mysql 创建表并设置主键自增

mysql?创建表：?????mysql>?create?table?user(??????->?userid?int(4)?primary?key?not?null?auto_increment,??????->?username?varchar(16)?not?null,??????->?userpassword?varchar(32)?not?null??????->?);???????????create?table?log(??logid?int(4)?primary?key?not?null?auto_increment,??logtitle?varchar(32)?not?null,??logcontent?varchar(160)?not?null,??logtime?datetime?not?null,??userip?varchar(64)?not?null??);?