Ò׽ؽØÍ¼Èí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

mysql ³£ÓþÙÀý

drop table student;
create table student
(sno   int   not null unique,
 sname varchar(8) not null,
 ssex  char(2)    not null,
 sage int ,
 sdept varchar(20));
 
 select * from student;
 alter table student drop unique(sno);
 alter table student modify sno primary key;
 alter table student add constraints con_s check(ssex in('F', 'M'));
 
 insert into  student values ('0001', 'zhangwen', 'F', 24, 'math');
 insert into  student values ('0201', 'zhangzi', 'F', 24, 'jsj');
 insert into  student values ('0002', 'wangjing', 'M', 22, 'math');
 insert into  student values ('0301', 'lilu', 'M', 23, 'wuli');
 insert into  student values ('0003', 'wujun', 'M', 24, 'math');
 insert into  student values ('0202', 'wangli', 'F', 23, 'jsj');
 insert into  student values ('0203', 'jiangmin', 'M', 23, 'jsj');
 insert into  student values ('0302', 'lixiang', 'F', 23, 'wuli');
 insert into  student values ('0303', 'jinmin', 'F', 24, 'wuli');
 insert into  student values ('0304', 'jinmin', 'F', null, 'wuli');
 insert into  student values ('0204', 'jinmin', 'F', 22, '');
 delete from student where sno = '0204';
 update student set sname = 'luyong' where sno = '0304';
 insert into student values('0004','meinv','M',22,'math');
 insert into student values('0006','beauty','M',21,'math');
 ----------------------------------------------
 drop table course;
 create table course(cno int primary key,
                     cname varchar2(10) not null,
                     ccredite float(2));
        


Ïà¹ØÎĵµ£º

¾­µäµÄMYSQLÓï¾ä

·Ç³£³£Óõģº¾­µäµÄMYSQLÓï¾ä…… php¿ªÔ´
ÕâÕæÊÇÒ»¸öºÃ¶«Î÷£ºÑ§Ï°ºÃÁ˺ÜÊÜÓõÄŶ……
SQL·ÖÀࣺ
DDL—Êý¾Ý¶¨ÒåÓïÑÔ(Create£¬Alter£¬Drop£¬DECLARE)
DML—Êý¾Ý²Ù×ÝÓïÑÔ(Select£¬Delete£¬Update£¬Insert)
DCL—Êý¾Ý¿ØÖÆÓïÑÔ(GRANT£¬REVOKE£¬COMMIT£¬ROLLBACK)php¿ªÔ´
Ê×ÏÈ,¼òÒ ......

MySQL¶¯Ô±14000ÈËÇ©Ãû·´¶Ô¼×¹ÇÎÄSun½»Ò×

¾Ý¹úÍâýÌ屨µÀ£¬MySQLÊý¾Ý¿âµÄ¿ª·¢ÕßMichael WideniusÒÔ¼°²¿·ÖÏà¹ØÈËÊ¿½üÈÕÏòÅ·ÖÞ¡¢ÖйúÓë¶íÂÞ˹µÄ¼à¹Ü»ú¹¹Ìá½»Á˶Լ׹ÇÎÄ-Sun½»Ò׵ķ´¶ÔÒâ¼û£¬ÓдóÔ¼14000ÈËÔÚ¸ÃÒâ¼ûÉÏÇ©×Ö±íʾËûÃǶԴËÊÕ¹ºµÄ·´¶Ô¡£Å·ÃËίԱ»á´ËÇ°Ôø·´¶Ô¼×¹ÇÎÄÊÕ¹ºSun£¬µ«Õâһ¢¶ÏÉó²é»ú¹¹ÔÚ12ÔÂÓֳƣ¬¶Ô´Ë½»Ò×´ï³ÉÒ»¸öÂúÒâµÄ½á¹û±íʾÀÖ¹Û¡£Å·ÃËίԱ»á½«Ô ......

MySQLÊÂÎñ´¦Àí

START TRANSACTION, COMMITºÍROLLBACKÓï·¨
START TRANSACTION | BEGIN [WORK]
COMMIT [WORK] [AND [NO] CHAIN] [[NO] RELEASE]
ROLLBACK [WORK] [AND [NO] CHAIN] [[NO] RELEASE]
SET AUTOCOMMIT = {0 | 1}
START
TRANSACTION»òBEGINÓï¾ä¿ÉÒÔ¿ªÊ¼Ò»ÏîеÄÊÂÎñ¡£COMMIT¿ÉÒÔÌá½»µ±Ç°ÊÂÎñ£¬ÊDZä¸ü³ÉΪÓÀ¾Ã±ä¸ü¡£ROLLBACK ......

MysqlµÄ´æ´¢ÒýÇæ


<!--
/* Font Definitions */
@font-face
{font-family:ËÎÌå;
panose-1:2 1 6 0 3 1 1 1 1 1;
mso-font-alt:SimSun;
mso-font-charset:134;
mso-generic-font-family:auto;
mso-font-pitch:variable;
mso-font-signature:3 135135232 16 0 262145 0;}
@font-face
{font-family:"\@ËÎÌå" ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