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>&#20037;&#20037;&#57;&#49;&#31934;&#21697;&#22269;&#20135;&#57;&#49;&#20037;&#20037;&#20037;&#44;&#20037;&#20037;&#20037;&#27700;&#34588;&#26691;&#44;&#20122;&#27954;&#32508;&#21512;&#32593;&#20013;&#24515;</title><link>http://www.aygfsteel.com/michaellee/category/40704.html</link><description>鍐嶇儲錛屼篃鍒繕寰瑧錛涘啀鎬ワ紝涔熻娉ㄦ剰璇皵錛涘啀鑻︼紝涔熷埆蹇樺潥鎸侊紱鍐嶇瘡錛屼篃瑕佺埍鑷繁
</description><language>zh-cn</language><lastBuildDate>Mon, 21 Dec 2009 22:12:02 GMT</lastBuildDate><pubDate>Mon, 21 Dec 2009 22:12:02 GMT</pubDate><ttl>60</ttl><item><title>鏁版嵁搴撴煡璇紭鍖栨柟妗堬紙澶勭悊涓婄櫨涓囩駭璁板綍濡備綍鎻愰珮澶勭悊鏌ヨ閫熷害錛?
</title><link>http://www.aygfsteel.com/michaellee/archive/2009/12/19/306666.html</link><dc:creator>MichaelLee</dc:creator><author>MichaelLee</author><pubDate>Sat, 19 Dec 2009 07:23:00 GMT</pubDate><guid>http://www.aygfsteel.com/michaellee/archive/2009/12/19/306666.html</guid><wfw:comment>http://www.aygfsteel.com/michaellee/comments/306666.html</wfw:comment><comments>http://www.aygfsteel.com/michaellee/archive/2009/12/19/306666.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/michaellee/comments/commentRss/306666.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/michaellee/services/trackbacks/306666.html</trackback:ping><description><![CDATA[&nbsp;&nbsp;&nbsp;&nbsp; 鎽樿: 1.瀵規(guī)煡璇㈣繘琛屼紭鍖栵紝搴斿敖閲忛伩鍏嶅叏琛ㄦ壂鎻忥紝棣栧厛搴旇�冭檻鍦?where 鍙?order by 娑夊強鐨勫垪涓婂緩绔嬬儲寮曘�?<br>2.搴斿敖閲忛伩鍏嶅湪 where 瀛愬彞涓瀛楁榪涜 null 鍊煎垽鏂紝鍚﹀垯灝嗗鑷村紩鎿庢斁寮冧嬌鐢ㄧ儲寮曡�岃繘琛屽叏琛ㄦ壂鎻忥紝濡傦細
<br>select id from t where num is null
<br>鍙互鍦╪um涓婅緗粯璁ゅ�?錛岀‘淇濊〃涓璶um鍒楁病鏈塶ull鍊鹼紝鐒跺悗榪欐牱鏌ヨ錛?<br>select id from t where num=0&nbsp;&nbsp;<a href='http://www.aygfsteel.com/michaellee/archive/2009/12/19/306666.html'>闃呰鍏ㄦ枃</a><img src ="http://www.aygfsteel.com/michaellee/aggbug/306666.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/michaellee/" target="_blank">MichaelLee</a> 2009-12-19 15:23 <a href="http://www.aygfsteel.com/michaellee/archive/2009/12/19/306666.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item><item><title>sql璇硶/鐢ㄦ硶鏁寸悊錛堜慨姝ｇ増錛?/title><link>http://www.aygfsteel.com/michaellee/archive/2009/11/23/303354.html</link><dc:creator>MichaelLee</dc:creator><author>MichaelLee</author><pubDate>Mon, 23 Nov 2009 08:10:00 GMT</pubDate><guid>http://www.aygfsteel.com/michaellee/archive/2009/11/23/303354.html</guid><wfw:comment>http://www.aygfsteel.com/michaellee/comments/303354.html</wfw:comment><comments>http://www.aygfsteel.com/michaellee/archive/2009/11/23/303354.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/michaellee/comments/commentRss/303354.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/michaellee/services/trackbacks/303354.html</trackback:ping><description><![CDATA[&nbsp;&nbsp;&nbsp;&nbsp; 鎽樿: 鏈�鍚庯紝鍐嶈ˉ鍏呬竴浜涳細
