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create table tb_User(Id int auto_increment
not null primary key,UserName varchar(50),Password varchar(20));
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desc tb_User;
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ÖØÃüÃû±í£ºalter table tb_User rename
tb_UserInfo;
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(Date datetime);
ɾ³ýÒ»ÁУºalter table tb_User drop
column Date;
ÐÞ¸ÄÒ»ÁÐÊôÐÔ£ºalter table tb_User change
UserName UserName varchar(50) not null;£¨Óô˷½·¨¿ÉÒÔÖØÃüÃûÒ»ÁУ©
Ìí¼ÓÖ÷¼ü£ºalter table tb_User add primary key(Ö÷¼ü×Ö¶Î);
Ìí¼ÓË÷Òý£ºalter table tb-User add index(×Ö¶ÎÃû);
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insert into tb_User(UserName ,Password,Date) vlaues('cmj','123',Now());
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