(1)動態(tài)，適用于列不確定情況

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)第二個字段確定的情況下使用

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)第二個字段確定的情況下使用

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 ;

以上這篇mysql 行列動態(tài)轉換的實現(xiàn)(列聯(lián)表,交叉表)就是小編分享給大家的全部內容了，希望能給大家一個參考，也希望大家多多支持我們。

本文標題: mysql 行列動態(tài)轉換的實現(xiàn)(列聯(lián)表,交叉表)

本文地址: http://www.cppcns.com/shujuku/mysql/175566.html

總結

以上是生活随笔為你收集整理的mysql 行列转换 动态_mysql 行列动态转换的实现(列联表,交叉表)的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網(wǎng)站內容還不錯，歡迎將生活随笔推薦給好友。