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mysql 行列動態(tài)轉(zhuǎn)換的實現(xiàn)(列聯(lián)表,交叉表)

更新時間：2017年01月03日 10:43:48 投稿：jingxian

下面小編就為大家?guī)硪黄猰ysql 行列動態(tài)轉(zhuǎn)換的實現(xiàn)(列聯(lián)表,交叉表)。小編覺得挺不錯的，現(xiàn)在就分享給大家，也給大家做個參考。一起跟隨小編過來看看吧

（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(zhuǎn)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(nèi)容了，希望能給大家一個參考，也希望大家多多支持腳本之家。

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