最近几年来，地理信息系统无论是在理论上还是应用上都处在一个飞速发展的阶段。 GIS被应用于多个领域的建模和决策支持，如城市管理、区划、环境整治等等，地理信息成为信息时代重要的组成部分之一； “数字地球”概念的提出，更进一步推动了作为其技术支撑的GIS的发展。 与此同时，一些学者致力于相关的理论研究，如空间感知、空间数据误差、空间关系的形式化等等。 这恰好说明了地理信息系统作为应用技术和学科的两个方面，并且这两个方面构成了相互促进的发展过程。
SQLite’s ORDER BY Clause is used to sort data in ascending or descending order based on one or more columns. You can find it in the Hypothetical Here is an example that presses the result This will produce the following results: Here is an example that presses the result This will produce the following results: Here is an example that presses the result This will produce the following results: 1.23.1. Grammar ¶
ORDER BY The basic syntax of the clause is as follows:SELECT column-list FROM table_name [WHERE condition] [ORDER BY column1, column2, .. columnN] [ASC | DESC];
ORDER BY Multiple columns are used in the clause. Make sure that the sort you use is listed in the list. 1.23.2. Example ¶
COMPANY The table has the following records: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
SALARY Sort in ascending order:sqlite> SELECT * FROM COMPANY ORDER BY SALARY ASC;
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
NAME And SALARY Sort in ascending order:sqlite> SELECT * FROM COMPANY ORDER BY NAME, SALARY ASC;
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
NAME Sort in descending order:sqlite> SELECT * FROM COMPANY ORDER BY NAME DESC;
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