mysql 行列轉換

create table tx(
id int primary key,
c1 char(2),
c2 char(2),
money int,
num int
);
 
 
 
insert into tx values
(1 ,'A1','B1',9,81),
(2 ,'A2','B1',7,53),
(3 ,'A3','B1',4,62),
(4 ,'A4','B1',2,91),
(5 ,'A1','B2',2,42),
(6 ,'A2','B2',9,66),
(7 ,'A3','B2',8,84),
(8 ,'A4','B2',5,55),
(9 ,'A1','B3',1,61),
(10 ,'A2','B3',8,43),
(11 ,'A3','B3',8,64),
(12 ,'A4','B3',6,72),
(13 ,'A1','B4',8,33),
(14 ,'A2','B4',2,24),
(15 ,'A3','B4',6,76),
(16 ,'A4','B4',9,51),
(17 ,'A1','B4',3,30),
(18 ,'A2','B4',5,26),
(19 ,'A3','B4',2,15),
(20 ,'A4','B4',5,11);
 
/*第一種靜態列*/
select ifnull(c1,'total'),
     sum(if(c2='B1',money,0)) AS B1money,
     sum(if(c2='B1',num,0)) AS B1num,
     sum(if(c2='B2',money,0)) AS B2money,
     sum(if(c2='B2',num,0)) AS B2num,
     sum(if(c2='B3',money,0)) AS B3money,
     sum(if(c2='B3',num,0)) AS B3num,
     sum(if(c2='B4',money,0)) AS B4money,
     sum(if(c2='B4',num,0)) AS B4num,
     SUM(money) AS TOTAL,
     SUM(num) AS TOTAL
     from tx
     group by c1 with rollup ;
 
 
 
/*第二種動態列*/
 
SET @EE='';
 
SELECT @EE :=CONCAT(
@EE ,
'SUM(IF(C2=\'',C2,'\'',
',money,0)) AS ',
C2,
'money,',
'SUM(IF(C2=\'',C2,'\'',
',num,0)) AS ',
C2,
'num,') FROM (SELECT DISTINCT C2 FROM TX) A;
 
SET @QQ=CONCAT('SELECT ifnull(c1,\'total\'),',LEFT( @EE ,LENGTH(@EE)-1),' ,SUM(money) AS moneyTOTAL,SUM(num) AS numTOTAL FROM
 
TX GROUP BY C1 WITH ROLLUP');
 
PREPARE stmt2 FROM @QQ ;   EXECUTE stmt2; 做者 腳丫