mysql order by 对select查询结果集排序

mysql order by 语法：

SELECT field1, field2,...fieldN table_name1, table_name2...
ORDER BY field1, [field2...] [ASC [DESC]]

说明： 

• 你可以使用任何字段来作为排序的条件，从而返回排序后的查询结果。
• 你可以设定多个字段来排序。
• 你可以使用 ASC 或 DESC 关键字来设置查询结果是按升序或降序排列。 默认情况下，它是按升排列。
• 你可以添加 WHERE...LIKE 子句来设置条件。

mysql order by实例

首先创建一张表：

mysql> CREATE TABLE Employee(
    ->     id            int,
    ->     first_name    VARCHAR(15),
    ->     last_name     VARCHAR(15),
    ->     start_date    DATE,
    ->     end_date      DATE,
    ->     salary        FLOAT(8,2),
    ->     city          VARCHAR(10),
    ->     de ion   VARCHAR(15)
    -> );
Query OK, 0 rows affected (0.03 sec)

向表中插入若干数据：

mysql> insert into Employee(id,first_name, last_name, start_date, end_Date,salary,City,      De ion)
    ->values (1,\'Jason\',    \'Martin\',  \'19960725\',  \'20060725\', 1234.56, \'Toronto\',  \'Programmer\');
Query OK, 1 row affected (0.02 sec)

mysql>
mysql> insert into Employee(id,first_name, last_name, start_date, end_Date,salary,City,       De ion)
    ->values(2,\'Alison\',   \'Mathews\',  \'19760321\', \'19860221\', 6661.78, \'Vancouver\',\'Tester\');
Query OK, 1 row affected (0.00 sec)

mysql>
mysql> insert into Employee(id,first_name, last_name, start_date, end_Date,salary,City,       De ion)
    ->values(3,\'James\',    \'Smith\',    \'19781212\', \'19900315\', 6544.78, \'Vancouver\',\'Tester\');
Query OK, 1 row affected (0.00 sec)

mysql>
mysql> insert into Employee(id,first_name, last_name, start_date, end_Date,salary,City,       De ion)
    ->values(4,\'Celia\',    \'Rice\',     \'19821024\', \'19990421\', 2344.78, \'Vancouver\',\'Manager\');
Query OK, 1 row affected (0.00 sec)

mysql>
mysql> insert into Employee(id,first_name, last_name, start_date, end_Date,salary,City,       De ion)
    ->values(5,\'Robert\',   \'Black\',    \'19840115\', \'19980808\', 2334.78, \'Vancouver\',\'Tester\');
Query OK, 1 row affected (0.00 sec)

mysql>
mysql> insert into Employee(id,first_name, last_name, start_date, end_Date,salary,City,       De ion)
    ->values(6,\'Linda\',    \'Green\',    \'19870730\', \'19960104\', 4322.78,\'New York\',  \'Tester\');
Query OK, 1 row affected (0.00 sec)

mysql>
mysql> insert into Employee(id,first_name, last_name, start_date, end_Date,salary,City,       De ion)
    ->values(7,\'David\',    \'Larry\',    \'19901231\', \'19980212\', 7897.78,\'New York\',\'Manager\');
Query OK, 1 row affected (0.00 sec)

mysql>
mysql> insert into Employee(id,first_name, last_name, start_date, end_Date,salary,City,       De ion)
    ->values(8,\'James\',    \'Cat\',     \'19960917\',  \'20020415\', 1232.78,\'Vancouver\', \'Tester\');
Query OK, 1 row affected (0.02 sec)

查询数据并对结果集排序：

mysql> SELECT first_name, start_date FROM employee ORDER BY start_date;
+------------+------------+
| first_name | start_date |
+------------+------------+
| Alison     | 1976-03-21 |
| James      | 1978-12-12 |
| Celia      | 1982-10-24 |
| Robert     | 1984-01-15 |
| Linda      | 1987-07-30 |
| David      | 1990-12-31 |
| Jason      | 1996-07-25 |
| James      | 1996-09-17 |
+------------+------------+
8 rows in set (0.02 sec)