]]>修改MySQL用户密码的方?/title>http://www.aygfsteel.com/airdream/archive/2006/06/23/54614.htmlAIRDREAMAIRDREAMFri, 23 Jun 2006 01:36:00 GMThttp://www.aygfsteel.com/airdream/archive/2006/06/23/54614.htmlhttp://www.aygfsteel.com/airdream/comments/54614.htmlhttp://www.aygfsteel.com/airdream/archive/2006/06/23/54614.html#Feedback0http://www.aygfsteel.com/airdream/comments/commentRss/54614.htmlhttp://www.aygfsteel.com/airdream/services/trackbacks/54614.html例如修改root用户密码 GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY PASSWORD 'yournewpassword' WITH GRANT OPTION;
]]>SQL 技?/title>http://www.aygfsteel.com/airdream/archive/2006/06/21/54296.htmlAIRDREAMAIRDREAMWed, 21 Jun 2006 08:30:00 GMThttp://www.aygfsteel.com/airdream/archive/2006/06/21/54296.htmlhttp://www.aygfsteel.com/airdream/comments/54296.htmlhttp://www.aygfsteel.com/airdream/archive/2006/06/21/54296.html#Feedback0http://www.aygfsteel.com/airdream/comments/commentRss/54296.htmlhttp://www.aygfsteel.com/airdream/services/trackbacks/54296.html见下? SQL> SELECT * FROM CHECKS ORDER BY 1Q(按照W一列排序)
]]>SQL里的集合q算http://www.aygfsteel.com/airdream/archive/2006/06/21/54282.htmlAIRDREAMAIRDREAMWed, 21 Jun 2006 07:43:00 GMThttp://www.aygfsteel.com/airdream/archive/2006/06/21/54282.htmlhttp://www.aygfsteel.com/airdream/comments/54282.htmlhttp://www.aygfsteel.com/airdream/archive/2006/06/21/54282.html#Feedback0http://www.aygfsteel.com/airdream/comments/commentRss/54282.htmlhttp://www.aygfsteel.com/airdream/services/trackbacks/54282.html输入: SQL> SELECT * FROM FOOTBALL 输出: NAME Q-Q-Q- ABLE BRAVO CHARLIE DECON EXITOR FUBAR GOOBE 7 rows selected. Q-Q-Q-Q- 输入: SQL> SELECT * FROM SOFTBALL 输出: NAME Q-Q-Q? ABLE BAKER CHARLIE DEAN EXITOR FALCONER GOOBER 7 rows selected. Q-Q-Q-Q- 在这两个表中有哪些不重复的h员呢 输入/输出: SQL> SELECT NAME FROM SOFTBALL 2 UNION 3 SELECT NAME FROM FOOTBALL NAME Q-Q-Q-Q? ABLE BAKER BRAVO CHARLIE DEAN DECON EXITOR FALCONER FUBAR GOOBER 10 rows selected. Q-Q-Q-Q-Q- UNION q回了两个表中的10 个记录它们是不重复的但是两个表中共有多少人呢包括重复的h?br />输入/输出: SQL> SELECT NAME FROM SOFTBALL 2 UNION ALL 3 SELECT NAME FROM FOOTBALL NAME Q-Q-Q-Q-Q- ABLE BAKER CHARLIE DEAN EXITOR FALCONER GOOBER ABLE BRAVO CHARLIE DECON EXITOR FUBAR GOOBER 14 rows selected. Q-Q-Q-Q-Q-Q-Q-Q-Q- 分析可以看到UNION ALL 与UNION 一样对表进行了合ƈ但是它不L重复的记?br />可是如果我们想知道都有谁同时在两个表中呢UNION 无法做到q一Ҏ(gu)们需要学?fn)?INTERSECT INTERSECT 怺 INTERSECT q回两个表中共有的行看下例它?yu)返回两个表中有存在的员?br />输入: SQL> SELECT * FROM FOOTBALL 2 INTERSECT 3 SELECT * FROM SOFTBALL 输出 NAME Q-Q-Q-Q- ABLE CHARLIE EXITOR GOOBER Q-Q-Q-Q- 分析q些记录是两个表中都存在?MINUS 相减 MINUS q回的记录是存在于第一个表中但不存在于W二个表中的记录 例如输入: SQL> SELECT * FROM FOOTBALL MINUS SELECT * FROM SOFTBALL 输出 NAME Q-Q-Q-Q- BRAVO DECON FUBAR Q-Q-Q-Q- 上例中显CZ三个不在垒球队中的球队员如果你把语句的ơ序颠倒那么你得到在垒球队中但不在球队中的队员 输入: SQL> SELECT * FROM SOFTBALL MINUS SELECT * FROM FOOTBALL 输出 NAME Q-Q-Q-Q? BAKER DEAN FALCONER Q-Q-Q-Q-