mysql order by 对select查询结果集排序

mysql order by 语法：

<code class="language-sql">SELECT field1, field2,...fieldN table_name1, table_name2...
ORDER BY field1, [field2...] [ASC [DESC]]</code>

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：

<code class="language-sql">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),
    ->     description   VARCHAR(15)
    -> );
Query OK, 0 rows affected (0.03 sec)</code>

向表中插入若干数据：

<code class="language-sql">mysql> insert into Employee(id,first_name, last_name, start_date, end_Date,salary,City,      Description)
    ->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,       Description)
    ->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,       Description)
    ->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,       Description)
    ->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,       Description)
    ->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,       Description)
    ->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,       Description)
    ->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,       Description)
    ->values(8,'James',    'Cat',     '19960917',  '20020415', 1232.78,'Vancouver', 'Tester');
Query OK, 1 row affected (0.02 sec)</code>

查询数据并对结果集排序：

<code class="language-sql">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)</code>