php - Order by 和 LIMIT 在 MySQL Query 中都不能一起工作

Question

我正在尝试通过 Desending 订购并希望在 Query 中限制 30

PHP代码

$page = $_POST['page'];
$cur_page = $page;
$page -= 1;
$per_page = 30;
$previous_btn = true;
$next_btn = true;
$first_btn = true;
$last_btn = true;
$start = $page * $per_page;

$query_pag_data = "SELECT * from titles LIMIT $start, $per_page ORDER BY id DESC";

错误 ：MySql ErrorYou have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'ORDER BY id DESC' at line 1

PS：我正在使用分页......所以限制了 30 个这样的结果

Answer 1

正确的语法是：

SELECT * from titles 
ORDER BY id DESC
LIMIT $start, $per_page 

LIMIT 在查询的末尾。

Answer 2

改变位置或LIMIT和ORDER BY，如：

$query_pag_data = "SELECT * from titles ORDER BY id DESC LIMIT $start, $per_page";

Answer 3

您需要在 LIMIT 之前先放置 ORDER BY 语句

正确的语法如下：

SELECT * FROM *table_name* WHERE *condition* ORBER BY *field_name* LIMIT *limit*;

Answer 4

LIMIT 语句应始终出现在查询的末尾。

Answer 5

您必须将限制放在查询的末尾以获得正确的语法：

$query_pag_data = "SELECT * from titles ORDER BY id DESC  LIMIT $start, $per_page";