القسم php - الزيارات 1669 - التاريخ 20/3/2008
The ORDER BY keyword is used to sort the data in a recordset. -------------------------------------------------------------------------------- [color=FA0309]The ORDER BY Keyword[/color]
The ORDER BY keyword is used to sort the data in a recordset. [color=FA0309]Syntax[/color]
SELECT column_name(s)
FROM table_name
ORDER BY column_name
Note: SQL statements are not case sensitive. ORDER BY is the same as order by. [color=FA0309]Example[/color]
The following example selects all the data stored in the 'Person' table, and sorts the result by the 'Age' column:
<?php
$con = mysql_connect('localhost','peter','abc123');
if (!$con)
{
die('Could not connect: ' . mysql_error());
} mysql_select_db('my_db', $con); $result = mysql_query('SELECT * FROM person ORDER BY age'); while($row = mysql_fetch_array($result))
{
echo $row['FirstName'];
echo ' ' . $row['LastName'];
echo ' ' . $row['Age'];
echo '<br />';
}mysql_close($con);
?>
The output of the code above will be:
Glenn Quagmire 33
Peter Griffin 35
-------------------------------------------------------------------------------- [color=FA0309]Sort Ascending or Descending[/color]
If you use the ORDER BY keyword, the sort-order of the recordset is ascending by default (1 before 9 and 'a' before 'p'). Use the DESC keyword to specify a descending sort-order (9 before 1 and 'p' before 'a'):
SELECT column_name(s)
FROM table_name
ORDER BY column_name DESC
-------------------------------------------------------------------------------- [color=FA0309]Order by Two Columns[/color]
It is possible to order by more than one column. When ordering by more than one column, the second column is only used if the values in the first column are identical:
SELECT column_name(s)
FROM table_name
ORDER BY column_name1, column_name2
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