「SQLite学习笔记」Order By

作者: 元茜姑娘 | 来源:发表于2014-12-30 14:02 被阅读66次

    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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