PostgreSQL ORDER BY 语句

在 PostgreSQL 中， ORDER BY 用于对一列或者多列数据进行升序（ASC）或者降序（DESC）排列。

语法

ORDER BY 子句的基础语法如下：

SELECT column-list

FROM table_name

[WHERE condition]

[ORDER BY column1, column2, .. columnN] [ASC | DESC];

您可以在 ORDER BY 中使用一列或者多列，但是必须保证要排序的列必须存在。

ASC 表示升序， DESC 表示降序。

实例

创建 COMPANY 表（下载 COMPANY SQL 文件），数据内容如下：

ez4codedb# select * from COMPANY;

 id | name  | age | address   | salary

----+-------+-----+-----------+--------

  1 | Paul  |  32 | California|  20000

  2 | Allen |  25 | Texas     |  15000

  3 | Teddy |  23 | Norway    |  20000

  4 | Mark  |  25 | Rich-Mond |  65000

  5 | David |  27 | Texas     |  85000

  6 | Kim   |  22 | South-Hall|  45000

  7 | James |  24 | Houston   |  10000

(7 rows)

下面实例将对结果根据 AGE 字段值进行升序排列：

ez4codedb=# SELECT * FROM COMPANY ORDER BY AGE ASC;

得到以下结果：


 id | name  | age |                      address                       | salary 

----+-------+-----+----------------------------------------------------+--------

  6 | Kim   |  22 | South-Hall                                         |  45000

  3 | Teddy |  23 | Norway                                             |  20000

  7 | James |  24 | Houston                                            |  10000

  4 | Mark  |  25 | Rich-Mond                                          |  65000

  2 | Allen |  25 | Texas                                              |  15000

  5 | David |  27 | Texas                                              |  85000

  1 | Paul  |  32 | California                                         |  20000

(7 rows)

下面实例将对结果根据 NAME 字段值和 SALARY 字段值进行升序排序：

ez4codedb=# SELECT * FROM COMPANY ORDER BY NAME, SALARY ASC;

得到以下结果：

 id | name  | age |                      address                       | salary 

----+-------+-----+----------------------------------------------------+--------

  2 | Allen |  25 | Texas                                              |  15000

  5 | David |  27 | Texas                                              |  85000

  7 | James |  24 | Houston                                            |  10000

  6 | Kim   |  22 | South-Hall                                         |  45000

  4 | Mark  |  25 | Rich-Mond                                          |  65000

  1 | Paul  |  32 | California                                         |  20000

  3 | Teddy |  23 | Norway                                             |  20000

(7 rows)

下面实例将对结果根据NAME字段值进行降序排列：

ez4codedb=# SELECT * FROM COMPANY ORDER BY NAME DESC;

得到以下结果：

 id | name  | age |                      address                       | salary 

----+-------+-----+----------------------------------------------------+--------

  3 | Teddy |  23 | Norway                                             |  20000

  1 | Paul  |  32 | California                                         |  20000

  4 | Mark  |  25 | Rich-Mond                                          |  65000

  6 | Kim   |  22 | South-Hall                                         |  45000

  7 | James |  24 | Houston                                            |  10000

  5 | David |  27 | Texas                                              |  85000

  2 | Allen |  25 | Texas                                              |  15000

(7 rows)

PostgreSQL ORDER BY - POSTGRESQL教程

PostgreSQL ORDER BY 语句

语法

实例