简单了解标准SQL的update语句三种用法

一、环境: MySQL-5.0.41-win32 Windows XP professional 二、建立测试环境: DROP TABLE IF EXISTS t_test; CREATE TABLE t_test ( bs bigint(20) NOT NULL auto_increment, username varchar(20) NOT NULL, password varchar(20) default NULL, remark varchar(200) default NULL, PRIMARY KEY (bs) ) ENGINE=MyISAM AUTO_INCREMEN