mysql 行列动态转换的实现(列联表,交叉表)

Thadea ·

更新时间:2024-11-13

· 705 次阅读

（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软件开发网。

您可能感兴趣的文章:mysql嵌套查询和联表查询优化方法MySQL中联表更新与删除的语法介绍mysql删除关联表的实操方法MySQL联表查询的简单示例

交叉表列联表交叉动态 Mysql

1024 个赞