未加星标

mysql 行列动态转换的实现(列联表,交叉表)

字体大小 | |
[数据库(mysql) 所属分类 数据库(mysql) | 发布者 店小二05 | 时间 | 作者 红领巾 ] 0人收藏点击收藏

(1)动态,适用于列不确定情况

create table table_name(
id int primary key,
col1 char(2),
col2 char(2),
col3 int
);
insert into table_name values
(1 ,'A1','B1',9),
(2 ,'A2','B1',7),
(3 ,'A3','B1',4),
(4 ,'A4','B1',2),
(5 ,'A1','B2',2),
(6 ,'A2','B2',9),
(7 ,'A3','B2',8),
(8 ,'A4','B2',5),
(9 ,'A1','B3',1),
(10 ,'A2','B3',8),
(11 ,'A3','B3',8),
(12 ,'A4','B3',6),
(13 ,'A1','B4',8),
(14 ,'A2','B4',2),
(15 ,'A3','B4',6),
(16 ,'A4','B4',9),
(17 ,'A1','B4',3),
(18 ,'A2','B4',5),
(19 ,'A3','B4',2),
(20 ,'A4','B4',5);
select * from table_name;
+----+------+------+------+
| id | col1 | col2 | col3 |
+----+------+------+------+
| 1 | A1 | B1 | 9 |
| 2 | A2 | B1 | 7 |
| 3 | A3 | B1 | 4 |
| 4 | A4 | B1 | 2 |
| 5 | A1 | B2 | 2 |
| 6 | A2 | B2 | 9 |
| 7 | A3 | B2 | 8 |
| 8 | A4 | B2 | 5 |
| 9 | A1 | B3 | 1 |
| 10 | A2 | B3 | 8 |
| 11 | A3 | B3 | 8 |
| 12 | A4 | B3 | 6 |
| 13 | A1 | B4 | 8 |
| 14 | A2 | B4 | 2 |
| 15 | A3 | B4 | 6 |
| 16 | A4 | B4 | 9 |
| 17 | A1 | B4 | 3 |
| 18 | A2 | B4 | 5 |
| 19 | A3 | B4 | 2 |
| 20 | A4 | B4 | 5 |
+----+------+------+------+

SET @EE='';
SELECT @EE:=CONCAT(@EE,'SUM(IF(col2=\'',col2,'\'',',col3,0)) AS ',col2,',') FROM (SELECT DISTINCT col2 FROM table_name) A;
SET @QQ=CONCAT('SELECT ifnull(col1,\'total\') AS columnA,',LEFT(@EE,LENGTH(@EE)-1),' ,SUM(col3) AS TOTAL FROM table_name GROUP BY col1 WITH ROLLUP');
PREPARE stmt2 FROM @QQ;
EXECUTE stmt2;

+---------+------+------+------+------+-------+
| columnA | B1 | B2 | B3 | B4 | TOTAL |
+---------+------+------+------+------+-------+
| A1 | 9 | 2 | 1 | 11 | 23 |
| A2 | 7 | 9 | 8 | 7 | 31 |
| A3 | 4 | 8 | 8 | 8 | 28 |
| A4 | 2 | 5 | 6 | 14 | 27 |
| total | 22 | 24 | 23 | 40 | 109 |
+---------+------+------+------+------+-------+

(2)第二个字段确定的情况下使用

SELECT
IFNULL(col1,'total') AS total,
SUM(IF(col2='B1',col3,0)) AS B1,
SUM(IF(col2='B2',col3,0)) AS B2,
SUM(IF(col2='B3',col3,0)) AS B3,
SUM(IF(col2='B4',col3,0)) AS B4,
SUM(IF(col2='total',col3,0)) AS total
FROM (
SELECT col1,IFNULL(col2,'total') AS col2,SUM(col3) AS col3
FROM table_name
GROUP BY col1,col2
WITH ROLLUP
HAVING col1 IS NOT NULL
) AS A
GROUP BY col1
WITH ROLLUP;

注: WITH ROLLUP 用于列上求和; SUM(IF(col2='total',col3,0)) AS total 用于行上求和。

(3)第二个字段确定的情况下使用

select ifnull(col1,'total') AS col1,
sum(if(col2='B1',col3,0)) AS B1,
sum(if(col2='B2',col3,0)) AS B2,
sum(if(col2='B3',col3,0)) AS B3,
sum(if(col2='B4',col3,0)) AS B4,SUM(col3) AS TOTAL
from table_name
group by col1 with rollup ;

以上这篇mysql 行列动态转换的实现(列联表,交叉表)就是小编分享给大家的全部内容了,希望能给大家一个参考,也希望大家多多支持脚本之家。

本文数据库(mysql)相关术语:navicat for mysql mysql workbench mysql数据库 mysql 存储过程 mysql安装图解 mysql教程 mysql 管理工具

主题: SUUTCUTIEPA
分页:12
转载请注明
本文标题:mysql 行列动态转换的实现(列联表,交叉表)
本站链接:http://www.codesec.net/view/523516.html
分享请点击:


1.凡CodeSecTeam转载的文章,均出自其它媒体或其他官网介绍,目的在于传递更多的信息,并不代表本站赞同其观点和其真实性负责;
2.转载的文章仅代表原创作者观点,与本站无关。其原创性以及文中陈述文字和内容未经本站证实,本站对该文以及其中全部或者部分内容、文字的真实性、完整性、及时性,不作出任何保证或承若;
3.如本站转载稿涉及版权等问题,请作者及时联系本站,我们会及时处理。
登录后可拥有收藏文章、关注作者等权限...
技术大类 技术大类 | 数据库(mysql) | 评论(0) | 阅读(37)