mysql行列動態轉換的實現(列聯表,交叉表)

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mysql行列動態轉換的實現(列聯表,交叉表)

mysql行列動態轉換的實現(列聯表,交叉表):（1）動態，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), (

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導讀mysql行列動態轉換的實現(列聯表,交叉表):（1）動態，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), (

（1）動態，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 ;

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