PostgreSQL的ORDER BY子句是用来升序或降序排列，根据一个或多个列中的数据进行排序。 www.yiibai.com

语法:

ORDER BY子句的基本语法如下： www.yiibai.com

SELECT column-list
FROM table_name
[WHERE condition]
[ORDER BY column1, column2, .. columnN] [ASC | DESC]; www.yiibai.com 

可以在多列使用ORDER BY子句。确保使用的任何列进行排序，列出相应列表。 yiibai.com

实例:

考虑表公司有如下记录：

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testdb# 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)
 yiibai.com 

按年AGE升序排序结果下面是一个例子：

testdb=# SELECT * FROM COMPANY ORDER BY AGE ASC; 
yiibai.com
 

这将产生以下结果：

  id | name  | age | address    | salary
 ----+-------+-----+------------+--------
   6 | Kim   |  22 | South-Hall |  45000
   3 | Teddy |  23 | Norway     |  20000
   7 | James |  24 | Houston    |  10000
   8 | Paul  |  24 | Houston    |  20000
   4 | Mark  |  25 | Rich-Mond  |  65000
   2 | Allen |  25 | Texas      |  15000
   5 | David |  27 | Texas      |  85000
   1 | Paul  |  32 | California |  20000
   9 | James |  44 | Norway     |   5000
  10 | James |  45 | Texas      |   5000
(10 rows)
 www.yiibai.com 

下面是一个例子，这将排序结果按降序 NAME 和SALARY: www.yiibai.com

testdb=# SELECT * FROM COMPANY ORDER BY NAME, SALARY ASC; 
yiibai.com
 

这将产生以下结果： yiibai.com

 id | name  | age | address      | salary
----+-------+-----+--------------+--------
  2 | Allen |  25 | Texas        |  15000
  5 | David |  27 | Texas        |  85000
 10 | James |  45 | Texas        |   5000
  9 | James |  44 | Norway       |   5000
  7 | James |  24 | Houston      |  10000
  6 | Kim   |  22 | South-Hall   |  45000
  4 | Mark  |  25 | Rich-Mond    |  65000
  1 | Paul  |  32 | California   |  20000
  8 | Paul  |  24 | Houston      |  20000
  3 | Teddy |  23 | Norway       |  20000
(10 rows)
 
www.yiibai.com
 

以下是一个例子，它会在NAME降序排序结果：

testdb=# SELECT * FROM COMPANY ORDER BY NAME DESC; yiibai.com 

这将产生以下结果： yiibai.com

 id | name  | age | address    | salary
----+-------+-----+------------+--------
  3 | Teddy |  23 | Norway     |  20000
  1 | Paul  |  32 | California |  20000
  8 | Paul  |  24 | Houston    |  20000
  4 | Mark  |  25 | Rich-Mond  |  65000
  6 | Kim   |  22 | South-Hall |  45000
  7 | James |  24 | Houston    |  10000
  9 | James |  44 | Norway     |   5000
 10 | James |  45 | Texas      |   5000
  5 | David |  27 | Texas      |  85000
  2 | Allen |  25 | Texas      |  15000
(10 rows) yiibai.com