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MySQL rows showing problem

ftpphptest1 asked
Last Modified: 2013-12-13
$result2 = mysql_query("select * from  machine2 order by ID desc limit 2");
i can use this to get the last 2 data of ID in my table machine1

but if i change the table machine1 , delete the  ID INT NOT NULL auto_increment, then i cant use this to locate the last 2 rows of data~~~
but i still want to show the last 2 rows in php

how can i do it ?
CREATE TABLE machine1 (
 ID INT NOT NULL auto_increment,
 Date varchar(20),
 Time varchar(20) NOT NULL default '',
 GapTime varchar(100) NOT NULL default '',
 MachineNumber varchar(20) NOT NULL default '',
)type=myisam auto_increment=1;

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