將查詢限制爲查詢的5個最低值到變量的5個最低值

Question

我想將以下查詢限制爲5個結果。但不僅僅是5個結果。 points的5個最低值。我怎樣才能做到這一點？

$side = "SELECT title, points, submissionid 
      FROM submission 
      WHERE points >= '$sidepoints' 
     ORDER BY points DESC"; 

編輯：我想points降序排列的結果。

Answer 1

嘗試用另一個查詢（子查詢）訂購您的查詢結果

SELECT * FROM (
    SELECT title, points, submissionid 
    FROM submission 
    WHERE points >= '$sidepoints' 
    ORDER BY points ASC 
    LIMIT 5 
) t ORDER BY t.points DESC 

Answer 2

如果您使用MYSQL則使用LIMIT。

$side = "SELECT title, points, submissionid 
     FROM submission 
     WHERE points >= '$sidepoints' 
     ORDER BY points DESC 
     LIMIT 5"; 

ansi sql使用TOP。這將用於SQL Server

$side = "SELECT TOP 5 title, points, submissionid 
      FROM submission 
      WHERE points >= '$sidepoints' 
      ORDER BY points DESC"; 

Answer 3

工作在MySQL：

$side = "SELECT title, points, submissionid 
     FROM submission 
     WHERE points >= '$sidepoints' 
     ORDER BY points ASC 
     LIMIT 5"; 

編輯

您可以使用下面的PHP代碼上面的查詢，或者使用不同的SQL查詢。

PHP反向結果（未經測試）

$q = mysql_query($side); 
$results = array(); 
while($r = mysql_fetch_assoc($q)) 
{ 
    $results[] = $r; 
} 
$results = array_reverse($results); 
foreach($results as $result) 
{ 
    echo $result['points']; // etc 
} 

或SQL的方式（未經測試，以及 - 從this post中）

SELECT title, points, submissionid 
FROM (
    SELECT title, points, submissionid 
     FROM submission 
     WHERE points >= '$sidepoints' 
     ORDER BY points ASC 
     LIMIT 5 
) AS t1 ORDER BY points DESC 

Answer 4

SELECT ... ORDER BY點ASC LIMIT 5？