柇絎︺�?br />
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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;鎺ヤ笅鏉ワ紝鎴戜滑緇欑ず渚嬪簱琛ㄤ腑鍋氫笂涓�浜涙祴璇曟暟鎹紝濡備笅鍥撅細(xì)<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <img height="160" alt="" src="http://www.tkk7.com/images/blogjava_net/yjhmily/user.JPG" width="260" border="0" />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <img height="130" alt="" src="http://www.tkk7.com/images/blogjava_net/yjhmily/org.JPG" width="189" border="0" /><br />
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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;鏈変簡(jiǎn)榪欎簺鏁版嵁錛屽挶浠氨鍙互榪涘叆姝ｉ鍟︼細(xì)<br />
涓�銆佸乏榪炴帴銆佸彸榪炴帴<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span style="color: #3366ff">A Left join錛堝乏榪炴帴錛変紭鍏堣В鍑哄乏琛ㄤ腑鎵�鏈夌殑璁板綍錛屽寘鍚彸琛ㄤ腑娌℃湁鍖歸厤鍒板緱璁板綍銆?br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A&nbsp;Right join錛堝彸榪炴帴錛変紭鍏堣В鍑哄彸琛ㄤ腑鎵�鏈夌殑璁板綍錛屽寘鍚乏琛ㄤ腑娌℃湁鍖歸厤鍒板緱璁板綍銆?/span><br />
宸﹀彸榪炴帴鏄浉浜掑搴旂殑錛屾墍浠ュ湪榪欓噷涓�騫惰В閲娿�?br />
緗楀棪涓�鍙ュ浣曞尯鍒嗗乏琛ㄥ拰鍙寵〃錛?br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span style="color: #ff0000">鍦↗OIN鐨勫乏杈瑰嚭鐜扮殑琛ㄥ彨宸﹁〃錛屽湪JOIN鐨勫彸杈瑰嚭鐜扮殑琛ㄥ彨鍙寵〃</span><br />
鍏蜂綋浣撶幇鍦⊿QL璇彞涓婂嵆錛氾紙浠ュ乏榪炴帴涓轟緥錛?br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;宸﹁繛鎺ヨ鍙ワ細(xì)SELECT user.name,org.name FROM user <span style="color: #ff0000">LEFT JOIN</span> org ON &nbsp;user.orgId = org.id<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;鍙抽摼鎺ヨ鍙ワ細(xì)SELECT user.name,org.name FROM user <span style="color: #ff0000">RIGHT JOIN </span>org ON&nbsp; user.orgId = org.id<br />
鏄捐�屾槗瑙侊紝璇QL涓紝user涓哄乏琛ㄣ�乷rg涓哄彸琛?br />
涓嬮潰鎴戜滑鏉ョ湅鐪嬭繖涓や釜璇彞鍒嗗埆鎵ц鍚庣殑鏁堟灉錛?br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <img height="172" alt="" src="http://www.tkk7.com/images/blogjava_net/yjhmily/left.JPG" width="211" border="0" />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp; &nbsp;<img height="167" alt="" src="http://www.tkk7.com/images/blogjava_net/yjhmily/right.JPG" width="216" border="0" />&nbsp;&nbsp;<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;涓轟簡(jiǎn)鏇村ソ鐨勭湅鍑哄乏鍙寵繛鎺ョ殑鏁堟灉錛屾垜浠啀鏉ョ湅鐪嬪唴榪炴帴鏌ヨ鍑烘潵鐨勬晥鏋?br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;鍐呰繛鎺ワ細(xì)SELECT user.name,org.name FROM user JOIN org ON&nbsp; user.orgId = org.id<br />
鍐呰繛鎺ヨ鍙ユ墽琛屽悗鐨勬晥鏋滐細(xì)<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<img alt="" src="http://www.tkk7.com/images/blogjava_net/yjhmily/inner.JPG" border="0" /><br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;寰堟槑鏄撅細(xì)<br />
<span style="color: #3366ff">鍐呰繛鎺ヤ笌宸﹁繛鎺ョ浉姣旓紝媯�(gè)绱㈢粨鏋滈泦涓紡鎺変簡(jiǎn)user琛ㄧ殑user3鏁版嵁<br />
鍐呰繛鎺ヤ笌鍙寵繛鎺ョ浉姣旓紝媯�(gè)绱㈢粨鏋滈泦涓紡鎺変簡(jiǎn)org琛ㄧ殑org4鏁版嵁<br />
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<img src ="http://www.tkk7.com/yjhmily/aggbug/315335.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.tkk7.com/yjhmily/" target="_blank">kangxm</a> 2010-03-14 18:25 <a href="http://www.tkk7.com/yjhmily/archive/2010/03/14/315335.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item><item><title>媯�(gè)绱㈡暟鎹簱琛ㄤ腑鐨勪笉閲嶅璁板綍</title><link>http://www.tkk7.com/yjhmily/archive/2006/12/15/87893.html</link><dc:creator>kangxm</dc:creator><author>kangxm</author><pubDate>Fri, 15 Dec 2006 03:24:00 GMT</pubDate><guid>http://www.tkk7.com/yjhmily/archive/2006/12/15/87893.html</guid><wfw:comment>http://www.tkk7.com/yjhmily/comments/87893.html</wfw:comment><comments>http://www.tkk7.com/yjhmily/archive/2006/12/15/87893.html#Feedback</comments><slash:comments>1</slash:comments><wfw:commentRss>http://www.tkk7.com/yjhmily/comments/commentRss/87893.html</wfw:commentRss><trackback:ping>http://www.tkk7.com/yjhmily/services/trackbacks/87893.html</trackback:ping><description><![CDATA[&nbsp;&nbsp;&nbsp;&nbsp; 鎽樿: 鐩鎬俊寰堝浜哄湪鏌ヨ鏁版嵁搴撴椂閮戒細(xì)紕板埌媯�(gè)绱㈡煇琛ㄤ腑涓嶉噸澶嶈褰曠殑鏃跺�?鎻愬埌媯�(gè)绱笉閲嶅璁板綍,椹笂鎯沖埌鐨勮偗瀹氭槸Distinct鎴栬�匞roup By鍒嗙粍,
<br>灝忓紵鍦ㄥ垵嬈′嬌鐢ㄧ殑鏃跺�欑鍒頒簡(jiǎn)涓�浜涢夯鐑?榪欓噷鎷垮嚭鏉ヤ笌澶у鍒嗕韓,甯屾湜瀵規(guī)洿澶氱殑鏈嬪弸鏈夋墍甯姪!&nbsp;&nbsp;<a href='http://www.tkk7.com/yjhmily/archive/2006/12/15/87893.html'>闃呰鍏ㄦ枃</a><img src ="http://www.tkk7.com/yjhmily/aggbug/87893.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.tkk7.com/yjhmily/" target="_blank">kangxm</a> 2006-12-15 11:24 <a href="http://www.tkk7.com/yjhmily/archive/2006/12/15/87893.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item></channel></rss>                   <footer>
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