时间:2021-07-01 10:21:17 帮助过:4人阅读
SELECT field1, field2,...fieldN table_name1, table_name2... ORDER BY field1, [field2...] [ASC [DESC]]
这里是通用的SQL的SELECT命令的语法,ORDER BY子句从MySQL表中的数据进行排序:
在命令提示符下使用ORDER BY子句:
这将使用SQL SELECT命令来从MySQL表tutorials_tbl表中获取数据ORDER BY子句
实例:
试试下面的示例升序返回结果。
root@host# mysql -u root -p password; Enter password:******* mysql> use TUTORIALS; Database changed mysql> SELECT * from tutorials_tbl ORDER BY tutorial_author ASC +-------------+----------------+-----------------+-----------------+ | tutorial_id | tutorial_title | tutorial_author | submission_date | +-------------+----------------+-----------------+-----------------+ | 2 | Learn MySQL | Abdul S | 2007-05-24 | | 1 | Learn PHP | John Poul | 2007-05-24 | | 3 | JAVA Tutorial | Sanjay | 2007-05-06 | +-------------+----------------+-----------------+-----------------+ 3 rows in set (0.42 sec) mysql>
所有作者的名字列按升序排列。
PHP脚本使用ORDER BY子句:
可以使用类似的语法的ORDER BY子句到PHP函数mysql_query()。这个函数是用来执行SQL命令后,另一个PHP函数mysql_fetch_array()可以用来获取所有选定的数据。
例子:
试试下面的示例教程作者降序返回结果。
<?php $dbhost = 'localhost:3036'; $dbuser = 'root'; $dbpass = 'rootpassword'; $conn = mysql_connect($dbhost, $dbuser, $dbpass); if(! $conn ) { die('Could not connect: ' . mysql_error()); } $sql = 'SELECT tutorial_id, tutorial_title, tutorial_author, submission_date FROM tutorials_tbl ORDER BY tutorial_author DESC'; mysql_select_db('TUTORIALS'); $retval = mysql_query( $sql, $conn ); if(! $retval ) { die('Could not get data: ' . mysql_error()); } while($row = mysql_fetch_array($retval, MYSQL_ASSOC)) { echo "Tutorial ID :{$row['tutorial_id']}
". "Title: {$row['tutorial_title']}
". "Author: {$row['tutorial_author']}
". "Submission Date : {$row['submission_date']}
". "--------------------------------
"; } echo "Fetched data successfully\n"; mysql_close($conn); ?>