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优设大课堂PostgreSQL ORDER BY 语句
PostgreSQL ORDER BY 语句
日期：2022-07-07
本文字数：260 字 阅读完需：约 2 分钟
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：
1SELECT column-list 2FROM table_name 3[WHERE condition] 4[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：
1runoobdb# select * from COMPANY; 2 id | name | age | address | salary 3----+-------+-----+-----------+-------- 4 1 | Paul | 32 | California| 20000 5 2 | Allen | 25 | Texas | 15000 6 3 | Teddy | 23 | Norway | 20000 7 4 | Mark | 25 | Rich-Mond | 65000 8 5 | David | 27 | Texas | 85000 9 6 | Kim | 22 | South-Hall| 45000 10 7 | James | 24 | Houston | 10000 11(7 rows)
下面实例将对结果根据 AGE 字段值进行升序排列：
1runoobdb=# SELECT * FROM COMPANY ORDER BY AGE ASC;
得到以下结果：
1id | name | age | address | salary 2----+-------+-----+----------------------------------------------------+-------- 3 6 | Kim | 22 | South-Hall | 45000 4 3 | Teddy | 23 | Norway | 20000 5 7 | James | 24 | Houston | 10000 6 4 | Mark | 25 | Rich-Mond | 65000 7 2 | Allen | 25 | Texas | 15000 8 5 | David | 27 | Texas | 85000 9 1 | Paul | 32 | California | 20000 10(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：
1runoobdb=# SELECT * FROM COMPANY ORDER BY NAME, SALARY ASC;
得到以下结果：
1id | name | age | address | salary 2----+-------+-----+----------------------------------------------------+-------- 3 2 | Allen | 25 | Texas | 15000 4 5 | David | 27 | Texas | 85000 5 7 | James | 24 | Houston | 10000 6 6 | Kim | 22 | South-Hall | 45000 7 4 | Mark | 25 | Rich-Mond | 65000 8 1 | Paul | 32 | California | 20000 9 3 | Teddy | 23 | Norway | 20000 10(7 rows)
下面实例将对结果根据NAME字段值进行降序排列：
1runoobdb=# SELECT * FROM COMPANY ORDER BY NAME DESC;
得到以下结果：
1id | name | age | address | salary 2----+-------+-----+----------------------------------------------------+-------- 3 3 | Teddy | 23 | Norway | 20000 4 1 | Paul | 32 | California | 20000 5 4 | Mark | 25 | Rich-Mond | 65000 6 6 | Kim | 22 | South-Hall | 45000 7 7 | James | 24 | Houston | 10000 8 5 | David | 27 | Texas | 85000 9 2 | Allen | 25 | Texas | 15000 10(7 rows)