使用ORDER BY ID DESC何

Question

如何使用正確的代碼使用ORDER BY id DESC and WHERE

$sel = "SELECT * FROM items where portfolio_id=".$_GET['folio_id']."ORDER BY id DESC"; 

Answer 1

這裏添加一個空格，如圖所示。

$sel = "SELECT * FROM items where portfolio_id=".$_GET['folio_id']." ORDER BY id DESC"; 
                   ----^ 

另外，不要將您的參數，如$_GET或$_POST直接進入SQL查詢，因爲它肯定會導致SQL注入攻擊。過濾這些參數或使用Prepared Statements。

Answer 2

之前 'ORDER' 添加一個空格至少

$sel = "SELECT * FROM items where portfolio_id=".$_GET['folio_id']." ORDER BY id DESC"; 

Answer 3

您需要ORDER BY

$sel = "SELECT * FROM items where portfolio_id=".$_GET['folio_id']." ORDER BY id DESC"; 

Answer 4

提供空間，只要使用此：

$sel = "SELECT * FROM items where portfolio_id ='$_GET[folio_id]' ORDER BY id DESC";