sqlite order by

sqlite 的 order by 子句是用來(lái)基于一個(gè)或多個(gè)列按升序或降序順序排列數(shù)據(jù)。

1. 語(yǔ)法

order by 子句的基本語(yǔ)法如下：

select column-list 
from table_name 
[where condition] 
[order by column1, column2, .. columnn] [asc | desc];

您可以在 order by 子句中使用多個(gè)列。確保您使用的排序列在列清單中。

2. 范例

假設(shè) company 表有以下記錄：

id          name        age         address     salary
----------  ----------  ----------  ----------  ----------
1           paul        32          california  20000.0
2           allen       25          texas       15000.0
3           teddy       23          norway      20000.0
4           mark        25          rich-mond   65000.0
5           david       27          texas       85000.0
6           kim         22          south-hall  45000.0
7           james       24          houston     10000.0

下面是一個(gè)范例，它會(huì)將結(jié)果按 salary 升序排序：

sqlite> select * from company order by salary asc;

這將產(chǎn)生以下結(jié)果：

id          name        age         address     salary
----------  ----------  ----------  ----------  ----------
7           james       24          houston     10000.0
2           allen       25          texas       15000.0
1           paul        32          california  20000.0
3           teddy       23          norway      20000.0
6           kim         22          south-hall  45000.0
4           mark        25          rich-mond   65000.0
5           david       27          texas       85000.0

下面是一個(gè)范例，它會(huì)將結(jié)果按 name 和 salary 升序排序：

sqlite> select * from company order by name, salary asc;

這將產(chǎn)生以下結(jié)果：

id          name        age         address     salary
----------  ----------  ----------  ----------  ----------
2           allen       25          texas       15000.0
5           david       27          texas       85000.0
7           james       24          houston     10000.0
6           kim         22          south-hall  45000.0
4           mark        25          rich-mond   65000.0
1           paul        32          california  20000.0
3           teddy       23          norway      20000.0

下面是一個(gè)范例，它會(huì)將結(jié)果按 name 降序排序：

sqlite> select * from company order by name desc;

這將產(chǎn)生以下結(jié)果：

id          name        age         address     salary
----------  ----------  ----------  ----------  ----------
3           teddy       23          norway      20000.0
1           paul        32          california  20000.0
4           mark        25          rich-mond   65000.0
6           kim         22          south-hall  45000.0
7           james       24          houston     10000.0
5           david       27          texas       85000.0
2           allen       25          texas       15000.0