PHP MySQL Order By

ORDER BY 关键词用于对记录集中的数据进行排序。

ORDER BY 关键词

ORDER BY 关键词用于对记录集中的数据进行排序。

ORDER BY 关键词默认对记录进行升序排序。

如果你想降序排序,请使用 DESC 关键字。

语法

SELECT column_name(s)
FROM table_name
ORDER BY column_name(s) ASC|DESC

实例

下面的实例选取 "Persons" 表中存储的所有数据,并根据 "Age" 列对结果进行排序:

<?php
$con=mysqli_connect("example.com","peter","abc123","my_db");
// Check connection
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}

$result = mysqli_query($con,"SELECT * FROM Persons ORDER BY age");

while($row = mysqli_fetch_array($result))
{
echo $row['FirstName'];
echo " " . $row['LastName'];
echo " " . $row['Age'];
echo "<br>";
}

mysqli_close($con);
?>

以上结果将输出:

Glenn Quagmire 33
Peter Griffin 35

 

根据两列进行排序

可以根据多个列进行排序。当按照多个列进行排序时,只有第一列的值相同时才使用第二列:

SELECT column_name(s)
FROM table_name
ORDER BY column1, column2