<br>
<br>鍒嗙粍group
<br>
<br>銆�銆�甯哥敤浜庣粺璁℃椂錛屽鍒嗙粍鏌ユ�繪暟錛?<br>select gender,count(sno)
<br>from students
<br>group by gender
<br>(鏌ョ湅鐢峰コ瀛︾敓鍚勬湁澶氬皯)
<br>
<br>銆�銆�娉ㄦ剰錛氫粠鍝瑙掑害鍒嗙粍灝變粠鍝垪"group by"&nbsp;&nbsp;<a href='http://www.aygfsteel.com/michaellee/archive/2009/11/23/303354.html'>闃呰鍏ㄦ枃</a><img src ="http://www.aygfsteel.com/michaellee/aggbug/303354.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/michaellee/" target="_blank">MichaelLee</a> 2009-11-23 16:10 <a href="http://www.aygfsteel.com/michaellee/archive/2009/11/23/303354.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item><item><title>SQL璇彞 SELECT LIKE like鐢ㄦ硶璇﹁В</title><link>http://www.aygfsteel.com/michaellee/archive/2009/11/23/303353.html</link><dc:creator>MichaelLee</dc:creator><author>MichaelLee</author><pubDate>Mon, 23 Nov 2009 08:06:00 GMT</pubDate><guid>http://www.aygfsteel.com/michaellee/archive/2009/11/23/303353.html</guid><wfw:comment>http://www.aygfsteel.com/michaellee/comments/303353.html</wfw:comment><comments>http://www.aygfsteel.com/michaellee/archive/2009/11/23/303353.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/michaellee/comments/commentRss/303353.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/michaellee/services/trackbacks/303353.html</trackback:ping><description><![CDATA[&nbsp;&nbsp;&nbsp;&nbsp; 鎽樿: LIKE璇彞鐨勮娉曟牸寮忔槸錛歴elect * from 琛ㄥ悕 where 瀛楁鍚?like 瀵瑰簲鍊鹼紙瀛愪覆錛夛紝瀹冧富瑕佹槸閽堝瀛楃鍨嬪瓧孌電殑錛屽畠鐨勪綔鐢ㄦ槸鍦ㄤ竴涓瓧絎﹀瀷瀛楁鍒椾腑媯�绱㈠寘鍚搴斿瓙涓茬殑銆?&nbsp;&nbsp;<a href='http://www.aygfsteel.com/michaellee/archive/2009/11/23/303353.html'>闃呰鍏ㄦ枃</a><img src ="http://www.aygfsteel.com/michaellee/aggbug/303353.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/michaellee/" target="_blank">MichaelLee</a> 2009-11-23 16:06 <a href="http://www.aygfsteel.com/michaellee/archive/2009/11/23/303353.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item><item><title>SQL PRIMARY KEY 綰︽潫</title><link>http://www.aygfsteel.com/michaellee/archive/2009/11/23/303348.html</link><dc:creator>MichaelLee</dc:creator><author>MichaelLee</author><pubDate>Mon, 23 Nov 2009 07:35:00 GMT</pubDate><guid>http://www.aygfsteel.com/michaellee/archive/2009/11/23/303348.html</guid><wfw:comment>http://www.aygfsteel.com/michaellee/comments/303348.html</wfw:comment><comments>http://www.aygfsteel.com/michaellee/archive/2009/11/23/303348.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/michaellee/comments/commentRss/303348.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/michaellee/services/trackbacks/303348.html</trackback:ping><description><![CDATA[&nbsp;&nbsp;&nbsp;&nbsp; 鎽樿: PRIMARY KEY 綰︽潫鍞竴鏍囪瘑鏁版嵁搴撹〃涓殑姣忔潯璁板綍銆?<br>
<br>涓婚敭蹇呴』鍖呭惈鍞竴鐨勫�箋�?<br>
<br>涓婚敭鍒椾笉鑳藉寘鍚?NULL 鍊箋�?<br>
