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「SQLite学习笔记」Order By

2014-12-30  本文已影响66人  元茜姑娘

SQLite 的 ORDER BY 子句是用来基于一个或多个列按升序或降序顺序排列数据。

语法

ORDER BY 子句的基本语法如下:

SELECT column-list

FROM table_name

[WHERE condition]

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

您可以在 ORDER BY 子句中使用多个列。确保您使用的排序列在列清单中。

实例

假设 COMPANY 表有以下记录:

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

下面是一个实例,它会将结果按 SALARY 降序排序:

sqlite> SELECT * FROM COMPANY ORDER BY SALARY ASC;

这将产生以下结果:

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

下面是一个实例,它会将结果按 NAME 和 SALARY 降序排序:

sqlite> SELECT * FROM COMPANY ORDER BY NAME, SALARY ASC;

这将产生以下结果:

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

下面是一个实例,它会将结果按 NAME 降序排序:

sqlite> SELECT * FROM COMPANY ORDER BY NAME DESC;

这将产生以下结果:

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

参考:http://www.w3cschool.cc/sqlite/sqlite-order-by.html

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