如何获取MySQL的最后一行值？

Question

我有一张桌子Live,我在桌子上public_id.在public_id数字中(例如1,2,3,4,5).我如何获得最高数字或最后一个条目的数字？

Answer 1

我会选择

SELECT public_id FROM Live ORDER BY public_id DESC LIMIT 1;

它已经发布,但我会添加更多内容:

如果通常执行此查询,则可以创建具有反向排序的索引.

就像是:

CREATE INDEX ON Live (public_id DESC) 

请注意

DESC

PHP + MySQL代码:

<?php
$result = mysql_query('SELECT public_id FROM Live ORDER BY public_id DESC LIMIT 1;');
if (mysql_num_rows($result) > 0) {
   $max_public_id = mysql_fetch_row($result);
   echo $max_public_id[0]; //Here it is
}
?>

Answer 2

SELECT public_id FROM Live ORDER BY public_id DESC LIMIT 1;

会给你最高的数字

编辑:对于PHP

$conn = mysql_connect(....
$query = "SELECT public_id FROM Live ORDER BY public_id DESC LIMIT 1";
$result = mysql_query($query, $conn);