<br>姣忎釜琛ㄥ簲璇ラ兘涓�涓富閿紝騫朵笖姣忎釜琛ㄥ彧鑳芥湁涓�涓富閿�?<br>SQL PRIMARY KEY Constraint on CREATE TABLE&nbsp;&nbsp;<a href='http://www.aygfsteel.com/michaellee/archive/2009/11/23/303348.html'>闃呰鍏ㄦ枃</a><img src ="http://www.aygfsteel.com/michaellee/aggbug/303348.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/michaellee/" target="_blank">MichaelLee</a> 2009-11-23 15:35 <a href="http://www.aygfsteel.com/michaellee/archive/2009/11/23/303348.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item><item><title>oracle鎬庝箞瀹炵幇宸﹁仈錛屽彸鑱斾笌澶栬仈?9i浠ュ墠鍐欐硶 9i浠ュ悗10g 11g鐨勫啓娉?/title><link>http://www.aygfsteel.com/michaellee/archive/2009/07/08/285907.html</link><dc:creator>MichaelLee</dc:creator><author>MichaelLee</author><pubDate>Wed, 08 Jul 2009 02:19:00 GMT</pubDate><guid>http://www.aygfsteel.com/michaellee/archive/2009/07/08/285907.html</guid><wfw:comment>http://www.aygfsteel.com/michaellee/comments/285907.html</wfw:comment><comments>http://www.aygfsteel.com/michaellee/archive/2009/07/08/285907.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/michaellee/comments/commentRss/285907.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/michaellee/services/trackbacks/285907.html</trackback:ping><description><![CDATA[宸﹁仈錛?br />
select a.id,a.name,b.address from a,b<br />
where a.id=b.id(+)<br />
鍙寵仈:<br />
select a.id,a.name,b.address from a,b<br />
where a.id(+)=b.id<br />
澶栬仈<br />
SELECT a.id,a.name,b.address<br />
FROM a,b<br />
WHERE a.id = b.id(+)<br />
UNION<br />
<br />
SELECT b.id,'' name,b.address<br />
FROM b<br />
WHERE NOT EXISTS (<br />
SELECT * FROM a<br />
WHERE a.id = b.id);<br />
鍦?i浠ヤ笂錛屽凡緇忓紑濮嬫敮鎸丼QL99鏍囧噯錛屾墍浠ワ紝浠ヤ笂璇彞鍙互鍐欐垚錛?br />
榛樿鍐呴儴鑱旂粨錛?br />
select a.id,a.name,b.address,c.subject<br />
from (a inner join b on a.id=b.id)<br />
inner join c on b.name = c.name<br />
where other_clause<br />
宸﹁仈<br />
select a.id,a.name,b.address<br />
from a left outer join b on a.id=b.id<br />
where other_clause<br />
鍙寵仈<br />
select a.id,a.name,b.address<br />
from a right outer join b on a.id=b.id<br />
where other_clause<br />
澶栬仈<br />
select a.id,a.name,b.address<br />
from a full outer join b on a.id=b.id<br />
where other_clause<br />
or<br />
select a.id,a.name,b.address<br />
from a full outer join b using (id)<br />
where other_clause<br />
<img src ="http://www.aygfsteel.com/michaellee/aggbug/285907.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/michaellee/" target="_blank">MichaelLee</a> 2009-07-08 10:19 <a href="http://www.aygfsteel.com/michaellee/archive/2009/07/08/285907.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item></channel></rss>                     <footer>
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