在线等：怎样读出数据库里面一个字段的最后一个值？

该值名id，自动递增的。用什么sql语句可以直接读出最后的id的数字？
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1   
2mysql_connect("localhost", "mysql_user", "mysql_password") or   
3die("Could not connect: " . mysql_error());   
4mysql_select_db("mydb");   
5  
6mysql_query("INSERT INTO mytable (product) values ('kossu')");   
7printf ("Last inserted record has id %d\n", mysql_insert_id());

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$sql="select * from myTable order by id desc limit 0,1"; //得到最后一個 id 的數據
$result=mysql_query($sql);
$row=mysql_fetch_array($sql);

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$sql="select id from myTable order by id desc limit 1";
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select max(id) from arinvoice;
最直接的方法。
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select max(id) from 表名
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last_insert_id()
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$sql="select max(id) from myTable "