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Python开发从零开始-49.11-数据库操作

  • 2026-08-18 23:11:10
Python开发从零开始-49.11-数据库操作

接上文Python开发从零开始-49.10-数据库操作本文小编与大家分享 Python 数据库操作的相关知识。

(20)数据排序

ORDER BY 子句可以用来基于一个或多个字段按升序或降序顺序排列数据。ORDER BY 子句的基本语法如下:

SELECT column-list 

FROM table_name 

[WHERE condition] 

[ORDER BY 

    column1[ASCDESC]

    [, column2[ASCDESC]

    ,,, columnN[ASCDESC]];

语法解释:

  • column-list:查询字段列表;

  • table_name:查询表名;

  • [WHERE condition]:可选查询条件;

  • [ORDER BY column1[ASC | DESC] [, column2[ASC | DESC] ,,, columnN[ASC | DESC]]可选排序语句。其中 column1[, column2,,, columnN] 为排序字段列表; [ASC | DESC] 为可选排序选项,ASC 是升序,DESC 是降序,默认为 ASC。

ORDER BY 子句的使用实例演示如下:

1)查询 COMPANY 表,结果以 SALARY 升序排序,可不显式使用 ASC(升序),因为默认为 ASC。

2)查询 COMPANY 表,结果以 NAME 降序排序。

3)查询 COMPANY 表,结果以 NAME 和 SALARY 升序排序。

【小编提示】

当使用多个字段进行排序时,SQLite 首先按照第一个指定的字段进行排序。如果第一个字段的值相同,那么它会根据第二个字段进行排序,以此类推。

(21)数据分组

GROUP BY 子句与 SELECT 语句一起使用,用于对相同的数据进行分组。在 SELECT 语句中,GROUP BY 子句放在 WHERE 子句之后,放在 ORDER BY 子句之前GROUP BY 子句的基本语法如下:

SELECT column-list

FROM table_name

[WHERE conditions]

GROUP BY column1[, column2,,, columnN]

[ORDER BYstatements]

语法解释:

  • column-list:查询字段列表;

  • table_name:查询表名;

  • [WHERE conditions]:可选的条件语句;

  • column1[, column2,,, columnN]一个或多个分组字段,确保分组字段在 column-list 中;

  • [ORDER BY statements]:可选的排序语句。

GROUP BY 子句使用实例演示如下:

1)查询 COMPANY 表,结果以 SALARY 分组。

SALARY 字段中有一个重复值 20000,所以返回的查询结果只有 6 条。

2)查询 COMPANY 表,结果以 SALARY 和 NAME 分组,并按照 ADDRESS 字段降序排列。

【小编提示】

GROUP BY 语句通常与聚合函数(如COUNT()、SUM()、AVG()、 MAX()、MIN()等)一起使用,以便对每个分组执行计算。关于聚合函数后续章节会进行介绍

(22)分组结果过滤

HAVING 子句用于在分组后对结果进行过滤。它与 WHERE 子句的区别在于:WHERE 子句用于过滤行(分组前),HAVING 子句用于过滤组(分组后)‌。HAVING 子句通常与聚合函数一起使用。‌‌

HAVING 子句必须放在 GROUP BY 子句之后,ORDER BY 子句之前,其在 SELECT 语句中基本语法如下:

SELECT column-list

FROM table_name

[WHERE conditions]

GROUP BY column1[, column2,,, columnN]

HAVING conditions 

[ORDER BY statements]

语法解释:

  • column-list:查询字段列表;

  • table_name:查询表名;

  • [WHERE conditions]:可选的 WHERE 条件语句;

  • GROUP BY column1[, column2,,, columnN]:一个或多个字段分组,确保分组字段在 column-list 中

  • HAVING conditions:HAVING 条件语句;

  • [ORDER BY statements]:可选的排序语句。

HAVING 子句使用实例演示如下:

1)为方便演示,先向 COMPANY 表插入几条重复数据。

INSERT INTO COMPANY VALUES (8, 'Paul', 24, 'Houston', 20000.00 );INSERT INTO COMPANY VALUES (9, 'James', 44, 'Norway', 5000.00 );INSERT INTO COMPANY VALUES (10, 'James', 45, 'Texas', 5000.00 );

此时 COMPANY 表记录如下

ID          NAME        AGE         ADDRESS     SALARY----------  ----------  ----------  ----------  ----------1           Paul        32          California  20000.02           Allen       25          Texas       15000.03           Teddy       23          Norway      20000.04           Mark        25          Rich-Mond   65000.05           David       27          Texas       85000.06           Kim         22          South-Hall  45000.07           James       24          Houston     10000.08           Paul        24          Houston     20000.09           James       44          Norway      5000.010          James       45          Texas       5000.0

2)查询 COMPANY 表,对 NAME 分组,筛选同名计数小于 2 的记录。COUNT()‌ 函数用于计算行数,语法为 COUNT(column_name) 或 COUNT(*)

3)查询 COMPANY 表,对 NAME 分组,筛选同名计数大于 2 的记录。

(23)清除重复记录

DISTINCT 关键字与 SELECT 语句一起使用,来消除所有重复的记录,并只获取唯一一次记录。

DISTINCT 关键字的基本语法

SELECT DISTINCT  column-list

FROM table_name

  • column-list:查询字段列表;

  • table_name:查询表名。

DISTINCT 关键字使用示例如下:

使用已有重复记录的 COMPANY 表,查询 NAME 的值不重复的记录。

受文章篇幅所限,下文将继续介绍 Python 数据库操作的相关知识。

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  1. CONNECT:[ UseTime:0.000810s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001260s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.035365s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.023900s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001602s ]
  6. SELECT * FROM `set` [ RunTime:0.001595s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001304s ]
  8. SELECT * FROM `article` WHERE `id` = 506154 LIMIT 1 [ RunTime:0.003935s ]
  9. UPDATE `article` SET `lasttime` = 1787328240 WHERE `id` = 506154 [ RunTime:0.027060s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.020832s ]
  11. SELECT * FROM `article` WHERE `id` < 506154 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.005888s ]
  12. SELECT * FROM `article` WHERE `id` > 506154 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.006867s ]
  13. SELECT * FROM `article` WHERE `id` < 506154 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.016709s ]
  14. SELECT * FROM `article` WHERE `id` < 506154 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.117705s ]
  15. SELECT * FROM `article` WHERE `id` < 506154 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002080s ]
0.412870s