mysql中怎么实现行列转换操作

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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);
 

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 ;
 
 
 

 
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;

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